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Laser-magnetic field compound melt brazed welding method for aluminum alloy/steel

A welding method and technology of aluminum alloy, applied in welding equipment, welding/welding/cutting items, metal processing, etc., can solve the problems of uneven structure and low connection strength of the joint surface, and achieve the effect of high connection strength

Inactive Publication Date: 2018-11-23
WUHAN UNIV OF TECH
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Problems solved by technology

[0009] The purpose of the present invention is to solve the technical problems of uneven structure and low connection strength of the joint surface in aluminum alloy / steel laser welding and brazing. The present invention provides a method for aluminum alloy / steel laser-magnetic field composite welding and brazing

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  • Laser-magnetic field compound melt brazed welding method for aluminum alloy/steel

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Embodiment Construction

[0032] Below in conjunction with accompanying drawing and specific embodiment the present invention will be described in further detail:

[0033] In view of the above-mentioned technical problems of aluminum alloy / steel laser welding and brazing, such as uneven structure and low connection strength of the joint surface, the present invention provides a method for aluminum alloy / steel laser-magnetic field composite welding and brazing, which includes the following steps:

[0034] S1 cleans and fixes the aluminum alloy and steel plate to be overlapped;

[0035] S2 selects the laser energy according to the required welding thickness, and selects zinc-aluminum alloy or aluminum-silicon alloy welding wire 4 as the filler metal; in the present invention, zinc-aluminum alloy is selected, and the presence of zinc can improve the spreadability and wetting of the liquid metal at the steel-aluminum interface sex.

[0036] S3 controls the wire feeding speed of the welding torch 2 and the...

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Abstract

The invention discloses a laser-magnetic field compound melt brazed welding method for an aluminum alloy / steel. The method comprises the following steps: cleaning and fixing the aluminum alloy and a steel plate to be overlapped; selecting laser energy according to needed welding thickness and selecting a zinc-aluminum alloy welding stick as filling metal; and controlling the wire feeding velocityand parameters of an alternating magnetic field to form a welding structure in zigzagged connection on an overlapped face of the aluminum alloy and the steel plate. By regulating the shape of a melt brazed joint by means of a synergistic effect of laser and magnetic field, the thickness of a brittle intermetallic compound at the interface is regulated by precisely controlling the laser ray energy,and meanwhile, solute segregation in a welding joint area and an interface layer is inhibited by means of action of the alternating magnetic field and tissues in the welding joint area and on the interface are refined, so that thickness, tissues and shape of the brittle intermetallic compound at the interface are controlled effectively, and a dissimilar alloy welding joint good in formation and performance is obtained.

Description

technical field [0001] The invention relates to the field of welding, in particular to an aluminum alloy / steel laser-magnetic field composite welding method. Background technique [0002] Aluminum alloy is light in weight, has good thermal conductivity and good corrosion resistance, while steel, as the main traditional material in the manufacturing industry, has high strength, good toughness and plasticity, and wide applicability. The aluminum alloy / steel composite structure can not only give full play to the advantages of both, but also reduce the overall weight of the manufactured product under the premise of ensuring performance. Therefore, it has broad application prospects in major national economic fields such as aerospace, mechanical equipment, and rail transportation. [0003] Conventional mechanical connections (such as riveting, bolting, etc.) can realize the macroscopic connection of aluminum alloy / steel, but the composite structure has poor air tightness or surfa...

Claims

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Application Information

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IPC IPC(8): B23K1/00B23K1/20B23K1/16B23K1/19B23K103/20B23K101/18
CPCB23K1/00B23K1/16B23K1/19B23K1/206
Inventor 闫飞王玮柴方
Owner WUHAN UNIV OF TECH
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