Current parameters of WPS and PQR
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For the current parameters of WPS and PQR, if SS and PQR welding use a welding current of 135A, what should be the specified range for WPS? In fact, there is a thick-walled stainless steel section, and to ensure melting, the welder used 181A.
The current range specified for PQR should be wider than that for WPS. Welders should abide by welding discipline and carry out welding work strictly in accordance with the WPS.
input in WPS is less than that in PQR
When impact performance requirements are present, the welding heat input of WPS must not exceed the maximum value specified in PQR. Current, voltage, and speed can be interchanged; they can be high or low. However, in WPS, the value of current times voltage divided by speed (a simpler formula; it’s not this formula that is written in the file) cannot exceed the value of PQR. When there are no requirements regarding impact performance, the parameters of WPS are not restricted; the priority is always to ensure a proper weld