Aluminum alloy stud welding method to remove oxidation film with vapor state brazing flux

Abstract

The invention discloses an aluminum alloy stud welding method to remove an oxidation film with the vapor state brazing flux. The aluminum alloy stud welding method comprises the steps that the end portion of an aluminum alloy stud is machined into a face with a 150 degrees taper angle, and clearing on the end portion and the portion of an aluminum plate to be welded is conducted; a self-designed sealing air hood is installed outside a welding gun stud jacket, and a vaporizing device is joined up at the entrance position of the air course of the sealing air hood; the aluminum plate is arranged horizontally and is connected to the ground, the stud is installed, and the welding gun are compressed at the position to be welded vertically downward; the shielding gas is opened, arc striking is prepared to conduct after normal air delivering is finished, the vapor state brazing flux is jetted through a control circuit before the moment of arc striking, and welding is completed. The aluminum alloy stud welding method has the advantages that middle and large diameter aldural stud can be welded, the application range on plate thickness is wide, the operation of the welding process is easy, the intensity of the a welded joint can reaches to 90 % that of the stud, and the fusing rate of the welding joint reaches to 100 %.

Description

technical field [0001] The invention relates to a welding method for a 7A52 high-strength aluminum alloy stud of a light armored vehicle, in particular to a welding method for an aluminum alloy stud that uses vapor flux to remove oxide films. Background technique [0002] Stud welding is a technique in which a stud is welded to a workpiece by passing an electric current or forming an arc between the metal stud and the workpiece to melt the metal. As a simple, efficient, low energy consumption, low pollution advanced welding technology, stud welding has been widely used in vehicles, ships, boilers, steel structures, electronics, construction, medical equipment and other fields. The most widely used method in the welding process of studs is the arc stud welding technology, which has many realization methods, which can be divided into pull There are two basic methods of arc stud welding and capacitor energy storage arc stud welding. [0003] In recent years, 7A52 high-strengt...

AI Technical Summary

Problems solved by technology

At present, there are a large number of stud-type attachments in domestic special vehicles, but the welding quality of studs in light armored vehicles is low, there are many defects in welded joints, the performance is difficult to meet the standard, and the production efficiency is low

For the stud welding of aluminum alloy, since a dense oxide film is easily formed on the surface of the alloy, it is difficult to completely remove it only by the cleaning process before welding, and there will be an oxide film formed by secondary oxidation during the welding process.

The oxide film will enter the molten pool during the stud welding process, seriously affecting the strength of the joint

[0004] The document "Research on Welding Process of Compound Heat Source for Medium and Large Diameter Aluminum Alloy Studs and Design of Process Equipment" reports a welding method in which grooves are slotted at the end of the stud and a protective agent is embedded to protect the molten pool. The end is slotted to add flux, and the flux reaction is used to remove the oxide film during the arc combustion process, but the flux after the reaction remains in the molten pool and cannot be removed, forming weld inclusions, which reduces the strength of the joint

The stud welding process of 7A52 high-strength aluminum alloy is very prone to defects such as inclusions and low fusion rate, which have a great impact on the performance of welded joints

It is difficult to guarantee the quality of welded joints of high-strength aluminum alloy studs under the conditions of existing stud welding equipment.

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