The basic process of manual arc welding

1.Classification

Arc welding can be divided into manual arc welding, semi-automatic (arc) welding, automatic (arc) welding. Automatic (arc) welding usually refers to submerged arc automatic welding – the welding site is covered with a protective layer of flux, the photonic wire made of filler metal is inserted into the flux layer, and the welding metal generates an arc, the arc is buried under the flux layer, and the heat generated by the arc melts the weld wire, flux and base metal to form a weld, and the welding process is automated. The most commonly used is manual arc welding.

3.Main parameters   

The most important parameters in the welding specifications of arc welding are: welding rod type (depending on the material of the base material), electrode diameter (depending on weldment thickness, weld position, number of welding layers, welding speed, welding current, etc.), welding current, welding layer, etc. In addition to the above-mentioned ordinary arc welding, in order to further improve the quality of welding, it is also used: gas shielded arc welding: for example, argon arc welding using argon as a shielding gas in the welding area, carbon dioxide shielded welding using carbon dioxide as the shielding gas in the welding area, etc., the basic principle is to weld with the arc as the heat source, and at the same time continuously spray protective gas from the nozzle of the spray gun to isolate the air from the molten metal in the welding area to protect the arc and the liquid metal in the welding pool from oxygen, nitrogen, Hydrogen and other pollution to achieve the purpose of improving the quality of welding. Tungsten argon arc welding: a metal tungsten rod with a high melting point is used as an electrode that generates an arc when welding, and arc welding under the protection of argon, which is often used in stainless steel, high-temperature alloy and other welding with strict requirements. Plasma arc welding: This is a welding method developed by tungsten argon arc welding, in the nozzle aperture of the machine Arc welding current size judgment: small current: narrow welding bead, shallow penetration, easy to form too high, not fused, not welded through, slag, porosity, weld rod adhesion, arc breaking, no lead arc, etc. The current is large: the weld bead is wide, the depth of penetration is large, the bite edge, the burn-through, the shrink hole, the splash is large, the overburn, the deformation is large, the weld tumor and so on.