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针对1mm厚TC4钛合金薄板进行光纤激光-钨极惰性气体保护焊(TIG)电弧复合焊接试验,研究了激光功率、电弧电流、热源间距、保护气成分等工艺参数对焊缝成形的影响,同时分析了焊接接头的显微组织及力学性能。研究结果表明:随着电弧电流增加、主保护气中He气比例升高,焊缝的熔化量逐渐增加;随着激光功率和两热源间距的增加,焊缝熔化量呈波动性变化。焊缝咬边程度和复合热源的热输入有关,输入的能量越大越集中,焊缝咬边深度越小。焊接保护效果主要由电弧输入的热量决定,输入的热量越大,保护效果越差。在优化的工艺参数下,复合焊接的接头抗拉强度高于母材,延伸率低于母材,这与焊缝中马氏体组织的分布有关,拉伸断裂位于母材。
The effects of laser power, arc current, heat source spacing, shielding gas composition and other parameters on the weld formation were investigated in a 1 mm thick TC4 titanium alloy sheet by using a laser-tungsten inert gas arc welding (TIG) The microstructure and mechanical properties of welded joints were analyzed. The results show that with the increase of arc current, the proportion of He gas in the main shielding gas increases and the melting amount of the weld seam increases gradually. With the increase of the laser power and the distance between the two heat sources, the weld melting amount fluctuates. The degree of weld undercuts is related to the heat input of the composite heat source. The greater the energy input, the greater the concentration, and the lower the depth of the weld undercuts. Welding protection is mainly determined by the heat input to the arc, the greater the input heat, the poorer the protection. Under optimized process parameters, the joint tensile strength of composite welding is higher than that of base metal, and the elongation is lower than that of base metal, which is related to the distribution of martensite in the weld. The tensile fracture is located in the base metal.