[MW:21188] Re: preheating temp. for SMAW and SAW

Hi,

I am assuming that the applicable codes of construction are ASME B31.1 or ASME B31.3 -

B31.1 requirements - yes you are correct with the minimum temperature for this material type and grade, Par 131 gives details on preheat requirements are a function of material specification & grade and thickness in cases/scenarios stated on Par: 131, not the welding process to be employed in completing a process joint particular to your case.

B31.3 - requires a minimum of 177 deg C for the material specification and grade, it is a function of mainly material type & grade and thickness, welding process is not a determining factor, this is all entailed on Par 331 and the corresponding table of this paragraph.

Thanks,

Note: since preheat is an essential variable
On Sunday, June 15, 2014 8:34:32 AM UTC+2, rajesh s. mhaske ,Engineer Welding ,PUNE,INDIA 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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