随着低合金高强度钢大型结构物的增加,采用高质高效的全位置焊接法就显得更有必要。GTA自动焊是满足上述要求的工艺方法之一,因此,在日本,现场焊接9%Ni钢液化天然气贮罐之类的大型钢结构,已应用了这种方法。然而,常规的GTA自动焊由于效率很低,而尚未广泛应用于大型结构物的制造。 With the increase of low-alloy high-strength steel large structure, the use of high quality and efficient all-position welding method is even more necessary. GTA automatic welding is one of the processing methods to meet the above requirements. Therefore, this method has been applied to large steel structures such as 9% Ni steel liquefied natural gas tanks welded on site in Japan. However, conventional GTA automatic welding has not been widely applied to the manufacture of large structures because of its low efficiency.