A laser wire-filling welding method for aluminum/steel dissimilar metals in medium and thick plates

Abstract

The invention provides a method for laser wire-filling welding of medium-thick aluminum / steel dissimilar metals, which comprises the following steps: (1) making Y-shaped grooves and V-shaped grooves respectively on aluminum plates and steel plates of equal thickness to be welded, and Deep cleaning of the Y-shaped groove, V-shaped groove, and the upper and lower surfaces of the aluminum plate and steel plate; (2) Place the aluminum plate and steel plate to be welded on the welding fixture for clamping and fixing, and the welding joint form is a butt joint; (3) Adjust The position of the main beam and the auxiliary beam, setting the beam power; (4) setting the process parameters, and once the welding process parameters are determined, they will remain unchanged during the welding process. The welding method uses laser wire filling to increase the absorption rate of the aluminum alloy, stabilize the welding process, prevent the conditions for crack formation, and improve the mechanical properties of the weld, and the welding method can effectively adjust the temperature field distribution of the welded joint, which is beneficial to control Interfacial reaction, while solving the defect of unfused sidewall, improving the strength of welded joints.

Description

technical field [0001] The invention relates to a laser wire-filling welding method for aluminum / steel dissimilar metals of medium and thick plates, and belongs to the technical field of laser processing of dissimilar metals. Background technique [0002] In recent years, in domestic and foreign industrial production, more and more products adopt aluminum / steel bimetallic welding structure, especially in aviation, automobile, electrical engineering, chemical industry, national defense and other industrial sectors. However, the medium and thick plate has high strength and can withstand high load weight, impact and pressure. It is mainly used in the outer shell and internal bulkhead of the hull, the manufacture of large-diameter oil and gas pipelines, and gates of hydropower stations. middle. In addition, aluminum and aluminum alloys have low density, high specific strength, and good electrical conductivity, thermal conductivity, and corrosion resistance. In order to give ful...

AI Technical Summary

Problems solved by technology

In addition, due to the high reflectivity of the aluminum alloy to the laser, the joint softens, and the welding process is prone to thermal cracks, etc., these problems limit the use of laser welding to join aluminum / steel dissimilar metals

[0009] Therefore, the welding methods in the prior art are difficult to meet the welding requirements of aluminum / steel dissimilar metals in medium and heavy plates

Images