本发明公开了一种S32750超级双相不锈冷轧薄板自熔焊接方法，针对S32750超级双相不 锈钢冷轧薄板，厚度为0 .3 ~ 1 .5mm。采用Ar+6 ~ 10% N2混合气体作为焊枪保护气体，采用N2作为焊接 背面保护气体的不填丝TIG焊接方法，可有效抑制焊接过程中熔池的N逸出，并对焊接热输入加以控制，使焊缝和热影响区的奥氏体、铁素体两相比例保持在合理的范围内，保证焊接接头的耐蚀性能和力学性能不低于母材。本发明所述的方法操作简便，焊缝成形美观；实现了S32750超级 双相不锈钢冷轧薄板的高效、低成本焊接。

The invention discloses a self-fusion welding method for S32750 super duplex stainless cold-rolled sheet, which is aimed at the S32750 super duplex stainless steel cold-rolled sheet with a thickness of 0.3 to 1.5 mm. The non-filled TIG welding method using Ar+6 ~ 10% N2 mixed gas as the shielding gas for the welding gun and N2 as the shielding gas for the welding back can effectively inhibit the N escape of the molten pool during the welding process and control the welding heat input , To keep the two phase ratios of austenite and ferrite in the weld and heat-affected zone within a reasonable range to ensure that the corrosion resistance and mechanical properties of the welded joint are not lower than that of the base material. The method of the present invention is easy to operate, and the weld seam is beautifully formed; it realizes the high-efficiency and low-cost welding of the S32750 super duplex stainless steel cold-rolled sheet.