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Min. Qualified Preheat Temp

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SHG

SHG

Mechanical
Joined
Oct 27, 2002
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If in preparing of test coupon for PQR I have the min. preheat temp. as starting temp. of welding, about 80 C and during the progress of the welding the temperature of the coupon raised for example to 250 C. May I specify the Min. Preheat Temp. in WPS as 30 C because of the para. QW406.1 of ASME Sec. IX.
 
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Yes. You can always elevate preheat without re-qualifying the welding procedure. However, Section IX limits the decrease in preheat to 50 deg C.
 
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