焊接工艺对2205双相不锈钢接头组织与性能的影响

Effect of Welding Process Parameters on Structure and Property of 2205 Duplex Stainless Steel Weld Joint

针对2205双相不锈钢的性能特点,焊接时通过优化焊接工艺以有效控制焊接热循环,使接头中能获得预期的显微组织和相比例。对获得接头进行力学性能测试,利用扫描电镜和光学显微镜观察分析其显微组织结构。结果表明:采用混合气体(氩气+2.5%氮气,体积分数)保护的钨极氩弧焊能使获得接头具有较高的强度,接头焊接区保持了与母材相同的组织结构和较为接近的相比例。

When welding thermal cycle was controlled effectively by optimizing welding technology, the ideal microstructure and phase proportion can be obtained in the weld joint. According to the characteristics of 2205 duplex stainless steel, the mechanical properties of the weld joint were tested with tensile machine, and the joint microstructure was analyzed by using scanning electron microscope and optical microscope. The results showed that the higher strength can be obtained with the welded joint by using mixed gas （argon ＋2.5% nitrogen,volume fraction） tungsten arc welding. The analysis of microstructure illustrates that the weld joint had almost the same phase structure and similar phase proportion as that of base material.