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  1. Welding Engineer

    Maximum Preheat Temperature in Power Piping

    After cross-referencing between ASME IX and B31.1 I found the correlation about the maximum preheat temp. in QW-406.7 of ASME IX, which states that "a change in the preheating temperature of more than 25°F (15°C)" will be considered to affect the mechanical properties of the weldment and...
  2. Welding Engineer

    Maximum Preheat Temperature in Power Piping

    Hello Members, ASME B31.1 specifies minimum preheat temperature for P-No. 5B and P-No. 15E at 205 deg. C for all thicknesses. How many degrees may the preheat temp. exceed the specifies min. preheat temp? Best regards, MZA

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