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Fillet weld preheat

Fillet weld preheat

Fillet weld preheat

We have an AWS qualified CS(P1 to P1)WPS,without preheat.
We have 40 to 50 mm CS base material that requires 10mm fillet welds on 2 sides. Required preheat for this thickness
is per Table 3.2, 150F / 65C. Can I use the qualified AWS WPS (without preheat)to weld these fillets, preheating as required for the thickness, or must I qualify another WPS
with the required preheat.

RE: Fillet weld preheat

Preheat can always be increased from the minimum that was qualified. I would preheat according to Table 3.2, and use the AWS qualified procedure.

RE: Fillet weld preheat

Preheat isn't typically WPS-dependent, if nothing else because the plate thickness on your WPS may not be the same thickness as your piece.


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