Plasma and TIG double-gun welding method applicable to nickel and nickel alloy

The invention discloses a plasma and TIG double-gun welding method applicable to nickel and a nickel alloy and aims at eliminating defects of gas holes, undercuts and incomplete fusion produced during welding of the nickel and the nickel alloy and improving the quality of nickel and nickel alloy welding connectors. Relative to the automatic walking direction of a nickel and nickel alloy cut deal or pipe (3), a plasma welding gun (1) and a TIG welding gun (2) are fixed, the plasma welding gun (1) is in front of the TIG welding gun (2), and the distance (L) between a tungsten electrode of the plasma welding gun (1) and a tungsten electrode of the TIG welding gun (2) is larger than 60 mm. 适用于镍及镍合金的等离子与TIG双枪焊接方法，其目的是消除镍及镍合金焊接时产生气孔、咬边、未熔合的缺陷，提高镍及镍合金焊接接头的质量，相对于镍及镍合金中厚板或管（3）自动行走方向，等离子焊枪（1）与TIG焊枪（2）固定不动，等离子焊枪（1）在前，TIG焊枪（2）随后，等离子焊枪（1）的钨极与TIG焊枪（2）的钨极的距离（L），距离（L）大于60mm。