Laser welding method of high-strength aluminium alloy-steel plate

A laser welding and aluminum alloy plate technology, applied in laser welding equipment, welding equipment, welding/welding/cutting items, etc., can solve the problems of affecting the laser absorption rate, large deformation of the welding structure, increasing the burden on the equipment, etc., to reduce costs , Good internal quality and appearance quality of welds, and the effect of reducing the sensitivity of hot cracks

Inactive Publication Date: 2017-09-22
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to factors such as high thermal expansion coefficient and thermal conductivity of aluminum alloy, the welding structure obtained by conventional single TIG welding and MIG welding methods has large deformation and low welding efficiency.
Due to the high laser reflectivity of aluminum alloy, it affects the absorption rate of laser light and increases the burden on equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A high-strength aluminum alloy-steel plate laser welding method, comprising the following steps:

[0030] Five-series aluminum alloys with a thickness of 2mm and martensitic stainless steel with a thickness of 2mm were respectively selected;

[0031] Grinding the surrounding area of ​​the selected aluminum alloy plate and steel plate to remove the surface oxide layer and pollutants. The grinding range is within 40-60mm around the weld, the grinding depth does not exceed 0.2mm, and the grinding lines are parallel to the direction of the weld;

[0032]Put the polished aluminum alloy plate and steel plate into ethanol for 15 minutes, and the ultrasonic power is 300W, and then put them into acetone for ultrasonic cleaning twice, the ultrasonic time is 15 minutes, and the ultrasonic power is 400W;

[0033] Align the processed plates in order and install them on the welding fixture, adjust the position of the plates so that the welding gap between the plates is 0.1mm;

[003...

Embodiment 2

[0038] A high-strength aluminum alloy-steel plate laser welding method, comprising the following steps:

[0039] The four-series aluminum alloy with a thickness of 1mm and the austenitic-ferritic duplex stainless steel with a thickness of 3mm were respectively selected;

[0040] Grinding the surrounding area of ​​the selected aluminum alloy plate and steel plate to remove the surface oxide layer and pollutants. The grinding range is within 40-60mm around the weld, the grinding depth does not exceed 0.2mm, and the grinding lines are parallel to the direction of the weld;

[0041] Put the polished aluminum alloy plate and steel plate into ethanol for 15 minutes, and the ultrasonic power is 300W, and then put them into acetone for ultrasonic cleaning twice, the ultrasonic time is 15 minutes, and the ultrasonic power is 400W;

[0042] Align the processed plates in order and install them on the welding fixture, adjust the position of the plates so that the welding gap between the p...

Embodiment 3

[0047] A high-strength aluminum alloy-steel plate laser welding method, comprising the following steps:

[0048] Second-series aluminum alloy with a thickness of 1mm and ferritic stainless steel with a thickness of 2mm are respectively selected;

[0049] Grinding the surrounding area of ​​the selected aluminum alloy plate and steel plate to remove the surface oxide layer and pollutants. The grinding range is within 40-60mm around the weld, the grinding depth does not exceed 0.2mm, and the grinding lines are parallel to the direction of the weld;

[0050] Put the polished aluminum alloy plate and steel plate into ethanol for 15 minutes, and the ultrasonic power is 300W, and then put them into acetone for ultrasonic cleaning twice, the ultrasonic time is 15 minutes, and the ultrasonic power is 400W;

[0051] Align the processed plates in order and install them on the welding fixture, adjust the position of the plates so that the welding gap between the plates is 0.1mm;

[0052]...

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Abstract

The invention relates to the technical field of laser welding, and in particular to a method for laser welding of high-strength aluminum alloy-steel plates. The method for laser welding of high-strength aluminum alloy-steel plates includes the following steps: (1) horizontally docking the aluminum alloy plate to be welded with the steel plate Place to form the parts to be welded; (2) Clamp and fix the parts to be welded at both ends so that the gap between the butt surfaces of the aluminum alloy plate and the steel plate is less than 0.1mm; (3) Coat the parts to be welded on the aluminum alloy plate and steel plate respectively. Coating with surfactant; (4) Using the spots of two laser beams to weld from both sides of the aluminum alloy / steel joint to the center. In the invention, the parts to be welded of aluminum alloy and steel plate are coated with magnesium fluoride activator, and then the spots of two laser beams are used to weld from both sides of the aluminum alloy / steel butt to the center. This method can effectively reduce the hot crack sensitivity of aluminum alloy and steel dissimilar metal welds, obtain good internal and external quality of the weld, without cracks, and can effectively reduce costs.

Description

technical field [0001] The invention relates to the technical field of laser welding, in particular to a high-strength aluminum alloy-steel plate laser welding method. Background technique [0002] Aluminum alloy is the most widely used non-ferrous metal structural material in industry, and has been widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding and chemical industry. With the rapid development of industrial economy, the demand for welded structural parts of aluminum alloy is increasing day by day, so that the research on weldability of aluminum alloy is also in-depth. Aluminum alloy is currently the most widely used alloy. The density of pure aluminum is small (ρ=2.7g / cm3), about 1 / 3 of that of iron, and its melting point is low (660°C). Aluminum has a face-centered cubic structure, so it has high plasticity (δ: 32~40%, ψ: 70~90%), easy to process, can be made into various profiles and plates, and has good corrosion resistance. Howe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/21B23K26/323B23K103/20
CPCB23K26/21B23K26/323B23K2103/20
Inventor 陈庆曾军堂陈兵
Owner CHENDU NEW KELI CHEM SCI CO LTD
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