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In order to ensure the welding quality of 7 layers of 0.5-thk 304L bellows and flange, the welding process was studied, and the evolution rules of weld zone forming, mechanical properties and microstructure under four different process conditions are analyzed to determine the best welding process. The results show that the four kinds of welding conditions can obtain the welded joint with good appearance, but the macro fracture analysis shows that for the welding of 7x0.5 bellows, 2mm double-layer welding is the best welding method. At this time, the distance between the outer wall of the bellows and the inner wall of the flange is the smallest, and the penetration is the largest; For the combination welding method of seam welding and fusion welding, the hardness of the seam welding area is the highest, followed by that of the fusion welding area, because the seam welding area is mainly small equiaxed distance, while the fusion welding is mainly coarse columnar crystal.

Study on Welding Process of 7×0.5 Multilayer 304 Bellows and Flange