Welding Test Questions And Answers

14 Questions | By Houseboatbilly | Updated: Mar 22, 2022 | Attempts: 55116

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Check out our interesting welding test questions and answers quiz that is designed to test your basic welding knowledge. This is approximate to Certificate II level in trades such as Boilermaking or Fabricating. So, answer these 14 questions about the same by selecting the most appropriate answer.

Questions and Answers

1.

What is an "inert gas" as used in Metal Inert Gas (MIG) Welding?
- A.
  
  A gas that cools the weld zone to prevent cracking.
- B.
  
  A gas that prevents porosity by burning a hot neutral flame.
- C.
  
  A gas that does not chemically react with other elements to help produce a quality weld.
- D.
  
  A gas that heats up the weld zone to create a better quality weld.
2.

Stick (Arc) Welding uses a coated electrode, what is the purpose of this coating?
- A.
  
  The coating insulates the welder from electric shocks.
- B.
  
  The coating helps clean the weld zone from contaminates such as rust or paint.
- C.
  
  The coating prevents water from damaging the electrode.
- D.
  
  The coating produces a protective gas to prevent porosity.
3.

Which weld procedure is safe to perform in wet conditions?
- A.
  
  Oxy Welding
- B.
  
  Arc Welding
- C.
  
  MIG Welding
- D.
  
  TIG Welding
4.

What is the minimum recommended filter shade on a welding helmet to protect your eyes?
- A.
  
  Shade 10
- B.
  
  Shade 13
- C.
  
  Shade 5
- D.
  
  Clear lens
5.

What type of respiratory protection is the minimum required when welding?
- A.
  
  Dust mask
- B.
  
  P2 Respirator
- C.
  
  No protection is required
- D.
  
  Hazmat suit
6.

How would you prepare heavily rusted mild steel for welding?
- A.
  
  Wash with soap and water.
- B.
  
  Grind back to bare metal.
- C.
  
  Nothing, I would weld over it.
- D.
  
  Give it a light sand with 240 grit sandpaper.
7.

What type of weld would you do to form a T shape between two pieces of flat bar?
- A.
  
  Butt
- B.
  
  Fillet
- C.
  
  Edge
- D.
  
  Outside Corner
8.

Which of the following is an advantage of MIG welding.
- A.
  
  It works well in the wind.
- B.
  
  You can safely weld in wet conditions with it.
- C.
  
  It takes less operator skill than other weld types.
- D.
  
  It is slow and accurate which is good for very thin metal.
9.

How would you prepare 25mm low carbon steel flat bar for a butt weld?
- A.
  
  Give it a quick grind to make sure the metal is clean
- B.
  
  Grind a single bevel preparation
- C.
  
  Nothing
- D.
  
  Grind a double V preparation
10.

What two items on a MIG welder would need to be changed when changing from 0.9mm mild steel wire electrode to 1.2mm mild steel wire electrode?
- A.
  
  Contact tip and shroud.
- B.
  
  Contact tip and drive rollers.
- C.
  
  Gas diffuser and drive rollers.
- D.
  
  Gas bottle and earth clamp.
11.

What treatment is recommended after welding stainless steel?
- A.
  
  No treatment required for stainless.
- B.
  
  Quench in water to remove oxides.
- C.
  
  Apply pickling paste.
- D.
  
  Oil to stop rust
12.

When performing a fillet weld between two pieces of 5mm thick mild steel, what is the recommended size (leg length) of the weld? (when not given a size)
- A.
  
  5mm
- B.
  
  10mm
- C.
  
  7.5mm
- D.
  
  3mm
13.

If you found a tool to be faulty or dangerous what should you do?
- A.
  
  Put it back in the store.
- B.
  
  Only use it one more time, then get it fixed.
- C.
  
  Take it out of service, report it and if required, tag it.
- D.
  
  Do nothing
14.

Why shouldn't you wear nylon clothing when welding?
- A.
  
  Because you will get too sweaty.
- B.
  
  It is fine to wear.
- C.
  
  Because static electricity can build up cause shocks.
- D.
  
  Because it can catch fire easily and melt to your skin.