脉冲TIG焊参数对铝合金焊缝组织与性能的影响

Influence of welding parameters of pulse TIG on weld microstructure and mechanical property of aluminum alloys

通过采用脉冲变极性TIG焊接方法对1.5 mm厚的5A06铝合金和L3纯铝以及3 mm厚的5A06铝合金和5A06铝合金试板进行焊接试验,研究了在其它两个条件不变的情况下脉冲频率、基值电流和占空比分别对焊缝组织与力学性能的影响规律。研究结果表明:当脉冲频率为100 Hz,基值电流为峰值电流的10%～33%,占空比为50%～66%时,焊缝具有良好的组织和力学性能。

Two welding tests of 1.5 mm 5A06 aluminum alloy plate welded with 1.5 mm L3 aluminum plate and 3 mm 5A06 aluminum alloy-plate with 3 mm 5A06 aluminum alloy plate were conducted by welding method of pulse changing polarity TIG. The influence rule of pulse frequency, basic value current and duty ratio on weld microstructure and mechanical property was researched when other two conditions were unchanged. The research indicates when pulse frequency is 100 Hz, basic value current is 10%-33% of peak value current and duty ratio is 50%-66%, the welded joint possesses good microstructure and mechanical property.