DP-TIG高速焊接工艺研究

深熔钨极气体保护焊(deep penetration TIG welding,DP-TIG焊)具有焊接熔深大的优点,在厚板焊接领域具有极大优势.为了拓展DP-TIG焊在薄板高速焊领域的应用,分别针对低碳钢和不锈钢板材,调整焊接电流、焊接速度、钨极锥角、气体成分等工艺参数,进行了薄板高速焊接工艺研究.结果表明:相对常规TIG焊,对于2 mm厚的低碳钢板焊接速度提高了75%,对于3 mm厚的不锈钢板,焊接速度提高了2倍多,并且随着钨极角度的减小,焊接速度可以进一步提高,如果保护气体中引入一定量的H₂可以进一步提高不锈钢DP-TIG焊的最大焊接速度.

Study on high speed welding technology of DP-TIG

Deep Penetration TIG welding (DP-TIG welding) takes the advantage of deep penetration welding and has great advantages in the field of thick plate welding. In order to expand applications of DP-TIG welding in the field of high-speed welding of thin plates, the high-speed welding process of thin plates made of low carbon steel and stainless steel was investigated in this research by adjusting welding current, welding speed, tungsten cone angle, gas composition and other process parameters. The experimental results show that compared with conventional TIG welding, the welding speed of low carbon steel plate with 2 mm thickness is increased by 75%, and for stainless steel plate with 3 mm thickness, the welding speed is increased by more than 2 times. Moreover, with the decrease of tungsten electrode angle, the welding speed can be further improved. If a certain amount of H₂ is introduced into the shielding gas, the maximum welding speed of stainless steel DP-TIG welding may be improved further to a certain extend.