Novel reinforcement technique of 6XXX aluminum alloy welding joint

Abstract

The invention discloses a novel reinforcement technique of a 6XXX aluminum alloy welding joint, mainly solves the defects such as high cost, large equipment and noise, complex operation, workpiece damage, additional consumption of materials and energy, additional increment of workpiece weight and residual stress, reduction of workpiece plasticity and air hole mingling in the traditional reinforcement methods of the 6XXX aluminum alloy welding joint, and achieves the reinforcement effect to the 6XXX aluminum alloy welding joint. The technique comprises the specific operation steps of solution treatment, subzero treatment and ageing treatment. The technique has the advantages of simple technique, low cost, ideal reinforcement effect, energy conservation, environmental protection and largely improved strength and plasticity, can effectively solve the problems of air holes and mingling inside the joint, and has excellent industrial application prospect.

Description

technical field [0001] The invention relates to the technical fields of welding, heat treatment and cryogenic strengthening treatment of aluminum alloys, and in particular provides a new strengthening process for welded joints of 6XXX aluminum alloys. Background technique [0002] 6XXX aluminum alloy is widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding and chemical industries due to its excellent comprehensive properties such as excellent processing performance, high strength, good plasticity, corrosion resistance and fatigue resistance. In these industrial applications, it is often encountered that aluminum alloy parts need to be welded, and due to the particularity of the aluminum alloy itself, it requires high heat input during welding, which makes it easy to cause the weld zone to recover during the welding process. , Recrystallization and grain coarsening, etc., will cause the welded joint to soften and reduce its mechanical propertie...

AI Technical Summary

Problems solved by technology

The method of increasing the load-carrying capacity by increasing the thickness of the welded joints increases the additional consumption of raw materials and energy, increases the overall weight of the workpiece, and generates residual stress at the thickened joints, resulting in falling off and instability, resulting in Huge security risk, often only used for large components

③Post-weld heat treatment, this method can improve the strength of welded joints to a certain extent, but it is also accompanied by a sharp drop in plasticity, which is not suitable for workpieces with high plasticity requirements

In addition, this method needs to heat the welded joint during the whole process. Heating in the whole process will cause the original pore defects inside the welded joint to expand due to heat, and eventually remain inside the workpiece, causing stress concentration and stress to occur locally during the service process of the workpiece. Corrosion problems affect the performance of the workpiece, that is, this method cannot solve the problems of plasticity, porosity and inclusions

[0004] In short, the above-mentioned existing technologies can strengthen the 6XXX aluminum alloy welded joints to a certain extent, but there are some technical shortcomings and application limitations.