The smaller the wire the impurity content of phosphorus and sulfur, the better the wire, and thus the weld joints and connections are more reliable. By appointment distinguish the following types of welding wire: surfacing flux cored, stainless steel welding wire and welding wire with copperplated surface. Each type of wire carried out in accordance with the standard and has its own label, which marked its conditional parameters such as diameter, the quality of metal, carbon and alloy materials and other parameters. Let's start with surfacing flux cored wire, made in accordance with GOST 26101-84. The use of this type of wire – welding under flux of various parts of carbon steel, which operate at high pressure, high temperatures. Also, this type of wire needed for welding and structural elements made of carbon steel exposed to abrasion and shock. This wire is used in welding parts various equipment, punching tools, construction machinery and cast steels. The wire diameter of 3 to 6 mm, using this welding wire, it turns deposited metal layer, which protects the steel from the permanent mechanical and thermal effects.
There are several brands of this type of wire, are the main ones: PP-NP-18H1PM, PP-NP-25H5FMS, PP-H-35V9HZSF, PP-NP-ZOH4V2M2FS, PP-NP-100H4G2AR, etc. The next type of wire – steel welding wire GOST 2246-70. There are brands like neomednennoy with a surface for welding steel, low carbon and wire copperplated surface for welding of low alloy and carbon steel. Copper coated wire surface is designed to maximize the quality of welds and joints, which can withstand very high temperature and shock, have a tensile strength and used a wire for structural and building steel, welding of large diameter pipes, as well as for the vessels and vessels under high specific pressure. Diameter wire neomednennoy surface of 0,8-6 mm, with a surface copperplated 0.8-1.6 mm. Copper coated welding wire has several advantages, for example, contributes to the stability of the arc, and welding with wire copperplated level splashing of electrode metal is minimal. Whatever kind of wire is not used, the basic requirements to the wire remains the same: the chemical composition of welding wire must match the composition of metal of which made the work piece or the elements, the wire should melt at a temperature almost equal to the temperature of the metal, the melting should be uniform, and she wire should not be dirty or oxidized.