| METALS AND METAL MATRIX COMPOSITES |
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| Effect of Active Agent on Depth of Fusion,Microstructure and Mechanical Properties of PPCA-TIG Welded Joints |
| HE Zhenggang1, HUANG Yong1,2,*, XU Chenghao1, GAO Hewen1, WEI Yakui1, HUANG Jiankang1,2
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1 School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
2 State Key Laboratory of Advanced Processing and Reuse of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China |
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Abstract Tungsten inert gas shielded welding (TIG welding) is one of the common methods for welding stainless steel, but it has some disadvantages such as beveling requirement when welding medium-thick plate, shallow weld depth, low productivity and poor economy. This work adopted a new efficient welding method—powder pool coupled active TIG welding (PPCA-TIG welding), taking 1Cr18Ni9Ti austenitic stainless steel as the research object, through the active agent ratio test to obtain the maximum depth of fusion weld, and studied the effect of active agent on the microstructure and mechanical properties of PPCA-TIG welding. The results show that, compared with the joints obtained from conventional TIG welding, when using D2 active agent ratio welding, the post-weld depth of fusion is increased by nearly 2.7 times, the arc shrinkage occurs signi-ficantly, the weld organization is refined; joint hardness is increased by 9.8%, tensile strength is increased by 53.7%, and the fracture mode of the joint is toughness fracture. In summary, D2 active agent is the optimal ratio for PPCA-TIG welding, this method not only improves the welding quality, but also significantly improves the production efficiency.
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Published: 25 December 2025
Online: 2025-12-17
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