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Recent content by winai

  1. winai

    Preheat to remove moisture before welding.

    Hi All, Again confessing about preheat with heating torch. In morning time when apply heat by heating torch. We will see water( byproduct of combustion is H2O). But start from 10 o' cock or even in the afternoon. Why we didn’t see any water when during preheating? Any one who know or have...
  2. winai

    Preheat to remove moisture before welding.

    Hi thanks for all of u in put. Because some of CWI tell me that steel is absorbed moisture in a night time. So In the morning before start welding we need to apply preheat to remove moisture even code not required. wherever in work shop or out side . I think I need to tell the CWI go back to...
  3. winai

    Preheat to remove moisture before welding.

    More information FCAW process plate grade AH 36 T-JOINT web pate is 1/2”(12.7 mm) thick and face plate 5/8”(16 mm) thick. Ambient temperature 25-30 degree C. according to D1.1 code minimum preheat is 0 degree C.So preheat is not required by the code.BUT WPS have mention about minimum preheat...
  4. winai

    Preheat to remove moisture before welding.

    Hi, I have some WPS mention a bout minimum preheat temperature: Preheat to remove moisture I,m finding in AWS D1.1 CODE. But cant find it. What is meaning of this moisture need to remove?any idea pls help me to clarify about this” Moisture. Thanks winai
  5. winai

    Unlisted steel qualified by PQR Clause 4. (AWS D1.1)

    Dear, All If unlisted steel qualified by PQR Clause 4. D1.1 ( Single V Butt joint with ceramic backing). Can qualified for? 1, PQR Base metal ( Single Bevel, Double Bevel, Double V with ceramic backing , steel backing)? 2, PQR Base metal ( Single Bevel, Double Bevel...
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