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A laser welding method for steel/aluminum dissimilar materials

A technology of laser welding and dissimilar materials, applied in laser welding equipment, welding/cutting medium/material, welding equipment, etc., it can solve the problems of cracking, limited strength improvement of welded joints, difficult to achieve, etc., to improve metallurgical reaction and reduce protection. Gas cost and welding environmental requirements, the effect of reducing thickness

Active Publication Date: 2019-09-20
KUSN BAOJIN LASER TAILOR WELDED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the generated Ni-Al intermetallic compound is still a brittle intermetallic compound, the strength of the welded joint is only increased by 7%, and cracks still occur at the interface, which is difficult to meet the actual production requirements.

Method used

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  • A laser welding method for steel/aluminum dissimilar materials

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Comparison scheme
Effect test

Embodiment 1

[0027] A laser welding method for steel / aluminum dissimilar materials, comprising the steps of:

[0028] Step (1): Select 1.5mm thick DP590 and AA6061 aluminum alloys, and use acetone to degrease;

[0029] Step (2): Pre-preparing Ni / B mixed powder with a thickness of 0.06mm on the surface of the cleaned AA6061 aluminum alloy, with a particle size of 20nm to 200μm;

[0030] Step (3): Place the treated steel plate and aluminum alloy on the workbench in the form of a steel upper aluminum lower overlap, and use a special welding fixture to make the two steel plates closely contact.

[0031] Step (4): Use the IPG-6kW fiber laser to perform lap welding on the test plate, and the shielding gas is 95% Ar+5% CO 2 / O 2 mixed composition.

[0032] After welding, the macroscopic appearance of the weld was observed to be excellent, without obvious spatter, Ni-Al intermetallic compound was precipitated at the interface, the thickness of the Fe-Al intermetallic compound layer was about 20...

Embodiment 2

[0034] Step (1): Select 1.5mm thick DP590 and AA6061 aluminum alloys, and use acetone to degrease;

[0035] Step (2): Pre-preparing Ni / B mixed powder with a thickness of 0.1 mm on the surface of the cleaned AA6061 aluminum alloy, with a particle size of 20 nm to 200 μm;

[0036] Step (3): Place the treated steel plate and aluminum alloy on the workbench in the form of a steel upper aluminum lower overlap, and use a special welding fixture to make the two steel plates closely contact.

[0037] Step (4): Use the IPG-6kW fiber laser to perform lap welding on the test plate, and the shielding gas is 85% Ar+15% CO 2 / O 2 mixed composition.

[0038] After welding, the macroscopic appearance of the weld seam is excellent, there is no obvious spatter, the precipitation of Ni-Al intermetallic compound at the interface increases significantly, the thickness of the Fe-Al intermetallic compound layer is about 10 μm, and the strength of the welded joint reaches 120MPa

[0039]The main p...

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Abstract

The invention discloses a laser welding method for a steel / aluminum dissimilar material. According to the laser welding method, an Al2O3 oxidation layer on the surface of an aluminum alloy does not need to be removed, and a Ni / B powder mixture is prearranged on the surface of the aluminum alloy, wherein the mass percentage of B powder ranges from 5% to 15%; laser welding is conducted in the atmosphere of inert gas mixed with a CO2 / O2 gas mixture or air, so that the metallurgical reaction in a molten pool is improved through Ni in the Ni / B powder mixture, occurrence of the Fe-Al metallurgical reaction is effectively hindered, and a Fe-Al intermetallic compound at an interface of a welding joint is inhibited from being separated; the B powder is molten and enters the welding molten pool, sothat toughness of an Al-Ni intermetallic compound generated after the Ni is added is improved; either or both of O2 or CO2 are adopted to be mixed with the inert gas, or welding is conducted directlyin a pure air environment, so that the oxygen partial pressure of the welding molten pool is increased, and an element Al and an element O entering the molten pool are combined to form Al2O3 which does not affect the toughness of the welding joint; the thickness of the Fe-Al intermetallic compound at the interface is reduced, and strengthening and toughening of the steel / aluminum dissimilar welding joint are achieved; and the high-quality laser welding joint is obtained.

Description

technical field [0001] The invention relates to the technical field of welding of steel / aluminum dissimilar materials, in particular to a laser welding method of steel / aluminum dissimilar materials. Background technique [0002] In today's energy shortage and increasingly serious environmental pollution, new energy vehicles have become the future development trend of the automotive industry. The development of new energy vehicles in my country is of great significance to the entire automobile industry, and even to the adherence to the road of new industrialization and the construction of a resource-saving and environment-friendly society. Among all new energy vehicles, pure electric vehicles driven by pure energy are currently the most popular. The market welcomes it. However, for electric vehicles, battery life is the key to their industrialization and marketization. Battery technology is one of the decisive technologies that determine the battery life of electric vehicles...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/21B23K26/14B23K26/60B23K35/30B23K35/36
Inventor 王晓南陈夏明胡增荣王高松颜倩杨蕾陈长军张敏章顺虎周健
Owner KUSN BAOJIN LASER TAILOR WELDED