基于等离子弧焊的Ti-6Al-4V快速成形工艺参数研究

Study on the Process Parameters of Building Ti-6Al-4V Alloy Parts by Plasma Arc Welding-based Rapid Prototyping

摘要:

介绍了基于等离子弧焊的钛合金零件直接金属快速成形方法。采用正交试验和成形温度对比测试的方法，研究了脉冲电流强度、占空比等六个重要工艺参数对成形轨迹截面宽高比的影响规律。结果表明：脉冲电流强度、占空比、送丝速度、工作台速度对宽高比的影响非常显著，等离子气流量对宽高比的影响显著，而脉冲频率的影响不显著。采用获得的优化参数制作了Ti-6Al-4V零件，并进行了抗拉强度和致密度测试，结果表明其抗拉强度和致密度与激光熔覆成形件的性能相当。

Abstract:

A direct metal rapid prototyping process based on the plasma arc welding is presented. The impacts of six important process parameters, such as pulse current, wire-feeding speed etc, on the ratio of width to height of the deposited track cross-section (λ) is investigated by Taguchi method and temperature contrast experiments. The experimental results showed that pulse current, duty circle, wire-feeding speed, scanning speed exert significant effects on λ. The plasma gas flow-rate has significant effect on λ, and pulse frequency has not significant effects on λ. The tensile strength and density of Ti-6Al-4V part fabricated with the optimized parameters is tested. The results show the test data is similar to the parts fabricated with laser deposited process.