We are welding stainless steel pipe (316 to 316, 316L to 316L or Duplex to Duplex). Our normal sizes range from 3" to 4" OD and wall thickness ranging from .250" to .600" thick. During the welding of these pipes it has taken us up to 8 hours using GTAW process due to not exceeding our WPS maximum interpass temperature. Is there any acceptable means of slightly accelerated cooling once the max interpass temperature has been reached? I am only looking to maintain my WPS preheat to maximum interpass temperature without waiting for the weld to reach near preheat temperature, in normal still air, before the next pass. Is cooling with forced air, between passes, by way of fan or air line acceptable? My parameters for 316 & 316L are 146F Preheat to 285F Max Interpass and for Duplex 100F Preheat to 225F Max Interpass.
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