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Hi Leedrong, I would check into localized PWHT (electric heaters) on the welds only since you stated that only the welds need to be PWHT. There are alot of company's that do this, and the documentation should satisfy your customer. If you plan on sticking the unit into a furnace, I agree with...

I've seen Boilermakers stick pieces of light cardboard inside the socket joint to keep the gap, and it just burns away during the welding process