两种轨道市域车辆司机室与客室拼焊结构的焊接变形与工艺性分析OA

There are two types of interface structures between the aluminum structure at the front of the aluminum alloy track city vehicle and the passenger compartment for welding.One is to connect the aluminum structure at the front of the vehicle to the passenger compartment from the highest point of the roof to the lowest point of the side wall using a circum-ferential transition connecting plate.The other is to remove the remaining profile between the side wall connecting plate and the side wall at the door on the basis of the first structure,and use a door L-shaped material instead.The deformation trend and mechanism of the two structures after welding are consistent,with the base metal on both sides of the weld seam warp-ing outward and the weld seam sinking inward.In the width direction,the base metal at the entrance extends and bends out-ward,resulting in a decrease in flatness;Shrink downwards in the height direction,and the height of the doorway decreases;Arch in the direction of curvature.The difference in post weld deformation between the two structures is significant.The use of the L-shaped door profile instead of the remaining open side wall profile reduces the post weld deformation,with the maximum flatness value decreasing from 15.5 mm to 5 mm,the height shrinkage of the doorway decreasing from 6 mm to 2 mm,and the variation in external curvature decreasing from 6 mm to 3 mm.From the perspective of process accessibility,it is more reasonable to use L-shaped car doors as the welding interface between the driver's cab and passenger compartment of aluminum alloy track urban vehicles.