essential variables and nonessential variables

Essential Variables, nonessential variables and Supplementary Essential Variables in WPS

What is essential variable? Many variables and parameters affect welding quality such as such as such as joint details, base metals, filler metals, positions, preheat, PWHT. These parameters are known as WELDING VARIABLES (QG-105 & QW-250). All these variables are mentioned in WPS – Welding Procedure Specification so a welder or welding operator can develop good quality welding. In production, we have limitations, welding results can not be examined thoroughly. Some welding defects, can be seen visually by the Visual Welding inspector such as CSWIP 3.0 Welding Inspector. However strength, ductility and corrosion resistance can only be checked using destructive[…]

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