Hebei XINYU Welding Co., Ltd, mainly produces high-strength steel welding wire, Non-copper-coated solid wire, submerged arc & stainless steel welding wire. Our products are widely applied to the welding of low-alloy high tensile large & key steel structures in coal machinery, construction machinery, petrochemical machinery, pressure vessels or tanks, oil & gas pipelines, military industry, shipbuilding, bridge, and high-rise buildings, etc. At the same time, we are the only enterprise in the domestic which produces welding wire as well as welding wire equipment.
Our Welding wires and welding wire equipment are exported to the USA, Italy, Brazil, Russia, and India, etc. Welcome you to our factory any time.
Hard fatty acid lubrication process
The metal soap extreme pressure agent of stearate lubricant and rust inhibitor, as well as a certain amount of zinc, copper, aluminum, titanium and other metal powders, are mixed into lubricating particles for wire drawing. The particle size of metal powder is not more than 325#, and the mass fraction is generally about 10% (up to 30%), so that the total mass of lubricant attached to the surface of welding wire is about 0.01%~0.25 % silk, and the metal powder is 0.001%~0.10%.
Water-soluble liquid lubricant process
Water-soluble liquid lubricant is suitable for low-hydrogen welding wire. Firstly, the semi-finished wire is electrolytically pickled with 15%~25% H2SO4 solution.
Next, the cleaned wire is pulled out 1 to 2 times at a compression rate of 5% to 25%. The wire drawing lubricant consists of water-soluble sodium soap and water-soluble inorganic antirust agent. Typical formulations are: 0.75% and 0.75% mass fraction of sodium triglyceride hard fatty acid and sodium chromate respectively, the rest is water, and the volume fraction of rust inhibitor is 0.3% to 1.5%.
Surface coating process
The surface coating of the welding wire should be rust and moisture resistant, without destroying the stability of the arc and the metallurgical properties of the weld.
Ultra-fine graphite, molybdenum disulfide, fluorine resin without hydrogen as a surface treatment agent for welding wire or trichloroethylene or carbon tetrachloride as a solvent, and add a small amount of CeO2, K2CO2, CsCO3 as an arc stabilizer to improve the performance of the wire can be as needed. Some companies use Nashk rust inhibitor coating to make copper-free welding wire. The rust prevention mechanism is that a single molecular deposit layer adsorbs to the metal surface, blocking the action of microcells in the atmospheric environment on the metal surface and inhibiting the occurrence of electrolytic corrosion.
Less welding dust
When welding, copper-plated wire produces a little yellow smoke, and no copper-plated wire emits blue-white smoke, i.e., the smoke does not contain Cu elements, reducing the harm to the welder. During the welding process of solid core welding wire, the soot is mainly produced by the oxidation of metal vapor, and copper is the main harmful element produced during the welding process of copper coated solid core welding wire. non copper coated welding wire has a much lower Cu content than traditional copper-free wire, so non copper coated welding wire is better for protecting the welder's health. Statistics show that the smoke level of Non Copper Coated Welding Wire is about 20% lower than that of copper-coated wire.
Copper-free wire produces less spatter during the welding process, which ensures consistently high quality welded joints and reduces the amount of post-weld cleanup that relies primarily on matching welding parameters.
Good arc and feed properties
Non-copper wire has good arc performance. The average short-circuit transition time of the molten droplet is shorter than that of copper-plated wire and can withstand sharp changes in wire extension length during the welding process. The special surface treatment process keeps the copper plating layer from peeling off and maintains stable wire feeding for a long time even at high speed, obtaining higher welding and deposition efficiency.
Better strength and forming quality
Traditionally, it is believed that copper layer is more rust-proof because iron is more active than copper. However, corrosion results from salt spray tests (temperature 30°C, air humidity 80%, 2h in 0.01% NaCl solution) showed that copper plated wire corroded more severely than Non Copper Coated Welding Wire.
It was concluded that the severe corrosion of copper coated welding wire is due to the rapid corrosion of primary cells, which tend to form where the tiny copper layer is cracked or the copper layer is peeling off. non Copper Coated Welding Wire surface does not touch other metals and does not form primary cells. The addition of rust-proof grease makes its rust-proof ability better than that of copper-plated wire.
Non Copper Coated Welding Wire shows a series of advantages such as less welding fumes, less welding spatter, good stability of welding arc and good weld seam forming during the welding process, which is an environmentally friendly and economical new product and has been widely used in mechanical processing, construction engineering, aerospace, bridge engineering, steel structure processing, etc. It can be considered as the development direction of solid wire .
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