本文提出了一种采用小型气罩屏蔽的局部干法水下TIG焊接方法,并对该法的焊接工艺过程、焊缝冷却特性及焊缝的性能进行了研究。结果表明,该法具有电弧过程稳定,焊接参数易于控制并能在较宽的范围内调节等特点,因此容易获得高质量的焊缝。这对水下高合金钢的焊接及结构钢底层焊有着特殊的意义。 In this paper, a local dry submerged TIG welding method with a small gas shield is proposed. The welding process, the cooling characteristics of the weld and the performance of the weld are studied. The results show that this method has the characteristics of stable arc process, easy control of welding parameters and wide range of adjustment, so it is easy to obtain high quality weld. This is of special significance for the welding of underwater high-alloy steels and the structural steel underfloor welding.