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Micro-vibration auxiliary laser lap welding method for aluminum-silicon coating hot forming steel

A hot-formed steel and laser-assisted technology, which is applied in laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of reducing the quality of joints and lack of non-destructive testing methods for joints, so as to improve mechanical properties, reduce welding defects, and alleviate The effect of plating aggregation

Pending Publication Date: 2021-08-17
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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)

Method used

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  • Micro-vibration auxiliary laser lap welding method for aluminum-silicon coating hot forming steel

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Embodiment 1

[0031] The micro-vibrating laser mount welding method of the aluminum silicone plating heat forming steel of the present embodiment includes:

[0032] Aluminous silicon coating, pretreated aluminum silicone plating, according to the pre-welded pretreatment figure 1 The assembly is shown to form a lap joint, and the aluminum silicon coating heat shaped steel is mounted by a laser feed wire. The length of the welding is 10 mm, and the gap of the weld is 0.1 mm. The vibration frequency of the microscopic device is 1300 Hz in a microscopic process, and the amplitude is 0.1 mm. The incident angle of the laser is 85 °. In the laser welding process, the welding process parameters are: the power of the laser is 2 kW, and the rate of welding is 1 m / min. When argon is protected, the flow rate of argon is 15 L / min.

[0033] After welding, the entire weld is observed is good, no splash, and is a full melt weld. The center of the weld is martensite and a very small amount of ferrite; the h...

Embodiment 2

[0035] The micro-vibrating laser mount welding method of the aluminum silicone plating heat forming steel of the present embodiment includes:

[0036] Aluminous silicon coating, pretreated aluminum silicone plating, according to the pre-welded pretreatment figure 1The assembly is shown to form a lap joint, and the aluminum silicon coating heat shaped steel is mounted by a laser feed wire. The length of the weld is 5 mm, and the gap of the weld is 0.1 mm. The vibration frequency of the microscopic device is 500 Hz in a slight vibration process, an amplitude of 0.1 mm. The incident angle of the laser is 85 °. In the laser welding process, the welding process parameters are: the power of the laser is 2 kW, and the rate of welding is 1 m / min. When argon is protected, the flow rate of argon is 15 L / min.

[0037] After welding, the entire weld is observed is good, no splash, and is a full melt weld. The center of the weld is martensite and a small amount of ferrite; the thermal infl...

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Abstract

The invention provides a micro-vibration auxiliary laser lap welding method for aluminum-silicon coating hot forming steel. A laser welding process is adopted, auxiliary micro-vibration is used in the welding process, and a well-formed aluminum-silicon coating hot forming steel laser lap welding seam can be obtained. According to the method, laser process parameters are controlled, a mechanical vibration external field is applied on the basis, and vibration parameters are adjusted, so that the aggregation degree of an aluminum coating dissolved in the welding seam is effectively reduced, the structure of the welding seam is optimized, and welding defects are reduced, so that a high-quality lap welding joint is obtained, and the method is suitable for welding of the aluminum-silicon coating hot forming steel for automobiles; and compared with a traditional laser lap joint method, an aluminum-silicon coating on the surface of the hot forming steel does not need to be removed, the lap joint welding technological process is simplified, the production efficiency is improved, meanwhile, due to application of mechanical vibration, the aggregation degree of the aluminum coating in the welding seam is relieved, grains are refined, the residual stress of the joint is reduced, and the strength of the lap welding joint is improved.

Description

Technical field [0001] The present invention belongs to the field of laser welding technology, and more particularly to a micro-vibrating auxiliary laser mount welding method of aluminum silicon plating heat forming steel. Background technique [0002] With the intensification of energy shortage and environmental pollution, the automotive industry is facing increasingly severe challenges, and the automotive manufacturing is lightweight is an important direction in the development of the automotive industry, and the purpose of reducing the weight of the car is achieved. Car light weight refers to the premise of ensuring the strength and safety performance of the car, reducing the own weight of the car as much as possible, improving the power of the car, reducing the power consumption, and reducing pollution by optimizing the structure and material as much as possible. Although some lightweight materials such as aluminum alloy, magnesium alloys, titanium alloys, composites and carb...

Claims

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Application Information

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IPC IPC(8): B23K26/12B23K26/21B23K26/70
CPCB23K26/21B23K26/702B23K26/123
Inventor 秦优琼梁敏张丹峰赵峰
Owner SHANGHAI UNIV OF ENG SCI
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