关键词: AA-TIG焊, 不锈钢, 焊缝成形, 焊缝化学成分, 焊缝性能, 焊缝组织, 活性TIG焊

Abstract: A new activating TIG welding process for stainless steels called AA-TIG welding is proposed. The CO2+Ar mixing gas is used as the activating mixing shielding gas of the low current tungsten electrode arc. A series of single-arc AA-TIG welding experiments are made to study the effects of experimental parameters of low current tungsten electrode arc and normal TIG welding on the weld penetration of AA-TIG welding. For the optimal process parameters, the weld forming, weld microstructure, weld composition and weld property are also investigated. The results indicate that AA-TIG welding can be used to get full penetration of 10 mm thickness stainless steel plate in a single pass. Compared with conventional TIG welding, there is hardly any difference between the weld microstructures and the weld compositions of conventional TIG welding and AA-TIG welding. The Cu/CuSO4 corrosion resistance and the low temperature impact toughness of the weld of AA-TIG welding meet the related standards.

Key words: AA-TIG welding, Activating TIG welding, Stainless steel, Weld chemical composition, Weld forming, Weld microstructure, Weld property