活性化TIG(A-TIG)与传统TIG相比,可显著增加焊接熔深,改善焊缝成形,降低焊接热输入,从而显著提高焊接接头质量。本文对活性剂提高TIG熔深的机理进行了探讨,重点介绍了“电弧收缩理论”和“表面张力温度梯度改变理论”两种熔深增加机理以及在不同焊接方法、焊接材料和活性剂成分等条件下两种机理的各自作用与表现。 Compared with the traditional TIG, the activated TIG (A-TIG) can significantly increase the welding penetration, improve the weld formation and reduce the welding heat input, thereby significantly improving the quality of the welded joint. In this paper, the mechanism of increasing the penetration of TIG by active agents is discussed. The mechanism of the increase of penetration of TIG and the theory of arc-shrinkage theory and temperature gradient change of surface tension are also introduced. Active ingredients and other conditions under the respective two mechanisms of action and performance.