Welding process for rear overhang rack

Abstract

The invention relates to a welding technique of a back suspension fork of an automobile; a reinforced plate is connected with a dragging arm; the invention is characterized in that the head part of a welding line is welded with a smooth arc and then is transited to the bottom side of the dragging arm; the welding technique of the invention has the advantages of removing the heat treatment after the welding and eliminating welding residual stress of the welding joint of the reinforced plate, thereby simplifying the technique during manufacture, being easy to control the quality, improving the fatigue strength of a product and reducing the manufacturing cost.

Description

technical field [0001] The invention relates to a welding process of an automobile rear suspension, in particular to a welding process of an automobile rear suspension-trailing arm, which further improves the fatigue strength of the suspension system and belongs to the technical field of welding processes. Background technique [0002] In China, in order to meet the requirements of a car chassis and increase the strength of the rear suspension-trailing arm, a reinforcing plate is added to the rear suspension-trailing arm of the car, and the reinforcing plate and the trailing arm are welded. [0003] The welding process between the reinforcement plate and the drag arm body has the following characteristics: [0004] 1. When the reinforcing plate and the dragging arm are welded, the starting and closing positions of the arc are sealed and welded; [0005] 2. When welding the reinforcing plate and the dragging arm, there is a margin of 12mm between the starting and ending posi...

AI Technical Summary

Problems solved by technology

[0007] 1. The stress concentration point is ignored during the test loading;

[0008] 2. The welding heat affected zone is ignored;

[0012] It is generally believed that the residual stress of welding is equivalent to the average stress, and the tensile residual stress is equivalent to a tensile average stress, which reduces the fatigue strength, and the measure to eliminate the residual stress is to carry out heat treatment on the components, but for the complex heat treatment is difficult

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