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对设计温度为-90℃以上的3．5镍钢或设计温度为-104℃以上的调质3．5镍销施焊，应以熔化极情性气体保护焊（以下简称MIG）为主，手工电弧炉（以下简称MAW）为辅，而熔剂层下埋弧焊（以下简称SAW）则不宜采用。
For the design temperature of -35 ℃ above 3.5 nickel steel or design temperature of -104 ℃ quenched and tempered 3.5 Ni pin welding should be melted extremely gas shielded welding (hereinafter referred to as MIG) based, Manual electric arc furnace (hereinafter referred to as MAW) supplemented, and flux layer submerged arc welding (hereinafter referred to as SAW) is not suitable for use.