Ultrasonic-assisted laser welding method for steel wheel rim

Abstract

The invention provides an ultrasonic-assisted laser welding method for a steel wheel rim. The ultrasonic-assisted laser welding method comprises the following steps: (1) carrying out grinding, cleaning and edge rolling treatment on a to-be-welded steel plate; (2) placing a treated to-be-welded circular steel ring on a welding clamp for butt joint and clamping fixing, and arranging a gas protection device with the same radian as the steel ring on the back face of a butt joint seam of the steel ring; (3) adjusting the acting positions of laser beams and ultrasonic waves; and (4) carrying out welding according to set technological parameters, completely fusing the back face of the welding seam to ensure double-face forming by single-face welding, and introducing inert gas in the welding process for protecting the back face of a molten pool. According to the welding method, the peak temperature of the molten pool in the welding process can be increased, the laser power in the welding process is reduced, the pore defect in the welding seam is reduced, and a steel wheel rim welding joint with good forming and high elongation is obtained.

Description

Technical field [0001] The invention relates to an ultrasonic-assisted laser welding method for steel wheel rims, belonging to the technical field of wheel welding and manufacturing. Background technique [0002] As one of the most important parts of a car, wheels play a role in supporting the weight of the car body and transmitting power. They are of great significance to the safety and comfort of the car while driving. The wheels currently used in production are mainly divided into aluminum wheels and steel wheels. Today, most domestic passenger cars use aluminum wheels, accounting for about 70%, while among commercial vehicles, about 70% use steel wheels. Compared with aluminum wheels, steel wheels have the advantages of high strength, good toughness, and durability, and their application range is still very wide. Since the failure parts of steel wheels are mainly located in or near the welding area, how to obtain high-quality welding joints has become an issue that can...

AI Technical Summary

Problems solved by technology

However, due to the serious overheating in the process of laser welding wheel steel, a large amount of martensite is formed at the welded joint, the elongation of the joint is significantly lower than that of the base metal, and defects such as pores are prone to appear in the weld area, which reduces the mechanical strength of the joint. performance

In addition, due to the high price of high-power lasers, the welding cost is relatively high, which is the deficiency of the existing technology

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