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使用激光-脉冲MAG复合焊对SUS301L奥氏体不锈钢平板进行了对接焊试验,研究其焊接过程中电弧形态、熔滴过渡,以及其与脉冲电流、电压的对应关系,并分析了焊后接头的组织与力学性能。结果表明:激光-脉冲MAG复合焊的电弧形态及熔滴过渡稳定,呈一脉一滴平稳过渡。焊缝中心主要为细小的柱状奥氏体晶粒和少量的δ铁素体组织。焊缝中心的硬度最低,母材硬度最高,越接近母材硬度越大。接头的平均抗拉强度为736 MPa,达到母材的76%;所有弯曲试样压弯180°后,表面未出现裂纹。SUS301L奥氏体不锈钢激光-脉冲MAG复合焊接的接头质量较好。
The butt welding test of SUS301L austenitic stainless steel flat plate was carried out by using laser-pulse MAG composite welding. The arc shape, droplet transition and its corresponding relationship with pulse current and voltage during welding were studied. Tissue and mechanical properties. The results show that the arc shape and the droplet transfer of the laser - pulse MAG composite welding are stable and the pulse train transitions smoothly. The weld center is mainly composed of small columnar austenite grains and a small amount of δ-ferrite. The lowest hardness of the weld center, the highest base metal hardness, the closer to the base material hardness. The average tensile strength of the joint was 736 MPa, reaching 76% of the base metal. No cracks were observed on the surface after all the bent specimens were bent 180 °. SUS301L austenitic stainless steel laser - pulsed MAG composite welding joints better quality.