CSWIP 3.1 PART 4

1. What is the ratio between the leg length and design throat thickness on mitre fillet weld with equal leg lengths?

1 to 1

2 to 1

1.414 to 1

All of the above it depend upon the leg length size

2. In steel the element with the greatest effect on hardness is :

Chromium

Manganese

Carbon

Nickel

3. You notice TIG welding being carried out using MMA electrode striped of flux being used as filler wires .you would certainly report this issue and file a non-conformance report .what would the main reson why?

Because of the additional cost incurred

The wire would have been too thick

Weld metals composition would be incorrect

The welder would not be qualified

4. The main reason for grinding the capping passes flush is:

To increase fatigue life

To increase the chances of fatigue cracking

To improve visual appearance

To reduce the components weight

5. In an all weld metal tensile test, the original test specimens gauge length of 50mm after testing the gauge increased to 72mm, what is the elongation percentage?

44%

144%

69.4%

2.27%

The elongation is not normally tested in this test

6. Which of following would be considered a typical heat input reading with the MIG/MAG welding process?

1.2KJ/mm

12KJ/mm

1.2 Joules /mm

6.5 KJ/mm

7. When considering the tungsten arc welding process what is the purpose of the down-slope (slope -out)control?

Ensure good penetration

To prevent the arc striking on the parent material

To help prevent the formation of crater pipe and possible cracking

To help prevent tungstan inclusion during welding

8. You are the only welding inspection on a cross country gas supply pipline project .which of the following welding /fabrication stages would you consider the most important stage for your closest scrutiny?

Fit-up and root pass welding

Post weld cleaning

Fillers and capping pass welding

Radiography

9. The inclusion the rate an inductance in the welding circuit when using MIG/MAG welding process is to :

Control the rate of spatter in the dip transfer mode

It enable the welder to weld in position with the spray transfer mode

It allows for thicker filler wires to be used(2.6-3.6mm diameter)

It allow full control over droplet size in the spray transfer mode

10. When considering hydrogen,which of the following welding process would produce the lowest levels in the completed weld (under controlled conditions)?

MMA

SAW

TIG

FCAW

11. Which of the following current types would you expect to be used for the welding of aluminium with the TIG welding process?

DC-ve

DC+ve

AC

All of the above

12. What is the arc enegy for the following welding process parameters?

0.7 KJ/mm

0.6KJ/mm

0.01KJ/mm

0.7KJ/mm

13. The main usage of the arc air process is :

The cutting of a weld preparation

The removal of defective weld

For the cutting of non-ferrous materials only

For the cutting of ferrous materials only

14. In a sami-automatic wlding process, which of the following shielding gas/gas mixtures would normally give the deepest penetration on steel?

100% argon

100% CO2

75% argon +25% CO2

All of the above would give the same depth in penetration

15. Duplex stainless steel can be somtimes referred to as:

Martensitic stainless steel

Ferritic/austenitic stainless steel

316L stainless steel

All of the above

16. The number 135 is placed at the end of the reference line on a weld symbol.according to ISO 2553 what does number indicate?

The welding process is stated as MMA

The welding process is stated as TIG

The welding process is stated as SAW

NDT is to e carried out after welding

None of the above

17. The toughness and yield strength of steel is reduced by:

Reducing the grain size

Increasing the heat input

Reducing the heat input

Both a and b

18. When considering thermal cutting local hardening can be reduced by:

Increasing the cutting speed

The use propane as a fuel gas

Pre heating the material to be cut

All of the above

19. Weld center line longitudinal cracks in welded butt joints may have resulted from which of the following ?

Solidification problems

Hydrogen entrapment

Poor welder skill

Both a and b

20. During the visual inspection of a fillet weld with even lengths of 15mm.the throat thickness is measured at 8.5mm,what is the fillet welds profile?

Convex

Mitre

Concave

Both a and b

21. Which of the following us the best why to identify hydrogen controlled electrodes for the MMAwelding process?

The colour of the flux covering

The electrodes classification code on box

The electrodes classification code on stamped on to the electrode

The electrode trade/manufacturers name

All of the above

22. Haw can you tell the diffrence between an EN/ISO weld symbol and a BS weld symbol?

The EN/ISO weld symbol will always have the arrow side weld at the top of the reference line

The EN/ISO weld symbol has a fillet weld leg length identified by the letter "a"

The EN/ISO weld symbol has a fillet weld throat thickness identified by the letter "z"

Both b and d

23. Wihich of the following under typical conditions using the MMA welding process would give the deepest penetration?

DC-ve

DC+ve

AC

Both a and b

24. What is the possible effect of having the heat input too low during welding?

Low toughness,entrapped hydrogen and low hardness

High hardness,lack of fusion and entrapped hydrogen

Entrapped hydrogen ,low toughness and high ductility

Lack of fusion ,low toughness and reduction in ductility

25. which of following welding parameters are the most difficult to control during the welding operation using a manual arc welding process?

Travel speed

Voltage

Current

Arc length

26. An undesirable property of aluminium oxide residue ,when welding is that it:

Decreases weld pool fluidity

Requires more heat to melt it when compared to aluminium

Causes the welder to travel to quickly

The presence of the oxide makes aluminium impossible to weld

27. Which of the following best describes a sami-autimatic welding process?

The welder is responsible for the maintaining the arc gap and travel speed

The welder is responsible for travel speed only;arc gap is kept constant by the welding plant

Both travel speed and arc gap is controlled by the welding plant

All of above

28. What is purpose of rectifier in welding sets electrical circuit?

To keep the arc stable when using low current settings

To convert AC current to DC current

To convert DC current to AC current

To initiate arc at start up

29. Wich of the following is the most likely to be considered an essential variable for a welde qualification test?

A change of pipe wall thickness by at least 15 mm

A change in pre-heat temperature from 50°C to 100°C

A change from PC welding position to PA welding position

All of the above

30. When calibrating a mechanised MAG welding plant ,which of the following applies(WFS=wire feed speed)?

Check- WFS,current ,volts and wire diameter

Check- WFS,joint set-up ,gas flow rate and WFS

Check- gas flow rate,stick out length,WFS and current

All of the above

31. What would be a typical appearance of a dutile fracture surface?

Rough randomly torn and a reduction in area

Smooth fracture surface displaying beach marks

Step like appearance

Bright crystalline fracture with very little reduction in area

Both a and b

32. When welding with the MIG welding process using pure argon as the sheilding gas on carbon steel ,which of the following problems are likely to occur?

Copper inclusion and excessive cap heights

Excessive root penetration and porosity

Slag inclusion and crater pipe

Lack of fusion and poor cap profiles

33. Which of following fillet welded tee joints would have the highest resistance to fatigue fractures ,assuming material ,welding process ,filler material to be the same?

A convex fillet weld throat thickness 8mm

A mitre fillet weld throat thickness 8mm

A concave fillet weld throat thickness 6mm

Both a and b (throat thicknesses dimension the same)

34. When considering the MIG/MAG welding process which of the following metal transfer modes would be the best suited to the welding of thick plates over 25mm,flat welding position :

Dip transfer

Pulse transfer

Spray transfer

Globular transfer

35. Which of the following statments is true if applicable to a charpy vee notch impact test?

It's destructive test used to assess material ductility in the weld zone

It's a mechanical test used to determine a welds resistance to creep

It's destructive test, which is used to give a measure of notch toughness

It's a static test used to determine material toughness in the notch region

Both a and c

36. For a given voltage and current setting on a MMA welding plant, when the arc length is shortend , which of the will be most affected?

The current will increase

The current will decrease

The voltage will decrease

The voltage will increase

37. An MMA electrode classified as E7018 is :

A basic low hydrogen electrode containing iron powder

A rutile electrode containing iron powder

A cellulose electrode suitable for welding in all positions

A basic electrode depositing weld metal with yield strength af a least 70,000 psi

Both a and d

38. In a MMA weldig process,which of following statments are false?

An arc gap,which remains almost constant even if as usual the welder varies the position of the electrode

A voltage ,which remains almost constan even if as usual the welder ,varies the arc gap

A current ,which remains almost constan even if as usual the welder ,varies the arc gap

A and b

All of the above

39. Pre heat prior to the welding of a carbon steel but weld:

Must always be carried out

Is always carried out using a gas flame

Need not be carried out if post weld heat treatment is to follow

None of the above

CSWIP 3.1 Part 4