PWL061 Cryogenic Cooling for HVOF Thermal Spray, Welding 1018 to 4140, Underwater Electrodes, Stress Corrosion Cracking, FSW Equipment, Welding Molybdenum, Underwater Welders Pay and more... DONT USE REPLY to send us your messages Use Contact Us instead. .... We should again heat the weld with the flame, to temper or soften any martensite that could have formed in the process (Local Stress Relief). If that is what we need, that is what we get. ...