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Invar and aluminum alloy dissimilar metal electron beam welding method

A technology of electron beam welding and Invar alloy, applied in the direction of electron beam welding equipment, welding equipment, metal processing equipment, etc., can solve the problem of large difference in linear expansion coefficient and chemical properties between tile alloy and aluminum alloy, high stress intermetallic compound, Reduce problems such as joint mechanical properties, achieve the effects of reducing mismatch, reducing complexity, and inhibiting post-weld cracking

Active Publication Date: 2019-10-01
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, due to the large difference in linear expansion coefficient and chemical properties between Invar alloy and aluminum alloy, high residual stress and a large amount of intermetallic compounds are easily formed in the joint after welding. Joints, after welding, a large number of cracks are generated inside and on the surface of the joints, which reduces the mechanical properties of the joints

Method used

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  • Invar and aluminum alloy dissimilar metal electron beam welding method
  • Invar and aluminum alloy dissimilar metal electron beam welding method
  • Invar and aluminum alloy dissimilar metal electron beam welding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The electron beam butt joint test was carried out on the Invar alloy with a thickness of 2mm and the aluminum alloy with a thickness of 4mm. The middle layer of steel is cut into strips of 50mm×10mm×2mm, and the base material and the middle layer are polished with No. 200 sandpaper until they are bright. Ultrasonic cleaning equipment is used to clean and remove oil stains in industrial alcohol. After drying in a clean drying cabinet, the middle layer is butted with Invar and put into a vacuum chamber. Surface focusing is used during spot welding, spot solid beam current is 1mA, spot solid position interval is 5mm, acceleration voltage is 60kV, surface focusing is used for formal welding, welding speed is 480mm / min, electron beam current is 6mA, and it is cooled in a vacuum chamber after welding After 5 minutes, open the vacuum chamber and take out the welded components. Use wire cutting to cut the side of the middle layer between the welded Invar alloy and the middle ...

Embodiment 2

[0060] The electron beam butt joint test was carried out on the Invar alloy with a thickness of 3mm and the aluminum alloy with a thickness of 5mm. The middle layer of steel is cut into strips of 50mm×10mm×3mm, and the base material and the middle layer are polished with No. 200 sandpaper until they are bright. Ultrasonic cleaning equipment is used to clean and remove oil stains in industrial alcohol. After drying in a clean drying cabinet, the middle layer is butted with Invar and put into a vacuum chamber. Surface focusing is used during spot welding, spot solid beam current is 1mA, spot solid position interval is 5mm, acceleration voltage 60kV is used for formal welding, surface focusing is used, welding speed is 480mm / min, electron beam current is 8mA, and it is cooled in a vacuum chamber after welding After 5 minutes, open the vacuum chamber and take out the welded components. Use wire cutting to cut the side of the middle layer between the welded Invar alloy and the mi...

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Abstract

The invention belongs to the field of material melting welding and particularly relates to an invar and aluminum alloy dissimilar metal electron beam welding method. Electron beams are adopted as theheat source, an intermediate layer is added between invar and aluminum alloy, electron beam welding between the intermediate layer and the invar is performed first in a two-step butt welding mode, andthen electron beam welding between the intermediate layer and the aluminum alloy is performed; and the material of the intermediate layer is a material which does not react with the invar to generateintermetallic compounds, and the linear expansion coefficient of the material falls in between those of the invar and the aluminum alloy. According to the invar and aluminum alloy dissimilar metal electron beam welding method, the intermediate layer made of steel or copper or a metal which does not react with the invar to generate brittle intermetallic compounds is added, the complexity of metallurgical reaction between the invar and an aluminum joint can be reduced, ternary metallurgical reaction or polybasic metallurgical reaction is converted into binary metallurgical reaction, and the metallurgical regulation difficulty is reduced.

Description

technical field [0001] The invention belongs to the field of material fusion welding, in particular to an electron beam welding method for dissimilar metals of Invar alloy and aluminum alloy. Background technique [0002] Invar alloy is an iron-based alloy containing 35.4% Ni. It has a stable coefficient of linear expansion between -80°C and 230°C. It has high plasticity, toughness, impact toughness, reduction of area and elongation. It also has corrosion resistance. It is an indispensable structural material for precision instruments and equipment, and is widely used in the preparation of instruments in the fields of aerospace, atomic energy, electronics, modern weaponry and medical equipment. Aluminum alloy has the advantages of low density, good thermal and electrical conductivity, and low cost, and has become the most widely used light alloy at present. If the bimetal composite structure of Invar alloy and aluminum alloy is formed by welding, it is of great significance...

Claims

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Application Information

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IPC IPC(8): B23K15/00B23K103/20
CPCB23K15/0006B23K15/0033B23K15/0093B23K2103/20
Inventor 李晓鹏陈海瑞蒋晗彭勇杨东青范霁康王克鸿周琦
Owner NANJING UNIV OF SCI & TECH
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