奥氏体不锈钢管子-管板焊接熔敷顺序的研究

Study of build-up sequence of austenite stainless steel tube-tubesheet welding

分析了奥氏体不锈钢换热管与管板焊接的熔敷顺序,采用相同的母材材质和规格、相同的焊接参数,分别采用先自熔后填丝、先填丝后自熔以及单层焊(填丝)三种熔敷顺序进行了焊接试验。并通过对三种焊缝接头的角测量实验、宏微观试验、铁素体试验以及拉脱力试验等对比试验发现,如果采用先自熔后填丝的熔敷顺序,第一层电弧直接对坡口根部加热,有利用根部熔合和增加熔深,保证密封性能,第二层填丝方式可以保证接头的强度;而先填丝后自熔熔敷顺序的优点是第一层保证接头性能和密封性,第二层电弧可以优化第一层焊缝,同时修饰焊缝,焊缝成形美观。无论哪一种熔敷顺序,都可以满足管子-管板焊接的标准要求。

The build-up sequence of austenite stainless steel tube-tubesheet welding is analyzed in this paper,and the experiences of no-filler plus filler,filler plus no-filler and filler with the same material and specifications are conducted.By comparing the test results showed that, the first layer are heat the grooves directly if no-filler plus filler is used, that is in favor of penetration and enhancement of weld, then sealing is guaranteed.And the second layer mainly ensures weld strength.If filler plus no-filler is used, the first layer ensures weld strength and sealing,while the second layer arc optimize and smooth the first layer.No matter what kind of the sequence is,the correlative codes are met.