a welding method

Abstract

The invention provides a welding method. In the whole process that a workpiece is welded by a welding gun, an ultrasonic wave impact device aims at high-temperature weld metal which is solidified on the workpiece and does not recover strength to carry out ultrasonic wave impact; in such a way, the ultrasonic wave impact device and a welding gun body synchronously move in a companying way; during welding, the impact in ultrasonic frequency is applied to the high-temperature weld metal which is solidified on a certain position behind a molten bath and does not recover strength along the thickness direction of a workpiece to be welded; the metal in a condensation shrinkage state is impacted to produce ductile extension under the exciting force effect of ultrasonic wave; compressed plastic strain produced in the heating process is compensated, so as to reduce the welding deformation; the texture of the weld metal is refined, the directivity of crystalline grain crystallization is changed, and the texture tends to be more uniform. Compared with the prior art, the stress and deformation of the weld metal are effectively eliminated, the workpiece does not easily deform, the welding strength is high, the method is concise, clear and reliable, and the practicability is high.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a welding method for effectively eliminating welding residual stress and deformation. Background technique [0002] Aluminum and its alloys are one of the most widely used non-ferrous metals. Aluminum alloy materials have the advantages of high specific strength, corrosion resistance, good electrical and thermal conductivity, and weldability. The thin-plate aluminum alloy structure has the characteristics of light weight, good process performance (easy to process and form), and convenient connection, so it replaces the traditional steel structure and is widely used in various welded structure products. my country has also made great progress in the production and use of aluminum alloy profiles, and its market competitiveness has been continuously improved. In recent years, it has been widely used in the fields of aerospace, aviation, chemical industry, electrical appliances and ...

AI Technical Summary

Problems solved by technology

However, this invention simply uses the principle of ultrasonic impact to perform ultrasonic impact on the welded joint that has been welded, and cannot consistently eliminate the stress and deformation of the metal at the weld. The effect is not significant, and the workpiece still has problems such as deformation and weak strength.

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