Environment-friendly copper-plating-free solid welding wire surface nano composite coating

Abstract

The invention provides an environment-friendly copper-plating-free solid welding wire surface nano composite coating and belongs to the field of welding wires. The coating is prepared from nano solid powder, anti-rust oil and arc stabilizing agent at a mass ratio of (0.5-1.5): (0.2-1.0): (1.2-2.0); the nano solid powder consists of nano graphite fluoride powder, nano molybdenum powder, nano molybdenum disulfide, nano tungsten disulfide or nano ferroferric oxide, micron calcium fluoride or micron barium fluoride, and micron PTFE powder; the anti-rust oil is prepared from perfluoropolyether synthetic oil, rapeseed oil, sorbitan monooleate, petroleum sodium sulfonate, lanolin, nano serpentine, calcium naphthenate, polyisobutylene-bis-succinimide, zinc dialkyl dithiophosphate and molybdenum dialkyldithiocarbamate; the arc stabilizing agent is composed of one or more of alkali metal compounds. The prepared coating is good in wear resistance and rust resistance, stable in electric arc during welding and less in conductive nozzle wear and meanwhile has less pollution to the environment.

Description

technical field [0001] The invention relates to an environment-friendly method for preparing a nanocomposite coating on the surface of a copper-free solid welding wire, 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. Environmental pollution problems generally exist in the machinery manufacturing industry. With the country's emphasis on environmental p...

AI Technical Summary

Problems solved by technology

The traditional gas-shielded solid welding wire mainly uses copper plating as the final post-processing process, so that the surface of the welding wire has good conductivity and rust resistance, and the wear of the contact tip is small. Waste acid waste alkali and other substances that pollute the environment will be produced, and the welding fume contains a large amount of "copper fume", which will seriously damage the health of welders and induce many respiratory diseases

At the same time, the copper layer on the surface of the copper-plated welding wire is easy to peel off, which will block the wire feeding hose and seriously affect the wire feeding performance of the welding wire. Arc breaks and no wire feeding often occur during welding. It is not suitable for continuous robot automatic welding, so it is urgently needed Development of an environmentally friendly copper-free welding wire to replace copper-coated welding wire

At present, there are still some key problems in copper-free welding wire, such as poor rust resistance of the welding wire, and serious wear of the contact tip. Therefore, preparing an anti-rust and anti-wear coating on the surface of copper-free welding wire is a feasible way to solve these problems.

[0003] At present, there are sol-gel method, physical vapor deposition, nano-composite plating, spraying method, chemical plating, brush plating, and some special surface treatment methods in the preparation process of copper-free welding wire surface coating, but these methods have the advantages of coating preparation. The process is complicated, the cost is high, and the coating cannot be prepared online quickly, and some methods have certain pollution to the environment

Images