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采用不同比例的氮气/氩气混合保护气,对2mm厚的SUS301L奥氏体不锈钢进行了CO2激光焊接试验,研究了不同比例氮气保护条件下焊缝的显微组织、综合力学性能和表面耐腐蚀性能。试验结果表明,在不同比例氮气保护条件下,均可得到微观组织形貌无明显差异的焊接接头,焊缝的氮含量基本与母材一致,焊缝中的相均由γ奥氏体和少量δ铁素体组成;接头抗拉强度、弯曲性能及显微硬度与母材相当;纯氩气保护下焊缝的耐腐蚀性能最好。随着保护气中氮含量的增加,焊缝表面的耐腐蚀性能逐渐降低,但腐蚀速率呈减缓趋势。
CO2 laser welding of 2mm thick SUS301L austenitic stainless steel was carried out by using different proportions of nitrogen / argon mixed protective gas. The microstructure, mechanical properties and surface corrosion resistance of the weld under different nitrogen protective conditions were studied. performance. The results show that under different conditions of nitrogen protection, the welded joints with no obvious difference in microstructure can be obtained. The nitrogen content in the weld is basically the same as that of the base metal. The phase in the weld consists of γ austenite and a small amount of δ ferrite composition; joint tensile strength, bending properties and microhardness and base metal equivalent; pure argon gas welding under the best corrosion resistance. With the increase of nitrogen content in the protective gas, the corrosion resistance of the weld surface gradually decreases, but the corrosion rate tends to slow down.