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Method for improving softening of high strength aluminum alloy welded joint

A welding joint, aluminum alloy technology, applied in welding equipment, arc welding equipment, metal processing equipment, etc., can solve the problems of poor working environment, unsuitable use of small components, and high cost

Active Publication Date: 2014-12-24
TIANJIN UNIV
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Problems solved by technology

These methods can restore the weakened or disappeared heat treatment strengthening effect in the welding process to a certain extent, but they all have various shortcomings. For example, the aging strengthening adopted can improve the joint strength within a certain range, but this method is also It is prone to "over-aging" softening; although welding hammering can improve the mechanical properties of thin plate structure welds and weld toes, it requires additional devices and the control is more complicated; the temperature difference stretching method has low production efficiency, high cost, and poor working environment. It is not suitable for the welding of closed welds; local reinforcement can make the total bearing capacity of components meet the design requirements, suitable for medium and large components, and small components are not suitable for use

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  • Method for improving softening of high strength aluminum alloy welded joint
  • Method for improving softening of high strength aluminum alloy welded joint
  • Method for improving softening of high strength aluminum alloy welded joint

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Embodiment Construction

[0022] The technical solutions of the present invention will be described in detail below in conjunction with specific embodiments.

[0023] The welded joint is formed by butt welding two 2219 aluminum alloy plates with a size of 300mm×150mm×8mm along the long side, and the groove is a 70°V-shaped groove. Welding machine adopts Dynasty700 variable polarity TIG welding machine produced by Miller Company of the United States. Before welding, wipe the surface of the test piece with alcohol to remove oil stains, then use a hand-held electric wire brush to remove the surface oxide film, and finally wipe with alcohol to remove aluminum chips. In order to prevent the aluminum oxide film from forming again on the surface of the aluminum alloy, welding should be carried out within 4 to 8 hours after treatment. During the welding process, rigid fixtures are used to fasten the welded aluminum plate on the welding table to control welding deformation, and the clamping force should be appr...

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Abstract

The invention discloses a method for improving softening of high strength aluminum alloy welded joint. The method is as below: first heating a heating furnace to a solid solution temperature at a uniform speed; placing the welded workpiece into a furnace for heat preservation when the temperature is stable; after the heat preservation, taking out the workpiece; placing the workpiece into the cold water for quenching treatment; then placing the quenched workpiece into the heating furnace, and heating to aging temperature at a uniform speed for insulation; and after insulation, cooling the workpiece with the furnace to room temperature. Through solid solution treatment and artificial aging on the welded high strength aluminum alloy, the invention improves the problem of joint softening; and by means of hardness test and tensile test of the workpiece, the method can recover the strength of welded joint to more than 80% of the parent material.

Description

technical field [0001] The invention relates to the field of welding technology, more specifically, to a method for improving the softening of high-strength aluminum alloy welded joints in the field of welding. Background technique [0002] Aluminum alloy has the characteristics of low density, high specific strength, non-magnetism, good corrosion resistance, low temperature toughness and formability, and is widely used in various welding structures, becoming an ideal lightweight material. After welding aluminum and aluminum alloys, there are different degrees of joint softening problems, especially for high-strength aluminum alloys that can be strengthened by heat treatment, the problem of weld joint softening is particularly serious, the reason is mainly due to the microstructure and properties of the weld seam and heat-affected zone. It is caused by changes under the influence of welding high temperature environment. The softening of the heat-affected zone is mainly due ...

Claims

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Application Information

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IPC IPC(8): C22F1/04C21D9/50B23K9/167B23K9/235
Inventor 王颖王东坡丁吉坤杜辉王志江
Owner TIANJIN UNIV
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