Welding or both as a filler metal used as a conductive wire welding. In gas welding and gas tungsten arc welding, the metal wire used as fill; in submerged arc welding, electroslag welding, and other melting polar gas shielded arc welding, the Flux Core Welding Wire is filled with metal, but also the conductive electrode. Wire can be divided into three categories. Wire coated with oxidation of the role of surface flux.
1, rolling wire: Wire is most of these, including carbon steel wire, low-alloy steel wire, alloy steel wire, stainless steel wire and wire and other nonferrous metals.
2, cast wire: Some alloys, such as cobalt-chromium-tungsten alloy, not forging, rolling and drawing, and is made by casting method. It is mainly used for manual welding surface to meet, such as antioxidant, anti-wear and high temperature corrosion resistance and other special performance requirements. The use of continuous casting and liquid extrusion can produce up to several meters of cobalt-chromium tungsten wire, tungsten wire used to automatically fill in gas shielded arc welding, in order to improve efficiency and surfacing welding quality, while improving working conditions. Cast iron welding wire is sometimes used.
3, flux-cored wire: rolled thin strip round or shaped steel tubing, filled with a certain composition of the powder, made by drawing a seam flux cored wire, or steel pipe filled with a powder made of seamless cored pull wire (see Figure). This wire welding with high deposition efficiency, adaptability of steel, a short trial period, so its use and use expanded. This Welding Wires Manufacturers is mainly used for carbon dioxide gas shielded arc welding, submerged arc and electroslag welding. The powder composition of flux-cored electrode drugs and skin generally similar. Containing slag, making the gas composition and stability of flux-cored arc welding without shielding gas, said the self-shielded flux cored wire, for large welded structure works.
4, carbon dioxide gas shielded arc welding (referred to as CO2 welding) of the protective gas is carbon dioxide (sometimes using CO2 + O2 gas mixture). As the carbon dioxide gas thermophysical properties of 0 special effects, the use of conventional welding power source, the wire ends to form the molten metal can not balance the axial free transition, and usually requires the use of short burst of droplet necking off, therefore, and MIG welding free transition compared to splash more. However, if the use of high-quality welding machine, select the appropriate parameters, can be very stable welding process, so that splash down to a minimum. As used in protective gas prices low, with short transition weld good, coupled with the use of wire containing deoxidizer internal defects can be obtained without the quality of welded joints Liu. So this welding method has become the most important black metal welding methods.