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Weld Weldin ing g Insp ection ecti on,, Steels Steels – WIS WIS 5 Multi – Choic e Questio n Paper (MSR-WI (MSR-WI-2) -2) Name: ……………………………… …………………………………………… ……………… … An sw er al l qu est io ns
1.
2.
3.
4.
Defects outside the permissible limits of the applicable specification should be: a.
The decision is up to the welding inspector.
b.
Repaired.
c.
Always double checked using NDT.
d.
All of the above.
Flux cored wires may be advantages over solid wires because: a.
Higher deposition.
b.
Lower hydrogen contents in the deposited welds.
c.
Easy addition of alloying elements.
d.
Both a and c.
e.
All of the above.
Movement of the arc by magnetic forces in an arc welding process is termed: a.
Arc deviation.
b.
Arc misalignment.
c.
Arc blow.
d.
Stray arc.
A crack type most associated with the submerged arc welding process is: a.
Hydrogen cracking in the HAZ.
b.
Solidification cracking.
c.
Lamellar tearing.
d.
Fatigue cracking.
WIS 5 Qu paper MSR-WI-2 issue 4 Date: 17/02/05
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THE WELDING INSTITUTE
5.
6.
7.
8.
Which of the following processes joins metals plastically. a.
Friction welding.
b.
Resistance welding.
c.
Arc welding.
d.
Plasma welding.
e.
All of the above.
What type of power source characteristic is required for a manual process? a.
Constant voltage.
b.
Flat characteristic.
c.
Drooping characteristic.
d.
None of the above.
Which of the following electrodes and current types may be used for the TIG welding of nickel and its alloys? a.
Cerium electrode, DC –ve.
b.
Zirconium electrode, AC.
c.
Thorium electrode, DC +ve.
d.
All of the above may be used.
What are the possible results of having a heat input to low? a.
An increase in hardness, lower yield strength and lack of fusion.
b.
A reduction in toughness, hydrogen entrapment and an increase in hardness.
c.
Entrapped hydrogen, an increase in hardness and lack of fusion
d.
Entrapped hydrogen, a reduction in carbon content and lack of fusion.
WIS 5 Qu paper MSR-WI-2 issue 4 Date: 17/02/05
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9.
10.
11.
12.
The main reason for using a back purge when welding 18-8 stainless steel with the TIG welding process is to: a.
Improve positional welding.
b.
Prevent the possibility of porosity.
c.
Prevent excessive root penetration
d.
Prevent the formation of a dense oxide layer forming in the root.
The possible effects of having a travel speed too fast: a.
Low toughness, slag inclusions and cap undercut.
b.
High hardness, slag inclusions and a narrow thin weld bead.
c.
High hardness, excessive deposition and cold laps
d.
Low toughness, poor fusion and slag inclusions.
If arc blow exists when welding with the MMA welding process, this can be best reduced or eliminated by: a.
A change from AC to DC current.
b.
A change from DC to AC current.
c.
A change from DC +ve to DC –ve.
d.
A change from DC –ve to DC +ve.
When welding a double-V butt weld with the submerged arc welding process the presence of centre line porosity may be due to: a.
Damp flux.
b.
Contamination on the weld preparations.
c.
Incorrect flux depth
d.
All of the above.
WIS 5 Qu paper MSR-WI-2 issue 4 Date: 17/02/05
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13.
14.
15.
16.
The inclusion of an inductance in the welding circuit when using MIG/MAG welding process is to: a.
Control the rate of spatter in the dip transfer mode.
b.
It enables the welder to weld in position with the spray transfer mode.
c.
It allows for thicker filler wires to be used (2.6-3.6mm diameter).
d.
It allows full control over droplet size in the spray transfer mode.
An undesirable property of aluminium oxide residue, when welding is that it: a.
Decrease weld pool fluidity.
b.
Requires more heat to melt it when compared to aluminium.
c.
Causes the welder to travel to quickly.
d.
The presence of the oxide makes aluminium impossible to weld.
When welding with the MIG welding process using pure argon as the shielding gas on carbon steel, which of the following problems are likely to occur? a.
Copper inclusions and excessive cap heights.
b.
Excessive root penetration and porosity.
c.
Slag inclusions and crater pipe.
d.
Lack of fusion and poor cap profiles.
When considering the tungsten arc welding process what is the purpose of the down-slope (slope-out) control? a.
Ensure good penetration.
b.
To prevent arc striking on the parent material.
c.
To help prevent the formation of crater pipe and possible cracking.
d.
To help prevent tungsten inclusions during welding.
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THE WELDING INSTITUTE
17.
18.
19.
20.
When considering thermal cutting local hardening can be reduced by: a.
Increasing the cutting speed.
b.
The use of propane as a fuel gas.
c.
Pre heating the material to be cut.
d.
All of the above.
In a semi-automatic welding process, which of the following shielding gas/gas mixtures would normally give the deepest penetration on steel? a.
100% argon.
b.
100% CO2.
c.
75% argon + 25% CO2.
d.
All of the above would give the same depth in penetration.
In a MMA welding process, which of the following statements are false? a.
An arc gap, which remains almost constant even if as usual the welder varies the position of the electrode.
b.
A voltage, which remains almost constant even if as usual the welder, varies the arc gap.
c.
A current, which remains almost constant even if as usual the welder, varies the arc gap.
d.
A and b.
e.
All of the above.
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 25 mm, flat welding position. a.
Dip transfer.
b.
Pulse transfer.
c.
Spray transfer.
d.
Globular transfer.
.
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21.
22.
23.
24.
Which of the following current types would you expect to be used for the welding of aluminium with the TIG welding process? a.
DC -ve.
b.
DC +ve.
c.
AC
d.
All of the above.
Which of the following statements is false? a.
In the MMA welding process electrode DC + produces a deep narrow weld pool, which is fast freezing.
b.
DC electrode positive is used for the MAG welding of steel plate.
c.
In the MAG welding process the wire feed speed remains constant during the welding operation
d.
All of the above
When considering hydrogen, which of the following welding process would produce the lowest levels in the completed weld (under controlled conditions) a.
MMA.
b.
SAW.
c.
TIG.
d.
FCAW.
Pre heat prior to the welding of a carbon steel butt weld: a.
Must always be carried out.
b.
Is always carried out using a gas flame
c.
Need not be carried out if post weld heat treatment is to follow
d.
None of the above.
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25.
26.
27.
28.
In steel the element with the greatest effect on hardness is: a.
Chromium.
b.
Manganese.
c.
Carbon.
d.
Nickel.
For a given voltage and current settings on a MMA welding plant, when the arc length is shortened, which of the following will be most affected. a.
The current will increase.
b.
The current will decrease.
c.
The voltage will decrease.
d.
The voltage will increase.
Which of the following best describes a semi-automatic welding process? a.
The welder is responsible for the maintaining the arc gap and travel speed.
b.
The welder is responsible for travel speed only; arc gap is kept constant by the welding plant.
c.
Both travel speed and arc gap is controlled by the welding plant
d.
All of the above.
What is purpose of a rectifier in a welding sets electrical circuit? a.
To keep the arc stable when using low current settings
b.
To convert AC current to DC current.
c.
To convert DC current to AC current.
d.
To initiate the arc at start up.
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THE WELDING INSTITUTE
29.
30.
When calibrating a mechanised MAG welding plant, which of the following applies (WFS = Wire feed speed)? a.
Check – WFS, current, volts and wire diameter.
b.
Check – WFS, joint set-up, gas flow rate and WFS.
c.
Check – Gas flow rate, stick out length, WFS and current.
d.
All of the above.
The main usage of the arc air process is: a.
The cutting of a weld preparation.
b.
The removal of defective welds.
c.
For the cutting of non-ferrous materials only.
d.
For the cutting of ferrous materials only.
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