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Re: [MW:21177] preheating temp. for SMAW and SAW

By Materials & Welding
In principle, the same preheat temperature is typically specified for a WPS and not for each individual process. However preheat is dependent on the hydgrogen level in weld metal (and therefore on type of flux for SMAW and SAW), the heat input, and the base metal composition and combined thickness. Refer to EN1011-2 if you would like to understand more about preheat control.

Rgds 

Sayee

On Sunday, 15 June 2014, rajesh s. mhaske ,Engineer Welding ,PUNE,INDIA <rajesh.mhaske17@gmail.com> wrote:

   Dear sir
              test specimen    : 273 OD*70 mm thk
              welding process :GTAW+SMAW+SAW
              material : SA335 P22
              preheating : 200 deg c
              interpass temp : 350 deg c


Question :  1) what is minimum preheating temp. for SMAW and SAW
                  2) is it necessary to incorporate preheat temp for each process in WPS

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