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CWB 2 VISUAL WELD INSPECTOR EXAM NEWEST
2024-2025 ACTUAL EXAM COMPLETE 1000
QUESTIONS AND CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS ) |ALREADY GRADED A+
The net result of thermal cutting using one torch on the long
edge of this plate is: - ANSWER- Shrinkage of the cut edges due
to the restricted expansion of the cut edge
In order to control distortion, complex parts are built in fixtures.A Fixture is - ANSWER- Causes the weld area to stretch further as it cools.
Distortion is the result of - ANSWER- Permanent shape change created by free expansion and contraction in one or more directions
The weld of seams - ANSWER- should be stopped 300 - 400mm short of an unwelded butt joint
A reference point occupying the middle position of the symmetrical shape is known as - ANSWER- neutral axis
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Preheating reduces distortion by - ANSWER- Transverse and longitudinal shrinkage only
The dimensions and temperature change of the heated area are proportional to the - ANSWER- Resulting expansion and contraction
X-ray diffraction is used to measure residual stresses and compare changes in - ANSWER- atomic spacing
The unit measurement for the coefficient of the thermal expansion - ANSWER- micrometer per meter per degree Celsius
Line heating , strip and V heating are techniques used - ANSWER- Plate forming
Peening reduces distortion by - ANSWER- Stretching the weld metal
How does the travel speed in welding affect the resulting distortion - ANSWER- The incorrect speed will create temperature gradients
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Fillet welds created in several small passes will cause - ANSWER- more angular distortion
Flame straightening or forming is performed by quickly heating a localized area. For low alloy steels the maximum temperature of the heat spot should not exceed - ANSWER- 650 C
When the component is welded on one side only, the unbalanced shrinkage forces will - ANSWER- Cause the welded side to shorten
To become reduced in size, to pull together, shrink or wrinkle is know as - ANSWER- contraction
If all reasonable precautions are taken to prevent distortion, then
- ANSWER- some distortion may still occur regardless of
precautions
Thermal and mechanical processes used during manufacturing can cause a condition in the metal known as - ANSWER- residual stresses
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Cambering a beam will allow a curvature predominantly in which of the following directions - ANSWER- The flanges will curl up or down while the web stays flat
To minimize distortion when welding full penetration butt joint, the welding should be carried out in such a way that the sequence is balanced around the - ANSWER- neutral axis
Cracking will most often occur which of the following situations
- ANSWER- Restricted contraction and free expansion are
prevented
Distortion is defined as - ANSWER- A physical change in shape by bending, twisting or warping
A shape change produced by stress is known as - ANSWER- Strain
what is plastic deformation - ANSWER- A shape change not reversible by removal of the external forces which caused it
The fundamental cause distortion is - ANSWER- localized shape change
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