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Method for reducing air holes of aluminum alloy cold metal transfer (CMT) welding joint

A technology for aluminum alloys and welded joints, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problems of strong porosity tendency, large porosity hazards, dynamic load bearing capacity and fatigue resistance decline of welded joints, etc.

Inactive Publication Date: 2018-12-18
TIANJIN UNIV
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Problems solved by technology

In the process of welding aluminum alloy through cold metal transfer technology CMT (cold metal transfer), aluminum alloy welding has a strong tendency of porosity, and porosity is a kind of defect that is harmful and difficult to eliminate
Generally, the size of air hole defects ranges from a few hundred microns to several millimeters. The existence of air hole defects in the weld not only reduces the effective bearing area of ​​the workpiece, but also easily causes stress concentration, resulting in the dynamic load of the welded joint. Decreased capacity and fatigue resistance

Method used

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  • Method for reducing air holes of aluminum alloy cold metal transfer (CMT) welding joint
  • Method for reducing air holes of aluminum alloy cold metal transfer (CMT) welding joint
  • Method for reducing air holes of aluminum alloy cold metal transfer (CMT) welding joint

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Embodiment Construction

[0012] The technical solutions of the present invention will be further described below in conjunction with specific embodiments.

[0013] The experimental base material involved in the present invention is aluminum alloy 6061, the specification of the test piece is 300×150×4mm, and the welding wire is ER4043. A plate surfacing test was carried out on an aluminum alloy with a plate thickness of 4mm using the direct current cold metal transfer technology CMT (cold metal transfer). The CMT welder used for the test is the CMT Advanced 4000 welder from Fronius. Its main implementation steps are as follows:

[0014] 1. Overlay welding test. Before overlay welding, remove the oxide film on the aluminum plate with a wire brush until the metallic luster is exposed. Use alcohol to clean the oil and dirt on the surface of the welding place within about 30-40mm, and remove the oxide film. After that, welding should be applied within 2 hours to avoid the formation of new oxide film;

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Abstract

The invention discloses a method for reducing air holes of an aluminum alloy cold metal transfer (CMT) welding joint. The method comprises the following steps that ultrasonic impact treatment is carried out on the welding joint; in the ultrasonic impact process, an impact needle always follows the normal direction of a welding seam to ensure that the surface of the welding seam and a welding toe are completely impacted; and due to plastic deformation on the surface of the joint after the ultrasonic impact treatment, the air holes, within 1 mm adjacent to the surface of the welding seam, insidethe joint are squeezed, so that the size of the air holes is reduced or the air holes are eliminated, the number and size of the air holes of the aluminum CMT welding joint are effectively improved,and therefore the compactness and hardness of the joint are improved.

Description

technical field [0001] The invention belongs to the field of welding technology. More specifically, the ultrasonic impact method is used to improve the number and volume of air holes in aluminum alloy CMT welding joints, thereby improving the compactness of the joints. Background technique [0002] Aluminum alloy has many excellent characteristics, such as light weight, low density, good elastic plasticity, high specific strength, wear resistance, corrosion resistance, good electrical and thermal conductivity, and excellent processing performance, etc., and is widely used in aerospace, transportation, etc. and defense construction and other manufacturing industries. In the process of welding aluminum alloy through cold metal transfer technology CMT (cold metal transfer), aluminum alloy welding has a strong tendency of porosity, and porosity is a kind of defect that is harmful and difficult to eliminate. Generally, the size of air hole defects ranges from a few hundred micro...

Claims

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Application Information

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IPC IPC(8): B23K20/10
CPCB23K20/10
Inventor 胡绳荪田银宝申俊琦李俊杰王万东
Owner TIANJIN UNIV
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