Preheat and interpass temperature control is listed as which type of variable in a WPS?

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Multiple Choice

Preheat and interpass temperature control is listed as which type of variable in a WPS?

Explanation:
In a WPS, variables are the controllable process conditions that directly influence the weld outcome. Preheat and interpass temperature control are welding variables because they govern how the base metal and weld metal behave during heating and cooling, affecting hydrogen diffusion, tempering, and the risk of cracking. These are conditions you monitor and adjust during welding to ensure consistent metallurgical properties and quality. They aren’t joint design details, backing strip choices, or cleaning steps, which are separate categories.

In a WPS, variables are the controllable process conditions that directly influence the weld outcome. Preheat and interpass temperature control are welding variables because they govern how the base metal and weld metal behave during heating and cooling, affecting hydrogen diffusion, tempering, and the risk of cracking. These are conditions you monitor and adjust during welding to ensure consistent metallurgical properties and quality. They aren’t joint design details, backing strip choices, or cleaning steps, which are separate categories.

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