The types of arc welding
Hebei wire feeding wheel tell you small make up the types of arc welding
Arc welding is the most widely used welding method. It includes: hand arc welding, submerged arc welding, tungsten electrode gas shielded arc welding, plasma arc welding, melting polar gas shielded welding, etc. Most of the arc welding is between electrode and workpiece the burning arc as heat source. In the formation of joint, also can not use filler metal can be used. The electrode is used in the process of welding molten solder wire, was called fusion arc welding, such as hand arc welding, submerged arc welding, gas shielded arc welding wire, tubular electric arc welding, etc. The electrode is used in the welding process is not molten carbon rod or tungsten rods, called dont melt arc welding, such as tungsten argon arc welding and plasma arc welding, etc.
(1) hand arc welding
Hand is welding arc welding methods in the development of the application is still the most widely and earliest a welding method. It was based on the external electrode of coated with paint electrodes and filler metals, arc is in between the electrode and the end of the welding workpieces surface burn. Coating under the effect of arc heat on the one hand, can produce gas in order to protect the electric arc, on the other hand can produce slag in molten pool surface cover, to prevent the molten metal and the interaction of surrounding gas. Slag role is more
(2) the submerged arc welding
Submerged arc welding is a continuous when feeding wire as electrodes and filler metals. When welding, the welding area covered with a layer of granular flux, arc burning under the flux layer, will wire ends and local parent metal melting, formation of weld. On the arc under the action of heat, part of the flux melting slag and liquid metal metallurgical reaction. Slag on the surface of the metal molten pool, on the one hand can weld metal protection, prevent the air pollution, and physical and chemical reaction with the molten metal, improve the composition and performance of the weld metal; On the other hand can also make the weld metal ling but slowly. Submerged arc welding can be used in a large welding current. Compared with manual welding, its biggest advantage is good weld quality, high welding speed. Therefore, it is especially suitable for welding of large workpiece straight seam girth. And most used mechanized welding. Submerged arc welding has been widely used for welding of carbon steel, low alloy steel and stainless steel. Due to slag can decrease the cooling rate of joint, therefore some high strength structural steel, high carbon steel and submerged arc welding welding can be applied.
(3) the tungsten electrode gas shielded arc welding
This is a not melting polar gas shielded arc welding, is the use of the electric arc between tungsten electrode and workpiece melt metal and the formation of a weld. During the welding process of tungsten is melting, only ACTS as electrode. At the same time, by the torch nozzle in argon or helium for protection. Can also according to need to add another metal. Internationally known for TIG welding. Tungsten electrode gas shielded arc welding as well to control heat input, so it is a connecting sheet metal and backing weld of a kind of very good method. This method can be used in almost all the metal connection, especially suitable for welding of aluminum, magnesium, these can form refractory oxide of metal and active metal such as titanium and zirconium. This kind of welding method of welding quality is high, but compared with other electric arc welding, the welding speed is slow.
