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通过金相分析、室温拉伸以及维氏硬度测试等对4003铁素体不锈钢的等离子+TIG复合焊焊缝晶粒尺寸及力学性能等进行了研究。试验结果表明:4003铁素体不锈钢的等离子+TIG复合焊接能够得到成形良好的焊缝。热输入在1.12~1.26 kJ/mm时,热输入越低焊缝晶粒尺寸越小,最小的平均晶粒尺寸为28.7μm。等离子气流量为4.0 L/min时可以获得相对细小的晶粒。适当加快焊缝焊后冷却速度也能够起到细化晶粒尺寸的作用。不同的工艺参数下焊接接头拉伸试样均断裂在母材处,表明等离子+TIG复合焊能得到较高性能的焊缝。焊接接头焊缝区的硬度最高,热影响区次之,母材最低。
The grain size and mechanical properties of plasma-TIG composite weld of 4003 ferritic stainless steel were investigated by metallographic analysis, room temperature tensile test and Vickers hardness test. The experimental results show that the plasma welding of 4003 ferritic stainless steel with TIG composite welding can get well-formed weld. Heat input at 1.12 to 1.26 kJ / mm, the lower the heat input, the smaller the grain size of the weld, the smallest average grain size of 28.7μm. When the plasma gas flow rate is 4.0 L / min, relatively fine grains can be obtained. Appropriate to speed up the weld after welding cooling rate can also play the role of grain size refinement. Tensile specimens of the welded joints under different technological parameters all broke at the base metal, indicating that the plasma-TIG composite welding can obtain higher performance welds. Weld joint weld zone hardness, followed by heat affected zone, the lowest base metal.