Welding Safety Test 2019-20
Welding is the process of joining materials – usually metals or thermoplastics – by causing fusion, a method of metal-joining technique that involves melting the base metal. Must pass the test with a 80% or better to enter the shop.
Questions and Answers
- 1.
Potential hazards relating to arc welding are
- A.
Radiation
- B.
Fumes
- C.
Toxic gases
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
The potential hazards relating to arc welding include radiation, fumes, and toxic gases. Radiation can be emitted during the welding process, which can be harmful to the eyes and skin if proper protective measures are not taken. Fumes generated during welding can contain various toxic substances, such as metal oxides and gases, which can cause respiratory issues and other health problems. Additionally, certain welding processes can produce toxic gases, such as carbon monoxide and nitrogen dioxide, which can be hazardous if inhaled. Therefore, all of the above options are correct in identifying the potential hazards of arc welding.Rate this question:
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- 2.
When using a fire extinguisher to extinguish a fire, it should be
- A.
Pointed at the base of the fire
- B.
Moved up and down to cool the flames
- C.
Pointed at the top of the fire
- D.
Held within six (6) inches of the flames
Correct Answer
A. Pointed at the base of the fireExplanation
When using a fire extinguisher to extinguish a fire, it should be pointed at the base of the fire because this is where the fuel source is located. By directing the extinguisher at the base, it helps to cut off the supply of fuel and effectively put out the fire. Pointing at the top of the fire or holding it within six inches of the flames may not be as effective as it does not target the source of the fire. Moving the extinguisher up and down to cool the flames may help in some cases, but it is still important to aim at the base to fully extinguish the fire.Rate this question:
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- 3.
What type of fire extinguisher should be used on electrical fires?
- A.
Type A
- B.
Type B
- C.
TypeC
- D.
Type D
Correct Answer
C. TypeCExplanation
Type C fire extinguishers should be used on electrical fires. This type of extinguisher is specifically designed to extinguish fires involving electrical equipment such as wiring, circuit breakers, and outlets. Type C extinguishers contain non-conductive extinguishing agents, such as dry chemical powder or carbon dioxide, which do not conduct electricity and therefore can safely be used on electrical fires. Using the correct type of fire extinguisher is crucial to effectively and safely extinguish different types of fires.Rate this question:
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- 4.
What are the initials of the federal organization created to insure safe and sanitary working conditions for employees?
- A.
FAA
- B.
IRS
- C.
FDA
- D.
OSHA
Correct Answer
D. OSHAExplanation
OSHA stands for Occupational Safety and Health Administration. It is a federal organization that ensures safe and sanitary working conditions for employees. OSHA sets and enforces standards, provides training, outreach, education, and assistance to employers and workers regarding workplace safety and health. It plays a crucial role in preventing workplace injuries, illnesses, and fatalities by promoting and enforcing regulations and guidelines to protect employees.Rate this question:
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- 5.
The maximum safe working pressure for Acetylene is
- A.
10 psi.
- B.
15 psi.
- C.
20 psi.
- D.
32 psi.
Correct Answer
B. 15 psi.Explanation
Acetylene is a highly flammable gas and therefore has a lower maximum safe working pressure compared to other gases. A pressure of 15 psi is considered safe for handling and storage of acetylene. Higher pressures can increase the risk of explosion and fire hazards.Rate this question:
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- 6.
Vaporized metals, such as zinc, cadmium, lead, chromium and beryllium
- A.
Are hazardous
- B.
Can be ignored
- C.
Are highly flammable
- D.
May cause slag inclusions
Correct Answer
A. Are hazardousExplanation
The given correct answer states that vaporized metals, such as zinc, cadmium, lead, chromium, and beryllium, are hazardous. This means that these metals, when in a vaporized state, pose a potential danger or risk to human health, the environment, or both. It implies that precautions should be taken when working with or around these metals to prevent any negative consequences or harm.Rate this question:
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- 7.
Fuel gas hoses are usually colored
- A.
Green
- B.
Red
- C.
Blue
- D.
Yellow
Correct Answer
B. RedExplanation
Fuel gas hoses are usually colored red because red is commonly recognized as the standard color for identifying fuel-related equipment. This color coding system helps to prevent confusion and ensure safety in various industries where fuel gases are used. Red hoses indicate that they are specifically designed for fuel gas applications, making it easier for workers to identify and handle them correctly.Rate this question:
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- 8.
Flash burn is
- A.
Another name for a severe sunburn
- B.
A burn caused by the welding arc coming in contact with bare skin
- C.
A burn to the eye caused by exposure to ultraviolet light from the welding arc
- D.
Damage to equipment and clothing due to the extreme heat of the welding arc
Correct Answer
C. A burn to the eye caused by exposure to ultraviolet light from the welding arcExplanation
Flash burn is a burn to the eye caused by exposure to ultraviolet light from the welding arc. When a person's eyes are not properly protected while welding, the intense UV light emitted by the welding arc can damage the surface of the eye, leading to a flash burn. This can cause symptoms such as pain, redness, watering of the eyes, and sensitivity to light. It is important for welders to wear appropriate protective eyewear to prevent flash burns and other eye injuries.Rate this question:
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- 9.
One should never enter a welding shop without wearing
- A.
Gloves
- B.
Safety glasses
- C.
A welding helmet
- D.
Welding leathers
Correct Answer
B. Safety glassesExplanation
Safety glasses are necessary when entering a welding shop to protect the eyes from sparks, debris, and harmful radiation emitted during the welding process. Welding produces intense light, heat, and sparks that can cause severe eye damage if proper eye protection is not worn. Therefore, safety glasses are an essential safety measure to prevent eye injuries and should always be worn in a welding shop.Rate this question:
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- 10.
What should one never use on gas cylinders, regulators, connections and hoses?
- A.
Wrenches
- B.
Teflon tape
- C.
Leak detectors
- D.
Oil
Correct Answer
D. OilExplanation
Oil should never be used on gas cylinders, regulators, connections, and hoses because oil is flammable and can increase the risk of fire or explosion. Additionally, oil can degrade the materials used in these components, leading to leaks or other failures. It is important to use appropriate lubricants and sealants that are specifically designed for use with gas systems to ensure safety and proper functioning.Rate this question:
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- 11.
One should never cut or weld directly against
- A.
Cast iron
- B.
Concrete
- C.
A workbench
- D.
A non-flammable surface
Correct Answer
B. ConcreteExplanation
Cutting or welding directly against concrete can be dangerous because it can cause the concrete to crack or explode. Concrete is a brittle material that can shatter under intense heat or pressure. Additionally, concrete contains moisture which can turn into steam when exposed to high temperatures, further increasing the risk of an explosion. Therefore, it is important to avoid cutting or welding directly against concrete to prevent accidents and ensure safety.Rate this question:
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- 12.
One should never operate arc welding equipment while
- A.
Standing on wet or damp floors
- B.
In poorly lighted areas
- C.
Someone is standing near by
- D.
In a confined area with proper ventilation
Correct Answer
A. Standing on wet or damp floorsExplanation
Operating arc welding equipment while standing on wet or damp floors is dangerous because water is a good conductor of electricity. If the floors are wet or damp, there is a higher risk of electrical shock or electrocution. Water can create a path for electricity to flow through the body, resulting in severe injuries or even death. Therefore, it is crucial to ensure a dry and safe working environment when using arc welding equipment.Rate this question:
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- 13.
A burn that causes the skin to blister is referred to as a
- A.
First degree burn
- B.
Second degree burn
- C.
Third degree burn
- D.
Fourth degree burn
Correct Answer
B. Second degree burnExplanation
A burn that causes the skin to blister is referred to as a second degree burn. This type of burn affects the epidermis and the dermis layers of the skin. It is characterized by redness, pain, swelling, and the formation of blisters. Unlike a first degree burn, which only affects the outermost layer of the skin, a second degree burn penetrates deeper into the skin. It is important to seek medical attention for second degree burns to prevent infection and promote proper healing.Rate this question:
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- 14.
Federal regulation requires that hazardous information about a product be provided to all users of that product. The form used to provide this information is called a(n)
- A.
Information Form (IF)
- B.
Hazardous Information Sheet (HIS)
- C.
Occupational Safety and Hazard Form (OSHF)
- D.
Material Safety Data Sheet (MSDS)
Correct Answer
D. Material Safety Data Sheet (MSDS)Explanation
Federal regulation requires that hazardous information about a product be provided to all users of that product. The form used to provide this information is called a Material Safety Data Sheet (MSDS). This document contains detailed information about the potential hazards of a product, including its chemical composition, physical properties, and proper handling procedures. It is important for users to have access to this information in order to safely handle and use hazardous products. The other options, such as Information Form (IF), Hazardous Information Sheet (HIS), and Occupational Safety and Hazard Form (OSHF), do not accurately describe the specific form required by federal regulation.Rate this question:
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- 15.
Which of the following is the only acceptable method for lighting oxyfuel torches?
- A.
Matches
- B.
Cigarette lighter
- C.
Welding arc
- D.
Striker
Correct Answer
D. StrikerExplanation
The only acceptable method for lighting oxyfuel torches is by using a striker. A striker is a tool that produces sparks when struck against a rough surface, such as flint. These sparks are used to ignite the fuel gas and create a flame in the torch. Matches and a cigarette lighter are not suitable for lighting oxyfuel torches as they may not provide a consistent and controlled ignition source. Similarly, a welding arc is not used for lighting oxyfuel torches as it is a completely different process used for welding and cutting metals.Rate this question:
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- 16.
Areas that have less than__________ cubic feet per welder, or that have ceilings less than 16 feet high, require forced ventilation.
- A.
8,000
- B.
4,000
- C.
10,000
- D.
12,000
Correct Answer
D. 12,000Explanation
Areas that have less than 12,000 cubic feet per welder, or that have ceilings less than 16 feet high, require forced ventilation. This means that if the area has a lower cubic feet per welder value or a ceiling height below 16 feet, it is necessary to have forced ventilation in order to maintain a safe and healthy environment for the welders.Rate this question:
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- 17.
While welding, ventilation should be placed as close to the fume source as practical.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The statement is true because placing ventilation as close to the fume source as possible helps to effectively remove and disperse the fumes generated during welding. This reduces the concentration of harmful fumes in the surrounding air, minimizing the risk of inhalation by the welder and others nearby. By positioning the ventilation close to the fume source, it ensures that the fumes are captured and extracted efficiently, creating a safer working environment.Rate this question:
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- 18.
Because of the low amount of ultraviolet light present, it is not necessary to use shaded lenses when oxy-fuel cutting.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement suggests that shaded lenses are not necessary when oxy-fuel cutting due to the low amount of ultraviolet light present. However, this is incorrect. Oxy-fuel cutting produces a significant amount of ultraviolet light, which can be harmful to the eyes. Therefore, it is necessary to use shaded lenses for eye protection during oxy-fuel cutting.Rate this question:
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- 19.
Long hair, loose-fitting clothes, and ties are personal safety hazards around rotating equipment.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Long hair, loose-fitting clothes, and ties can easily get caught in rotating equipment, posing a serious risk of injury. When hair or clothing gets entangled in machinery, it can result in severe injuries such as scalp or limb lacerations, fractures, or even amputations. Therefore, it is important to avoid wearing long hair, loose-fitting clothes, and ties while working around rotating equipment to ensure personal safety.Rate this question:
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- 20.
A butane or propane cigarette lighter is safe around welding equipment as long as it is kept in one's pocket.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Keeping a butane or propane cigarette lighter in one's pocket around welding equipment is not safe. Lighters that use flammable gases like butane or propane can pose a fire hazard in the presence of sparks or open flames from welding equipment. It is important to keep such lighters away from any potential ignition sources to prevent accidents or fires.Rate this question:
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- 21.
A fully charged oxygen cylinder contains approximately 225 psi at 70° F.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
A fully charged oxygen cylinder does not contain approximately 225 psi at 70°F.Rate this question:
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- 22.
Safety glasses are not required when welding with the helmet down.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Safety glasses are not required when welding with the helmet down. This statement is false. Safety glasses are an essential safety precaution when welding, even with the helmet down. They provide additional protection for the eyes from sparks, debris, and harmful UV radiation. Welding can create intense light and heat, which can cause eye damage if proper eye protection is not worn. Therefore, safety glasses should always be worn in addition to a welding helmet to ensure maximum safety.Rate this question:
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- 23.
Skin contact with liquid oxygen can cause frostbite.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Skin contact with liquid oxygen can cause frostbite because liquid oxygen is extremely cold, with a boiling point of -183 degrees Celsius (-297 degrees Fahrenheit). When liquid oxygen comes into contact with skin, it rapidly evaporates and absorbs heat from the surrounding tissue, causing freezing and damage to the skin. This can result in frostbite, which is a condition where the skin and underlying tissues freeze, leading to pain, numbness, and potentially severe tissue damage. Therefore, the statement that skin contact with liquid oxygen can cause frostbite is true.Rate this question:
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- 24.
Gas cylinders must be chained or secured at all times.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Gas cylinders must be chained or secured at all times to prevent them from falling over or being knocked over, which could result in a dangerous gas leak or explosion. This is especially important in areas where there is a risk of heavy machinery or vehicles coming into contact with the cylinders. By chaining or securing the cylinders, they are kept in a stable position and are less likely to cause harm or damage.Rate this question:
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- 25.
Oxygen cylinders should never be stored with flammable gases such as acetylene cylinders.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Oxygen cylinders should never be stored with flammable gases such as acetylene cylinders because oxygen supports combustion and can accelerate the burning process. If a leak or ignition were to occur in the vicinity of the oxygen cylinder, it could lead to a dangerous explosion or fire. Therefore, it is crucial to store oxygen cylinders separately from flammable gases to ensure the safety of the environment and individuals nearby.Rate this question:
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- 26.
When not in use, an electrode holder, GTAW torch or MIG gun should not be placed in contact with a grounded metal surface.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
When not in use, an electrode holder, GTAW torch, or MIG gun should not be placed in contact with a grounded metal surface because it can cause a short circuit or electrical shock. Grounding is a safety measure to prevent electrical accidents, and placing these tools in contact with a grounded metal surface can bypass this safety measure and create a dangerous situation. Therefore, it is important to ensure that these tools are properly stored and kept away from any grounded metal surfaces when not in use.Rate this question:
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- 27.
Acetylene cylinders should never be operated while lying on their side because acetone could be drawn into the valve, regulator and hoses.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Acetylene cylinders should never be operated while lying on their side because when the cylinder is on its side, there is a possibility for acetone, which is used as a solvent and stabilizer in acetylene cylinders, to be drawn into the valve, regulator, and hoses. This can cause damage to the equipment and potentially lead to hazardous situations. Therefore, it is important to always keep acetylene cylinders in an upright position during operation.Rate this question:
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- 28.
One should never touch an electrode to a metal surface other than the workpiece because those surfaces may become electrically live.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Touching an electrode to a metal surface other than the workpiece can cause that surface to become electrically live. This is because the electrode is connected to a power source, and if it comes into contact with another metal surface, it can create a circuit and pass electrical current through that surface. This can be dangerous and potentially cause electric shock or other electrical hazards. Therefore, it is important to only touch the electrode to the workpiece to ensure safe welding practices.Rate this question:
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- 29.
Burns are some of the most common and painful injuries in a welding shop.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Burns are indeed some of the most common and painful injuries in a welding shop. This is because welding involves working with high temperatures, sparks, and molten metal, which can easily cause burns if proper safety precautions are not followed. Welders are at risk of getting burns from direct contact with hot materials, as well as from sparks and splatter. These burns can range from mild to severe, causing pain, blistering, and even permanent scarring. Therefore, it is important for welders to wear appropriate protective clothing and follow safety guidelines to prevent these types of injuries.Rate this question:
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- 30.
Fuel gas fittings are equipped with left hand threads.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Fuel gas fittings are equipped with left hand threads because left hand threads are designed to resist loosening caused by the rotation of the fitting during use. This is important for fuel gas fittings as they are subjected to high pressure and vibration, which can cause traditional right hand threads to loosen over time. Left hand threads provide a more secure and reliable connection, ensuring that the fitting remains tight and leak-free.Rate this question:
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- 31.
Of the following, which is not a requirement for the SMAW process?
- A.
Electricity
- B.
Gas supply
- C.
Base metal
- D.
Filler metal
Correct Answer
B. Gas supplyExplanation
The SMAW (Shielded Metal Arc Welding) process does not require a gas supply. It uses a flux-coated electrode to create the arc and shield the weld pool from the surrounding atmosphere. The flux coating provides the necessary protection, eliminating the need for an external gas supply like in other welding processes such as TIG or MIG welding.Rate this question:
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- 32.
Which of the following is an incorrect statement about an E7018 electrode?
- A.
Once opened, it should be kept in an electrode oven.
- B.
The weld deposit has a minimum tensile strength of 70,000 psi.
- C.
It is suitable for use in the flat and horizontal fillet positions only.
- D.
It is suitable for use in all positions.
- E.
It is a low hydrogen electrode.
Correct Answer
C. It is suitable for use in the flat and horizontal fillet positions only.Explanation
The given incorrect statement about an E7018 electrode is that it is suitable for use in the flat and horizontal fillet positions only. In reality, the E7018 electrode is suitable for use in all positions, making it versatile for various welding applications.Rate this question:
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- 33.
Which one of the following electrodes is not suitable for use in all positions?
- A.
E6010
- B.
E6011
- C.
E7018
- D.
E7024
Correct Answer
D. E7024Explanation
The E7024 electrode is not suitable for use in all positions because it is a high iron powder electrode that produces a heavy slag. This heavy slag can make it difficult to weld in certain positions, such as overhead or vertical-down. Additionally, the E7024 electrode is designed for flat and horizontal welding, making it less versatile compared to the other options listed.Rate this question:
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- 34.
Which of the following electrodes would you select to produce a weld with shallow penetration?
- A.
E6010
- B.
E6011
- C.
E6013
- D.
E7018
Correct Answer
C. E6013Explanation
The E6013 electrode would be selected to produce a weld with shallow penetration. This electrode is known for its ease of use and versatility, making it suitable for a variety of welding applications. It produces a smooth and clean weld bead with minimal penetration, making it ideal for thin materials or situations where a shallow weld is desired.Rate this question:
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- 35.
In order to reduce waste and control cost, you should weld until the electrode is
- A.
One half inch from the core wire
- B.
Down to the core wire
- C.
Four (4) inches form the core wire
- D.
Down to the classification numbers
Correct Answer
D. Down to the classification numbersExplanation
The correct answer is "down to the classification numbers." This means that you should weld until the electrode is at the level of the classification numbers. This is important in order to ensure proper welding and to maintain quality control. Welding beyond this point may result in unnecessary waste and increased costs.Rate this question:
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- 36.
GMAW is the abbreviation for?
- A.
Gas Machine Arc Welding
- B.
Gas Method Arc Welding
- C.
Gas Material Arc Welding
- D.
Gas Metal Arc Welding
Correct Answer
D. Gas Metal Arc WeldingExplanation
GMAW stands for Gas Metal Arc Welding. This process involves using a continuous solid wire electrode, which is fed through a welding gun and combined with a shielding gas to create an electric arc. The arc melts the wire and the base metal, creating a weld. This method is commonly used in industries such as automotive, construction, and manufacturing due to its versatility and ability to produce high-quality welds.Rate this question:
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- 37.
In GMAW, insufficient gas flow can cause?
- A.
Undercut
- B.
Overlap
- C.
Porosity
- D.
Hydrogen cracking
Correct Answer
C. PorosityExplanation
Insufficient gas flow in GMAW (Gas Metal Arc Welding) can cause porosity. Porosity refers to the presence of small gas pockets or voids in the weld metal, which weakens the weld and reduces its integrity. When there is not enough shielding gas flowing over the weld pool, it fails to protect the molten metal from atmospheric contamination. This leads to the entrapment of gases, such as oxygen and nitrogen, in the weld, resulting in porosity.Rate this question:
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- 38.
The benefit of copper coated electrode wires is
- A.
Better arc starts
- B.
Increased contact tip life
- C.
Improved wire feeding
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
Copper coated electrode wires offer several benefits. Firstly, they provide better arc starts, ensuring a smooth and stable welding process. Secondly, the copper coating helps to increase the lifespan of the contact tip, reducing the need for frequent replacements. Lastly, the copper coating also improves wire feeding, ensuring a consistent and reliable wire feed rate. Therefore, the correct answer is "all of the above".Rate this question:
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- 39.
In GMAW, the amperage is controlled by adjusting the
- A.
Voltage
- B.
Wire feed speed
- C.
Wattage
- D.
Arc length
Correct Answer
B. Wire feed speedExplanation
In GMAW (Gas Metal Arc Welding), the amperage is controlled by adjusting the wire feed speed. This is because the wire feed speed determines the amount of filler metal being deposited into the weld joint per unit of time. By increasing or decreasing the wire feed speed, the amperage can be adjusted accordingly. A higher wire feed speed will result in a higher amperage, while a lower wire feed speed will result in a lower amperage. Therefore, controlling the wire feed speed allows for precise control over the amperage in GMAW.Rate this question:
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- 40.
Which of the following is considered an advantage of the GMAW process?
- A.
Higher deposition rates than manual processes
- B.
Easy to use compared to manual processes
- C.
Less electrode waste than with SMAW
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
The GMAW process, also known as Gas Metal Arc Welding or MIG welding, offers several advantages. Firstly, it provides higher deposition rates compared to manual processes, meaning that more material can be welded in a shorter amount of time. Secondly, it is easier to use compared to manual processes, making it more accessible for welders of different skill levels. Lastly, GMAW results in less electrode waste than Shielded Metal Arc Welding (SMAW) because it uses a wire electrode that is consumed during the welding process, whereas SMAW uses a coated electrode that is mostly wasted. Therefore, all of the given options are considered advantages of the GMAW process.Rate this question:
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- 41.
Excessive amounts of weld spatter in the nozzle may cause
- A.
Lack of fusion
- B.
Undercutting
- C.
Poor shielding
- D.
Longitudinal cracks
Correct Answer
C. Poor shieldingExplanation
Excessive amounts of weld spatter in the nozzle may cause poor shielding. When there is an abundance of weld spatter, it can obstruct the flow of shielding gas, resulting in inadequate protection of the weld pool. This can lead to various issues such as lack of fusion, undercutting, and longitudinal cracks. Without proper shielding, the weld may not achieve the desired strength and integrity, compromising the quality of the weld joint.Rate this question:
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- 42.
Which of the following is not an advantage of the GMAW process?
- A.
Higher deposition rates
- B.
Relatively easy process for a beginner to learn
- C.
Can be used to weld ferrous and nonferrous metals
- D.
Good for use in windy areas
Correct Answer
D. Good for use in windy areasExplanation
The GMAW process, also known as MIG welding, offers several advantages such as higher deposition rates, being a relatively easy process for beginners to learn, and the ability to weld both ferrous and nonferrous metals. However, it is not advantageous for use in windy areas. Wind can disrupt the shielding gas, which is essential in protecting the weld pool from atmospheric contamination. This can lead to poor weld quality and potential defects. Therefore, the GMAW process is not recommended for use in windy conditions.Rate this question:
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- 43.
Which shielding gas or gas mixture is most often used for welding carbon steel with the short-circuiting transfer mode?
- A.
100% Argon
- B.
10% Carbon dioxide, 90% Helium
- C.
98% Argon, 2% Oxygen
- D.
75% Argon, 25% Carbon Dioxide
Correct Answer
D. 75% Argon, 25% Carbon DioxideExplanation
The most commonly used shielding gas or gas mixture for welding carbon steel with the short-circuiting transfer mode is 75% Argon and 25% Carbon Dioxide. This mixture provides good arc stability, improved weld penetration, and reduced spatter. Argon helps to stabilize the arc, while carbon dioxide enhances the weld penetration. The combination of these gases is ideal for achieving high-quality welds on carbon steel using the short-circuiting transfer mode.Rate this question:
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- 44.
When using GTAW to weld Aluminum with Alternating Current (AC), the tip of the tungsten electrode should be
- A.
Tapered
- B.
Tapered with the end slightly blunted
- C.
Rounded at the tip
- D.
Ground at right angles to the grain of the electrode
Correct Answer
C. Rounded at the tipExplanation
When using GTAW to weld Aluminum with Alternating Current (AC), the tip of the tungsten electrode should be rounded at the tip. This is because a rounded tip helps to produce a stable and focused arc, which is important for achieving a high-quality weld. The rounded tip also helps to prevent the electrode from sticking to the workpiece and allows for better control of the weld puddle.Rate this question:
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- 45.
The shielding gas most commonly used for welding low carbon steel with GTAW is
- A.
Carbon Dioxide
- B.
Argon
- C.
Helium
- D.
A mix of Argon and Helium
Correct Answer
B. ArgonExplanation
Argon is the most commonly used shielding gas for welding low carbon steel with GTAW (Gas Tungsten Arc Welding). Argon is preferred because it provides excellent arc stability, good penetration, and minimal spatter. It also helps to protect the weld from atmospheric contamination and oxidation. Carbon Dioxide, Helium, and a mix of Argon and Helium can also be used as shielding gases for different applications, but Argon is the most commonly used gas for welding low carbon steel.Rate this question:
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- 46.
To remove the oxide layer from aluminum prior to welding you should
- A.
Brush the weld joint with a steel brush
- B.
Brush the weld joint with a stainless steel brush
- C.
Wipe the weld joint with a dry, clean rag
- D.
Aluminum oxides normally do not require removal
Correct Answer
B. Brush the weld joint with a stainless steel brushExplanation
Brushing the weld joint with a stainless steel brush is the correct answer because stainless steel brushes are effective in removing the oxide layer from aluminum. Aluminum oxide forms on the surface of aluminum when it is exposed to oxygen, and this oxide layer can interfere with the welding process. Stainless steel brushes are preferred for this task because they are less likely to contaminate the aluminum surface with iron particles, which could cause further issues during welding. By brushing the weld joint with a stainless steel brush, the oxide layer is removed, ensuring a clean surface for successful welding.Rate this question:
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- 47.
Tungsten is used for GTAW electrodes because it has which of the following properties?
- A.
High melting point
- B.
Low electrical resistance
- C.
Good heat conductivity
- D.
High electron emission
- E.
All of the above
Correct Answer
A. High melting pointExplanation
Tungsten is used for GTAW electrodes because it has a high melting point. This property is crucial for welding applications as it allows the electrode to withstand the high temperatures generated during the welding process without melting or deteriorating. The other properties mentioned, such as low electrical resistance, good heat conductivity, and high electron emission, are not specific to tungsten and are not the primary reasons for its use as GTAW electrodes.Rate this question:
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- 48.
What is the term for the width of the cut produced by any cutting process?
- A.
Drag line
- B.
Kerf
- C.
Wraparound
- D.
Slag
Correct Answer
B. KerfExplanation
The term for the width of the cut produced by any cutting process is called "kerf". Kerf refers to the material that is removed during the cutting process, resulting in a gap or width in the cut. This term is commonly used in various cutting processes such as woodworking, metalworking, and laser cutting. The width of the kerf is an important factor to consider in order to achieve accurate and precise cuts.Rate this question:
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- 49.
Which oxyacetylene flame has an excess of fuel?
- A.
Oxidizing
- B.
Neutral
- C.
Carburizing
- D.
None of the above
Correct Answer
C. CarburizingExplanation
A carburizing flame has an excess of fuel. Carburizing is a process in which carbon is introduced into the surface of a material to increase its hardness. In an oxyacetylene flame, the carburizing flame is achieved by increasing the acetylene gas flow while keeping the oxygen flow constant. This results in a fuel-rich flame with a high concentration of carbon, which is necessary for the carburizing process. The excess fuel in the carburizing flame helps to provide the carbon needed for the surface hardening of the material.Rate this question:
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- 50.
The oxyfuel process uses oxygen and what other types of gases?
- A.
Inert Gases
- B.
Reactive Gases
- C.
Mixed gases
- D.
Flammable gases
Correct Answer
D. Flammable gasesExplanation
The oxyfuel process involves the use of oxygen along with flammable gases. This combination of gases is used in various industrial processes such as cutting, welding, and heating. The oxygen helps in supporting the combustion of the flammable gases, resulting in high temperatures that are necessary for these processes. The use of flammable gases in the oxyfuel process allows for efficient and controlled heating, making it a widely used technique in industries.Rate this question:
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Current Version
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Dec 11, 2023Quiz Edited by
ProProfs Editorial Team -
Sep 04, 2018Quiz Created by
Matt Gines
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