A method to improve the softening problem of high-strength aluminum alloy welded joints
A technology for welding joints and aluminum alloys, applied in welding equipment, arc welding equipment, metal processing equipment, etc., can solve the problems of high cost, poor working environment, unsuitable use of small components, etc., and achieve the effect of improving the softening problem
Active Publication Date: 2016-05-25
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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[0022] The technical solutions of the present invention will be described in detail below with reference to specific embodiments.
[0023] The welded joint is made of two 2219 aluminum alloy sheets with a size of 300mm×150mm×8mm butt-welded along the long side, and the groove is a 70°V-shaped groove. The welding machine adopts the 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 polish to remove the surface oxide film, and finally wipe with alcohol to remove aluminum chips. In order to prevent the aluminum oxide film from being formed again on the surface of the aluminum alloy, the welding should be carried out within 4 to 8 hours after the treatment. During the welding process, rigid fixtures are used to fasten the welded aluminum plate on the welding table to control the welding deformation, and pay...
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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, and more particularly, to a method for improving the softening of welded joints of high-strength aluminum alloys in the field of welding. Background technique [0002] Aluminum alloy has the characteristics of low density, high specific strength, non-magnetic, good corrosion resistance, low temperature toughness and formability, and is widely used in various welding structures, becoming an ideal lightweight material. After aluminum and aluminum alloys are welded, there are different degrees of joint softening problem, especially for high-strength aluminum alloys that can be strengthened by heat treatment, the welding joint softening problem is particularly serious, mainly due to the structure and properties of the weld and heat affected zone. It is caused by changes under the influence of high temperature welding environment. The softening of the heat-affected zone is mainly caused by "over-agi...
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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