| 摘要 |
PROBLEM TO BE SOLVED: To efficiently form an excellent welding joint of stainless steel by a simple equipment. SOLUTION: The arc energy density is increased by converging the arc using the argon gas in which hydrogen gas of 1-7% is mixed as the shield gas. As for the dimensions of the V-shaped groove, the thickness t0 of the root surface is 0.1-1.5 mm, and the appropriate range of the V-shaped angleαis 65-80 deg., and a copper or ceramic backing having the groove of 0.5-1.5 mm in the depth (d) and 10-40 mm in width w1 , is fixed to the inner side of the V-shaped groove, the molten metal is kept and cooled at the back side of the TIG arc, and the dimensional margin of the root gap of the V-shaped groove is expanded to 0-2.0 mm to achieve the excellent welding of austenitic stainless steel tubes to be joined with each other.
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