超级双相不锈钢S32750深熔TIG焊接工艺研究

Study on Deep Penetration Tungsten Inert Gas Welding Procedure of Super Duplex Stainless Steel S32750

为提高薄壁、大直径压力容器产品的焊接效率,研究了5 mm厚超级双相不锈钢S32750的深熔非熔化极惰性气体保护电弧焊(TIG)焊接工艺。通过焊接试验和工艺评定确定了S32750的焊接工艺参数,对焊接接头进行了力学性能试验和腐蚀试验。试验结果表明,对厚度5 mm的S32750不开坡口进行焊接,深熔TIG焊接可实现一次熔透,并获得质量可靠的焊接接头,可大幅提高薄壁、大直径超级双相不锈钢压力容器的生产效率。

In order to improve the welding efficiency of thin walled and large diameter pressure vessels products,the deep penetration tungsten inert gas(TIG)welding procedure of 5 mm S32750 super duplex stainless steel was studied.The welding procedure parameters were determined through welding tests and procedure qualification,and mechanical performance tests and corrosion tests were conducted on the welded joints.The results indicate that,deep penetration TIG welding can achieve one-time penetration and obtain reliable welding joints for 5 mm S32750 super duplex steel without groove.It can greatly improve the production efficiency of thin walled and large diameter super duplex stainless steel pressure vessels.