What welding material should be used for welding 20# steel pipes with TIG welding?
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Recently, when welding equipment at my workplace, steel pipes made of 20# material were used, and the drawings specified that TIG welding should be used for the root pass. What welding material should be chosen? There are no requirements specified in the standards!
This post was last edited by Reaching for the Moon in Nine Heavens on 2012-12-31 08:17. In our company, JG50 or H08A is used for TIG welding as a backing metal. The poster can refer to NBT47015-2011 \"Welding Code for Pressure Vessels\".
For 20# and Q235 carbon steel, use welding electrodes of grade J426 or J422; the electrode diameter should be 2.5–3.2 mm. Use direct current with reverse polarity. For TIG welding, use wire of type TIG-J50 with a diameter of 2.5 mm, and apply a current of 90–120 A with direct current in positive polarity. For any other questions, please contact me: http://www.bhgd.net
H08MnA or H08Mn2SiA
Pressure vessel pressure-bearing components are not allowed to use J422
This is submerged arc welding wire; you’re answering a question that isn’t relevant
ER50-6 will do. . . .