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Q. What are Preheat and interpass temperature?
Preheat and interpass temperatures shall be in accordance with the applicable codes. Materials that require preheat for welding shall receive a comparable preheat for thermal gouging and cutting, and tack welding.
The minimum metal temperature for welding shall be 10°C (50°F).
The maximum interpass temperature for austenitic stainless steel shall be 177°C (350°F).
The metal temperature shall be maintained at preheat temperature until weld is completed. An insulation wrap shall be placed around the joint to facilitate slow cooling.
Temperature melting crayons (Tempil-stick or equal) or contact pyrometers shall be used to determine preheat and interpass temperature. Temperature determination will be taken on the opposite side of the heating source.
Heat Treatment of Stainless Steels: Stainless steels, as other steels, react to heat treatments over broad range. They are subjected to one or more of the given heat treatmen
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