不锈钢电弧辅助活性TIG焊

Arc assisted activating TIG welding process for stainless steels

针对不锈钢,提出了一种新型活性TIG焊方法——电弧辅助活性TIG焊,即AA-TIG焊(arc assisted activating TIG welding).该焊接方法通过在正常TIG焊前以活性混合气体作为保护气体,采用小电流钨极电弧预熔待焊焊道表面,可使熔深显著增加,焊接效率大大提高,而且具有可全自动化焊接和工艺可重复性好等优点.分别采用O2+Ar,CO2+Ar,空气作为小电流钨极电弧的保护气体进行了单弧AA-TIG焊.与传统TIG焊比较,发现O2+Ar,CO2+Ar和空气都可显著增加熔深,减小熔宽,焊缝表面成形良好.采用CO2+Ar作为活性混合保护气体进行双弧AA-TIG焊,焊缝成形良好,熔深显著增加.熔深随着焊枪间距减小而增大.

A new activating TIG welding process for stainless steels called AA-TIG(arc assisted activating TIG) welding is proposed.The weld surface is pre-melted by low current tungsten arc with activating mixing shielding gas before normal TIG welding,which can dramatically improve weld penetration and production efficiency and ensure the repeatability of welding process and automatic welding. O2+Ar,CO2+Ar and air are respectively used as the shielding gas of pre-melting with low current tungsten electrode arc for single-arc AA-TIG welding;compared with conventional TIG welding,all of the three mixing gases can increase weld penetration and decrease weld width;all of the weld appearances are fine.When CO2+Ar mixing gas is used as the shielding gas of low current tungsten electrode arc in dual-arc AA-TIG welding,the weld forming is fine,the weld penetration is improved dramatically,but the weld penetration increases as the distance between the welding torches decreases.