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CWB 2 All Module Exams Questions and Answers Already Passed
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CWB 2 All Module Exams Questions and Answers Already Passed
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CWB 2 All Module ExamsQuestions and Answers Already
Passed
Microprocessor controls are used in the more modern welding power sources to:
A) Provide more sophisticated levels of control for the welding system
B) Allow welding variables to be stored for use later
C) Provide feedback control
D) All of the above ✔✔D) All of the above
Inverter welding power sources provide increased control over the welding arc because they:
A) Utilize feedback control
B) Can respond very quickly to correct any changed in the welding circuits
C) Can utilize advanced pulsed waveforms to allow out of position welding using spray transfer
D) All of the above ✔✔D) All of the above
It would be correct to say:
A) Expansion and contraction are proportional to the dimensions of the heated area
B) When a bar is heated under restraint, its stress relieves itself as it cools
C) Slow cooling of a heated area will provide the greatest amount of shrinkage
D) When metal is heated it expands, but it does not shrink back to its original size when it cools ✔✔A)
Expansion and contraction are proportional to the dimensions of the heated area
To reduce the amount of angular distortion you should:
,A) Increase the travel speed
B) Reduce the angle of preparation
C) Pre-heat the metal
D) All of the above
E) None of the above ✔✔D) All of the above
When a structural member has been bent sharply, it can be straightened by heating:
A) A vee shaped section of the web underneath the bent area of the flange
B) The inside corner of an angle, channel, i-beam, or T bar
C) A vee shaped area at the point of the greatest bend, with the top of the vee at the point of
greatest bend
D) All along the edge of the section
E) All along the edge opposite of the one which is bent ✔✔C) A vee shaped area at the point of
the greatest bend, with the top of the vee at the point of greatest bend
Of the many mechanical means of controlling distortion, the following will have the least residual stress:
A) Rigid clamping
B) Subassembly of the sections
C) Heavy strongbacks, welded on both sides of the joint
D) Similar weldments clamped back to back
E) Pre-set the plates to allow recovery of angular distortion ✔✔E) Pre-set the plates to allow recovery
of angular distortion
Decreasing the number of weld beads in a specific weld will:
, A) Result in annealing the weld area
B) Give a finer grain structure
C) Reduce the transverse shrinkage
D) Increase the transverse shrinkage
E) Possibly crack the root pass ✔✔C) Reduce the transverse shrinkage
The neutral axis is the:
A) Line on which there will be neither tension nor compression when the piece is flexed or bent
B) Centreline of a weld bead halfway between the root pass and the face pass
C) Outside centreline of the web of a channel
D) Inside corner line of an unequal leg steel angle
E) Dimensional halfway point of a welded assembly ✔✔A) Line on which there will be neither
tension nor compression when the piece is flexed or bent
When expansion and contraction are prevented, heating and cooling may cause:
A) No residual stresses
B) Failure due to lamellar tearing
C) No permanent deformation or failure
D) Failure when the metal is highly ductile
E) Failure when metal is not sufficiently ductile ✔✔E) Failure when metal is not sufficiently ductile
When heated, unrestrained metal will expand:
A) Transversely (across the weld)
B) Volumetrically (in all directions)
C) Until it upsets
D) Longitudinally (lengthwise)
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