Do i need to retest my welders when introducing preheat?

Topic American Welding Society Services / Technical Standards & Publications / Do i need to retest my welders when introducing preheat?

By Kix

Date 03-08-2007 20:25

Following the D1.2/D1.2M2003 aluminum structural code do i have to requalify a procedure and retest my welders if i want to start using preheat on an application that was not qualified with preheat. Base material is 1/2" T6-6061 using a 4643 filler,1/4" to 5/16" fillets with wire feed and tig processes. I'm telling these guys we have to use preheat to control their distortion probs and need to know if we're going to get put on hold for retest and the whole 9 yards.. Thanks ahead for any help in this case!!

By 803056

Date 03-11-2007 23:01

I only have AWS D1.2 -1990 handy. A quick review of paragraph 5.16 lists the variable limitations that would entail requalification of the procedure.

Paragraph 5.16 (7) addresses preheat for heat treatable aluminum alloys. An increase of 100 degrees F requires requalification. I suggest checking the editions of D1.2 you are using for similar requirements.

Best regards - Al

Topic American Welding Society Services / Technical Standards & Publications / Do i need to retest my welders when introducing preheat?