Dual-coating environment-friendly non-copper-coating robot solid welding rod with epoxy group electric conduction coating as middle layer and preparation method of same

Abstract

The invention belongs to the field of welding rods and discloses a dual-coating environment-friendly non-copper-coating robot solid welding rod with an epoxy group electric conduction coating as a middle layer and a preparation method of the same. Dual coatings include the epoxy group electric conduction coating and a nano composite coating, wherein the epoxy group electric conduction coating is located between the nano composite coating and a matrix of the solid welding rod, and the mass ratio of the epoxy group electric conduction coating to the nano composite coating is (1.0-2.0): (2.3-4.2). By means of the dual-coating environment-friendly non-copper-coating robot solid welding rod with the epoxy group electric conduction coating as the middle layer and the preparation method of the same, the problems of poor adhesion force between the nano composite coating and the matrix of the welding rod and poor electric conductivity are solved.

Description

technical field [0001] The invention relates to a solid welding wire for a double-coated environment-friendly non-copper-plating robot with an epoxy-based conductive coating as an intermediate layer and a preparation method thereof, belonging to the field of welding wires. Background technique [0002] In 2015, the total output of welding materials in my country was about 4.15 million tons, of which solid welding wire accounted for more than 38%, and it has formed two main bodies alongside welding rods. With the continuous improvement of the level of welding automation in my country, the proportion of welding robots used in the production of welding structures is getting higher and higher, the proportion of welding rods will decrease, and the proportion of solid welding wire will increase. It is estimated that by 2025, solid welding wire will become my country's The first major body of welding material. At present, the gas-shielded solid welding wire uses copper plating as t...

AI Technical Summary

Problems solved by technology

At present, the gas-shielded solid welding wire uses copper plating as the final surface treatment, so that it has good electrical conductivity, anti-rust and anti-wear and anti-friction properties, and the wear of the contact tip is small, but it also has the following problems: ① During the manufacturing process Processes such as pickling and copper plating will produce a large amount of waste gas, waste liquid and solid waste, which will seriously pollute the surrounding environment; ② welding fume contains a large amount of "copper fume", which will damage the physical and mental health of welders; ③ the surface copper layer is easy to peel off and block The wire feeding hose seriously affects the wire feeding performance of robot welding, and arc breaks and non-feeding often occur during welding; ④It is not suitable for continuous robot automatic welding, so it is urgently needed to use an environmentally friendly nanocomposite coated welding wire To replace the current copper-plated welding wire, this is the inevitable trend of the development of gas-shielded solid welding wire

At present, there are some key problems in the nanocomposite coated welding wire: ①The rust resistance and electrical conductivity of the welding wire are poor; ②The contact tip is seriously worn; The wire feeding resistance increases and the arc stability deteriorates, which seriously affects the precision of robot welding, making it difficult to obtain satisfactory weld quality. Therefore, preparing a conductive lubricating anti-rust coating on the surface of copper-free welding wire is a solution to these problems. the crux of the matter

[0003] At present, the surface coating preparation process of copper-free welding wire includes mechanical coating method, sol-gel method, vapor phase deposition, nanocomposite plating, powder electrostatic spraying method, chemical coating, brush plating, and some special surface treatment methods, etc., but These preparation methods have the disadvantages of complex coating process, high cost, and inability to quickly prepare coatings online, and some methods have certain pollution to the environment. The single performance of the prepared coating is better, but its comprehensive performance is poor.

For example, some coatings have excellent lubricity, but poor conductivity and rust resistance; or coatings have good rust resistance, but poor lubricity and conductivity, so a coating with excellent comprehensive performance layer is the prerequisite for industrial application of copper-free welding wire

Images