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A kind of dissimilar metal micro-welding method

A welding method and technology of dissimilar metals, applied in welding equipment, laser welding equipment, metal processing equipment, etc., can solve the problems of reduced mechanical properties of welded joints, large differences in physical properties, and high production costs, avoiding micro-cracks and small size. , the effect of improving the welding strength

Active Publication Date: 2018-12-28
HANS LASER TECH IND GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some electronic products, aluminum alloys are mainly used to manufacture shells, and stainless steel is commonly used for internal structural parts. For the connection between stainless steel and aluminum dissimilar metals, traditional processes use resistance welding, friction stir welding, etc., but such methods have high production costs. The efficiency is low, and it is urgent to replace it with a new welding process in production
[0003] The reliable connection of steel and aluminum dissimilar metals has always been a difficult point in the welding process. The main reason is that the physical properties of steel and aluminum are greatly different, the mutual solubility is low, and steel and aluminum are very easy to form iron-aluminum brittle intermetallic compounds. These compounds make the mechanical properties of welded joints greatly reduced performance

Method used

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  • A kind of dissimilar metal micro-welding method
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  • A kind of dissimilar metal micro-welding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0036] Such as figure 1 As shown, the high-speed scanning oscillating head adopts the filling line high-speed scanning method: first scan along the continuous horizontal line a direction, and then scan along the continuous vertical line b direction to form solder joints when the molten pool metal is not completely solidified after the previous welding ; Or first scan along the continuous vertical line b direction, and then scan along the continuous horizontal line a direction to form solder joints when the molten pool metal is not completely solidified after the previous welding. Wherein, the distance between the horizontal lines a is the same as the distance between the vertical lines b, so that the scanning welding is relatively uniform, which is conducive to the formation of solder joints with better mechanical capabilities.

[0037] Specifically, when welding 316L stainless steel with a thickness of 0.15 mm and a 6063 aluminum alloy plate with a thickness of 0.6 mm, a nano...

Embodiment approach 2

[0040] Such as Figure 4As shown, the high-speed scanning oscillating head adopts the helical high-speed scanning method: first scan along the smaller-diameter helix to form the first circular solder spot, and then scan along the larger-diameter helix when the metal in the molten pool is not completely solidified after the previous welding. Scanning forms a second circular solder joint, and the circular solder joints formed by the two scans overlap each other. In this embodiment, the diameter of the smaller helix is ​​0.5 mm, the diameter of the larger helix is ​​0.7 mm, the energy of the previous scan is greater than the energy of the next scan, and the above helixes are formed from inside to outside. The previous welding energy is greater than the subsequent welding energy, so the thermal influence is greater than that of the latter, the previous welding trajectory is smaller than the latter welding trajectory, and the size of the solder joints formed in the final two times ...

Embodiment approach 3

[0043] Such as Image 6 As shown, the high-speed scanning vibrating head adopts a spiral progressive high-speed scanning method: scan a circle around the center point in a spiral manner to form solder joints. During the aluminum-steel dissimilar metal welding process, a large number of brittle (Fe, Al) intermetallic compound layers will be formed near the fusion line, and the thermal expansion coefficient of aluminum-steel has a large difference. During the aluminum-steel welding process, a large thermal stress is generated near the fusion line and acts on the brittle intermetallic compound layer to cause thermal cracks. Direct welding with a large heat input will increase the penetration depth and fusion width of the weld, and the increase of the interface joint surface will improve the mechanical properties of the joint. However, due to the violent reaction between metal atoms in the molten pool, a large number of brittle compounds are generated. Larger internal stress is g...

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Abstract

The invention relates to a dissimilar metal micro welding method comprising following steps: A1. an aluminum alloy plate and a stainless steel plate are compressed and fixed by a clamp; A2. a nanosecond laser or a microsecond laser is matched with a high speed scanning galvanometer; the high speed scanning galvanometer controls laser to perform scanning welding on the aluminum alloy plate and the stainless steel plate so that welding spots are formed between the aluminum alloy plate and the stainless steel plate, wherein the welding spots are embedded in the aluminum plate in a tooth like mode. Taking the advantages of extremely short pulse width and low energy of the nanosecond laser or the microsecond laser and by means of high speed scanning mode, the generation of the (Fe, Al) intermetallic compound between the aluminum alloy plate and the stainless steel plate is reduced by accurately controlling heat input so as to avoid micro cracks in welding joints. Besides, the welding spot roots are embedded in the aluminum plate in a tooth like mode; the (Fe, Al) intermetallic compound is distributed along the tooth root with interruptions; the size is reduced; the cracks are reduced compared with traditional welding method; the welding strength is obviously increased.

Description

technical field [0001] The invention relates to the technical field of laser welding, in particular to a dissimilar metal micro-welding method for welding stainless steel and aluminum metal sheets. Background technique [0002] Because aluminum alloy has the advantages of light weight, low density, good elasticity and plasticity, high specific strength, wear resistance, corrosion resistance, good electrical and thermal conductivity, and excellent processing performance, it is widely used in various industries. In some electronic products, aluminum alloys are mainly used to manufacture shells, and stainless steel is commonly used for internal structural parts. For the connection between stainless steel and aluminum dissimilar metals, traditional processes use resistance welding, friction stir welding, etc., but such methods have high production costs. The efficiency is low, and it is urgent to replace it with a new welding process in production. [0003] The reliable connect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/21B23K26/082B23K26/0622B23K26/60B23K103/20
CPCB23K26/0624B23K26/082B23K26/21B23K26/60B23K2103/20
Inventor 朱宝华李小婷王瑾高云峰
Owner HANS LASER TECH IND GRP CO LTD
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