Laser wire feeding welding method for aluminum-silicon-coated hot formed steel

Abstract

The invention provides a laser wire feeding welding method for aluminum-silicon-coated hot formed steel. A well formed aluminum-silicon-coated hot formed steel laser wire feeding lap weld can be obtained by adopting a high-strength steel welding wire to perform laser wire feeding welding on the aluminum-silicon-coated hot formed steel. For the laser wire feeding welding method provided by the invention, by selecting a high-strength steel welding wire as a proper filling material, a laser wire feeding process is controlled to dilute an aluminum coating dissolved in the weld through the fillingmaterial, such that a weld microstructure is controlled, a high-quality lap joint welding head is obtained, and meanwhile, the laser wire feeding welding method is also suitable for aluminized siliconhot formed steel welding for an automobile. Compared with a traditional laser lap joint method, by adopting the laser wire feeding welding method provided by the invention, without removing an aluminum-silicon coating on the surface of the hot formed steel, the lap welding process flow is simplified, and the production efficiency is improved; and meanwhile, due to the fact that the welding wire is dissolved, the problem of surface collapse easily caused by self-welding is solved, and the weld is full, such that the strength of the lap joint welding head is improved, that is the mechanical property of the lap joint is improved.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and in particular relates to a laser wire-feeding welding method for aluminum-silicon-coated hot-formed steel. Background technique [0002] With the intensification of energy shortage and environmental pollution, the automobile industry is facing increasingly severe challenges. The lightweight of automobile manufacturing is an important direction for the development of the automobile industry. The purpose of energy saving and emission reduction can be achieved by reducing the weight of automobiles. Automobile lightweight refers to reducing the weight of the car as much as possible by optimizing the structure and materials under the premise of ensuring the strength and safety performance of the car, improving the power of the car, reducing fuel consumption, and reducing pollution. Although some lightweight materials, such as aluminum alloys, magnesium alloys, titanium alloys, co...

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Problems solved by technology

Resistance spot welding cannot be closed-type welding, and the quality of the joint lacks a suitable non-destructive testing method

Although pure laser can perform high-efficiency welding, the quality of the joint is reduced due to the aluminum coating entering the weld. For example, the strength of the C Kim pure laser lap welding joint in South Korea is 335MPa, which is 22% of the strength of the base metal (C.Kim, M.J.Kang ,Y.D.Park.Laser welding of Al-Si coated hot stamping steel.Procedia Engineering,2011,10:2226-2231), Shanghai Jiaotong University Hua Xueming research group reported pure laser lap welding of Al-Si coated hot stamping steel joint tensile strength The strength is about 375MPa, which is 25% of the base metal (Zhang Fan. Research on the influence of coating on the process of high-strength steel fiber laser welding and joint performance. Shanghai Jiaotong University, 2015)

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