Welder Red Seal · Question
According to the Red Seal Occupational Standard, which of the following is an example of an 'essential variable' in a Welding Procedure Specification (WPS) that, if changed, requires re-qualification?
Essential variables are parameters in a WPS that, if changed beyond specified limits, are considered to significantly affect the mechanical properties and integ
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Question: According to the Red Seal Occupational Standard, which of the following is an example of an 'essential variable' in a Welding Procedure Specification (WPS) that, if changed, requires re-qualification?
Answer options: ✅ Change in base metal thickness beyond specified range
- Change in welding machine colour
- Change in shielding gas bottle supplier
- Change in welder's glove brand
Correct answer: Change in base metal thickness beyond specified range
Explanation: Essential variables are parameters in a WPS that, if changed beyond specified limits, are considered to significantly affect the mechanical properties and integrity of the weld. Base metal thickness, type of filler metal, and preheat temperature are common essential variables.
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