Simulation on welding process of bow half pipe jacket

The arched half pipe jacket corresponding to 120° center angle was taken as the research object, and simplified model of jacket and kettle body was established. SYSWELD welding software was used to analyze heat transfer of jacket model with the inner and outer angle bisector groove and without groove, and then temperature field was output as the predefined residual stress field to study variation law of welding stress field emphatically. The results showed that the root of arcuate half pipe jacket with outer angle bisector groove was easier to weld through, and peak value of residual Mises stress was the smallest. During welding of half pipe jacket in engineering, jacket should be separated from cylinder by a certain distance, so that more welding materials could flow into weld, and residual stress in the direction of thickness of cylinder can be reduced. Combined with residual stress analysis on three paths of weld, it was concluded that arcuate half pipe jacket with outer angle bisector groove had better applicability.