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.
Red Flag Submitted
Thank you for helping keep Eng-Tips Forums free from inappropriate posts. The Eng-Tips staff will check this out and take appropriate action.
Reply To This Thread
Posting in the Eng-Tips forums is a member-only feature.
More and more manufacturers are getting into the Industrial Internet of things (IIoT). Those that succeed early in the IIoT arena can be leaders in their market, or solidify their position. Download Now