Tag Archives: essential variable

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21 Changes to PQR Essential Variables that Require WPS Requalification

​Have you ever seen a welding procedure specification with established amperage ranging from 200 to 550 amps? Or voltage ranging from 21 to 29 volts? Or some other variable with a huge window? This is all too common, but extremely dangerous. Why? Because changes to essential variables beyond that which is reasonable will affect the […]

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11 Reasons Why Welders Don’t Follow Welding Procedures

The purpose of having welding procedures specifications (WPS) is to ensure quality. This is accomplished by giving the welder a detailed set of instruction on how to deposit weld metal for a specific joint.  Consistent quality can be achieved, but there is one caveat.  The welding procedures must be well written.  A poorly written welding […]