氩氢混合气体对S30403不锈钢K-TIG焊接接头组织与性能的调控机制研究

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Abstract： The application of pure argon and argon-hydrogen mixed gas in K-TIG welding of S30403 stainless steel was discussd.The arc morphology under two shielding gases was observed by high-speed camera technology. Combined with electron backscater diffraction， microhardnessand tensile tests，the influence mechanism of hydrogen on the welding process was systematically studied.The results show that the penetration depth under the protection of argon-hydrogen mixed gas is greater than that under the protection of pure argon， and there are no defects such as pores in the weld.The arc under the protection of argon-hydrogen mixed gas is more concentrated， the arc diameter is significantly reduced，and the arc stiffness and heat source energy density are improved. In addition，the weld microstructure under argon-hydrogen mixed gas protection showed more uniform multi-orientation characteristics，and the maximum texture index decreased from 33.96 under pure argon protection to 21.52.The addition of hydrogen significantly reduced the ferrite content in the weld （from 19.7% to 11.7% ）.Although the tensile strength decreased slightly（from 664.4MPa±2.3MPa to ，theelongationincreased（from 50.46%±0.89% to 53.23%±0.68% ）.The effect of hydrogen addition on the optimization of welding process was further verified.

Keywords：S3o4O3 stainless steel;K-TIG;argon-hydrogen mixed gas

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传统钨极惰性气体保护焊（TIG焊）作为中厚板焊接的经典工艺，通常采用低电流直流模式实现高质量连接，但其技术局限性显著：单道熔透 3mm 厚度需进行坡口预处理并匹配填充焊丝，导致中厚板焊接需采用多层多道工艺，严重制约生产效率。（剩余11543字）