A kind of preparation method of welding wire for aluminum and aluminum alloy robot with ZN+CU/RE composite coating

Abstract

The invention relates to the field of welding wire manufacturing, in particular to a preparation method of an aluminum and aluminum alloy welding wire electrochemically plated with a Zn+Cu / Re composite coating and applied to robot welding. A pure aluminum or aluminum alloy wire rod is used as the matrix. Pretreatment, electrochemical plating of the Zn+Cu / Re composite coating and post-treatment areconducted on the surface. The electrochemically plated Zn+Cu / Re composite coating has the functions of reducing welding smoke, improving the porosity resistance of the welding wire and improving solid lubrication and meanwhile fills up pits in the surface of the welding wire matrix, and the electric conductivity and surface quality of the welding wire are improved; the bonding force and strengthof the Zn+Cu / Re composite coating are high, the aluminum or copper peeling phenomenon is avoided, the Zn+Cu / Re composite coating is high in compactness, good in rust resistance and resistant to wear,Zn can reduce welding smoke and splashes, and Re can refine plating layer crystals and reduce the void ratio; and meanwhile, molten bath stirring is enhanced, a molten bath is purified, crystals are refined, pores on the surface and on the inner portion of a welding joint are thoroughly eradicated, and the porosity resistance of the welding wire is improved.

Description

technical field [0001] The invention relates to the field of welding wire manufacturing, in particular to a method for preparing electrodeposited Zn+Cu / Re composite coating aluminum and aluminum alloy welding wire for robots. [0002] technical background [0003] Due to the advantages of low density, small specific gravity, high electrical and thermal conductivity, good casting and machining performance, aluminum and aluminum alloys have been widely used in aviation, aerospace, vehicles, ships, electrical appliances, construction and chemical industries. With the development of industrial automation, most aluminum and aluminum alloy components need to be welded by advanced robots. Therefore, higher requirements are put forward for the surface quality and welding performance of aluminum and aluminum alloy welding wires. [0004] In the manufacturing process of existing aluminum and aluminum alloy welding wire, the surface oxide skin is usually removed by mechanical scraping,...

AI Technical Summary

Problems solved by technology

[0004] In the manufacturing process of existing aluminum and aluminum alloy welding wire, the surface oxide skin is usually removed by mechanical scraping, but the waste of material is large, especially after the treatment, the surface of the welding wire is uneven, the roughness is large, and the pits and scratches are detailed, which affects the welding process. Filamentity and arc stability, increased contact tip wear

At the same time, the aluminum oxide film that may be formed on the surface of the welding wire is dense and infusible, and a series of defects such as incomplete penetration, slag inclusion, and pores are prone to occur during welding, and the amount of welding smoke is large

In addition, aluminum and aluminum alloy welding wire welding needs to use a welding power source with a special Teflon wire feeding hose in order to reduce the wire feeding resistance of the welding wire, but the replacement frequency is high, the overall cost is high, and the production efficiency is low

Although the surface of the welding wire can be coated with copper to improve the surface quality of the welding wire, there is a phenomenon that the copper chipping is easy to fall off, and it is not suitable for robot welding, especially the accumulation of copper chipping in the non-Teflon wire feeding hose is more serious

Therefore, the application of aluminum and aluminum alloy welding wire, especially in robotic automated welding, is greatly limited

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