Double-beam laser deep penetration brazing method applicable to moderately thick plate aluminum/steel dissimilar alloy connection

A brazing method and double-beam technology, applied in the direction of welding/welding/cutting articles, welding equipment, metal processing equipment, etc., to achieve the effect of improving wetting and spreading, inhibiting the formation of brittle intermetallic compounds, and high-quality connection

Inactive Publication Date: 2017-03-22
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The present invention aims at the high-efficiency and high-quality connection requirements of steel/aluminum dissimilar alloys for medium-thick plates (above 6mm) used in ships, and the problems existing in single laser fusion

Method used

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  • Double-beam laser deep penetration brazing method applicable to moderately thick plate aluminum/steel dissimilar alloy connection
  • Double-beam laser deep penetration brazing method applicable to moderately thick plate aluminum/steel dissimilar alloy connection
  • Double-beam laser deep penetration brazing method applicable to moderately thick plate aluminum/steel dissimilar alloy connection

Examples

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Effect test

example 1

[0022]Example 1: The YLS-6000 fiber laser produced by IPG is used, the laser wavelength is 1070nm, the offset of the double-beam laser from the steel and aluminum interface layer is 0.6mm, the welding speed is 1.0m / min, and the defocus is 0mm. Dual-beam lasers are focused on one side of the steel plate. The base metal used in the test is 6mm 5083 marine aluminum alloy plate and 6mm thick Q235 steel plate, and the sample size is 150mm. The total power of the double-beam laser is 3250W, and the energy ratio of the two beams is 250W:3000W. figure 2 It is a welding example diagram of pre-welding pretreatment with low power. It can be found that the interface between aluminum and steel is flush. The inhomogeneity of the intermetallic compound in some areas of the interface is improved, and the thickness of the intermetallic compound is 5.02 μm, which effectively inhibits the growth of the intermetallic compound. The hardness value between the interfaces is 714.6HV, which effect...

example 2

[0023] Example 2: Using YLS-6000 fiber laser produced by IPG Company, the laser wavelength is 1070nm, the offset of the double beam laser from the steel and aluminum interface layer is 0.6mm, the welding speed is 1.0m / min, and the defocus is 0mm. Dual-beam lasers are focused on one side of the steel plate. The base metal used in the test is 6mm 5083 marine aluminum alloy plate and 6mm thick Q235 steel plate, and the sample size is 150mm. The total power of the double-beam laser is 3250W, and the energy ratio of the two beams is 250W:3000W. The test uses a low-power laser to perform post-weld heat treatment after welding. image 3 Its welding example diagram. It can be found that when the post-weld heat treatment is performed with low power, the weld seam is well formed, the amount of liquid aluminum alloy is increased, and the brazing quality is improved by prolonging the wetting and spreading time of aluminum alloy. The intermetallic compound is relatively uniform, the int...

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Abstract

The invention provides a double-beam laser deep penetration brazing method applicable to moderately thick plate aluminum/steel dissimilar alloy connection, and belongs to the field of laser machining of dissimilar alloy connection. According to the double-beam laser deep penetration brazing method, two laser beams with different forms of energy are arranged in series, and act on the steel side; through the main laser beam, deep penetration is achieved on the steel side; a solid-state steel intermediate layer is acquired by controlling the offset dp of the laser beams with a steel/aluminum interface and the heat input on a regulating joint interface, the heat input for welding is transferred through the solid-state steel intermediate layer, an aluminum alloy is molten, and the molten aluminum alloy is wetted and spread, thereby achieving laser deep penetration brazing of an aluminum/steel dissimilar alloy; when the auxiliary laser beam goes before, the stability of laser deep penetration welding is improved and the effect of preheating treatment before welding is achieved; and when the auxiliary laser beam follows after, the wetting and spreading properties of aluminum are improved, and the effect of heat treatment after welding on the joint interface is achieved. By adoption of the double-beam laser deep penetration brazing method provided by the invention, the distribution of welding temperature fields can be controlled, the interfacial intermetallic compound distribution and thickness uniformity can be improved, and the high-quality and efficient dissimilar alloy connection can be achieved.

Description

technical field [0001] The invention is a double-beam laser deep-penetration brazing method. Double-beam laser deep penetration welding, as an improvement to traditional deep penetration brazing, belongs to the field of laser processing for joining dissimilar alloys. Background technique [0002] Aluminum and its aluminum alloys have excellent processability and corrosion resistance, and have been widely used in manufacturing industries such as aviation, aerospace, ships, and automobiles. However, steel has higher strength, better processing and welding performance, and has always been in a dominant position in the manufacturing industry. With the application of more and more aluminum and aluminum alloy structural parts in the manufacturing industry, the connection of steel and aluminum has become a hot issue that people pay attention to. [0003] In terms of shipbuilding, more and more ships use aluminum alloy to manufacture superstructures, thereby reducing their own wei...

Claims

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Application Information

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IPC IPC(8): B23K1/005B23K1/19B23K1/20B23K1/14B23K103/20
CPCB23K1/0056B23K1/14B23K1/19B23K1/206B23K2103/20
Inventor 崔丽陈勃旭潘峰贺定勇王智慧王国红
Owner BEIJING UNIV OF TECH
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