(1) manual arc welding manual arc welding is a welding method for the development of the earliest and still most widely used in various arc welding methods. It is based on the external electrode coated with a coating for the electrodes and filler metals, the arc is burning between the electrode end and to be welders surface. Arc Thermal effect on the one hand, the coating can produce gas in order to protect the arc, on the other hand can produce slag covering the bath surface to prevent the interaction of the molten metal with the surrounding gas. More important role of the slag and molten metal to produce physical and chemical reaction or alloying elements to improve the performance of the weld metal. Manual arc welding equipment is simple, lightweight, flexible operation. Can be applied to the short seam welding in the repair and assembly, especially for hard to reach parts of the welding. Manual arc welding with the corresponding electrode to be applied to most industrial carbon steel, stainless steel, cast iron, copper, aluminum, nickel and its alloys. (2) submerged arc welding submerged arc welding is a continuous feed of wire as an electrode and filler metal. Welding in the Welding Electrodesabove covered with a layer of granular flux, arc burning, the flux layer and the wire end and the local base metal melting, the formation of the weld. Under the action of the arc heat, on the part of the flux melting slag and metallurgical reaction in the liquid metal. Slag floating on the surface of the molten pool, on the one hand, to protect the weld metal, to prevent air pollution, physical and chemical reaction with molten metal, extreme and performance improvement of weld metal; the other hand, can also make the weld metal Ling was slow. Submerged arc welding current. Compared with manual arc welding, its biggest advantage is that the weld quality, high welding speed. Therefore, it is particularly suitable for the circumferential seam straight seam welding large workpieces. And most of the use of mechanized welding. The submerged arc welding has been widely used for welding of carbon steel, low alloy structural steel and stainless steel. Slag can reduce the joint cooling rate, some high-strength structural steel, high carbon steel can be used submerged arc welding. (3) tungsten inert gas shielded arc welding is a non-MIG arc welding is the use of electric arc between tungsten electrode and the workpiece metal melting and the formation of the weld. Tungsten welding process to melt, and only play the role of the electrode. Sent by the welding torch nozzle argon or helium as a protection. Also required the addition of the metal. In the international arena known as TIG welding. Tungsten inert gas shielded arc welding can control the heat input, so it is an excellent way to connect the sheet metal and welding primer. This method can be used for almost all connection to the metal, especially suitable for Welding Materialand magnesium can form refractory oxides, metal such as titanium and zirconium these lively metal. This method of welding the weld quality is high, but compared with other arc welding, the welding speed is slow. (4), plasma arc welding and plasma arc welding is a non-Electrode Arc. It is used between the electrode and the workpiece compression arc (call forwarding transfer arc) welding. The electrode is usually tungsten. Production of the mixture of the plasma arc plasma gas can be used argon, nitrogen, helium or two of them. Also through a nozzle with an inert gas protection. Plus filler metal when welding without filler metal. Plasma arc welding, arc straight, energy density, and thus arc penetration ability. The effect of plasma arc welding holes, for a certain thickness within the scope of most metals can not open groove butt, and to ensure penetration and weld uniform. Therefore, plasma arc welding of high productivity, weld quality. However, plasma arc welding equipment (including nozzle) is more complex, demanding control of welding parameters. The vast majority of the metal tungsten inert gas shielded arc welding, can be used to plasma arc welding. In contrast, less than 1mm thin metal welding, the use of plasma arc welding can be easier to carry. (5) melting of polar gas shielded arc welding of this welding method is the use of electric arc burning between the continuous feeding wire and workpiece as heat source, gas shielded arc welding torch nozzle to be welded. MIG arc welding is usually used to protect gas: argon, helium, carbon dioxide gas or a mixture of these gases. Known as the melting of inert gas shielded arc welding (in the international community referred to as MIG welding); argon or helium shielding gas to the inert gas and oxidizing gases (O2, CO 2) gas mixture for the protection of gas, or CO2 gas or CO2 + O2 mixture for the protection of gas, or CO2 gas or CO2 + O2 gas mixture for the protection of gas, collectively referred to as metal active gas shielded arc welding (in the international community referred to as MAG welding). The main advantage of the MIG arc welding can be convenient for all position welding also has a faster welding speed, high Deposited advantages. Metal active gas shielded arc welding is applicable to most of the major metals, including carbon steel, alloy steel. Metal inert gas shielded arc welding in stainless steel, aluminum, magnesium, copper, titanium, zirconium and nickel alloys. Arc welding can also take advantage of this welding method.
This is the resistance of the heat energy welding methods, including electroslag welding and slag resistance of heat energy to the solid resistance of the thermal energy resistance welding. Resistance spot welding, coating and welding, seam welding, high frequency welding, flash Welding Electrode, resistance welding, including: Electroslag welding with unique characteristics, so on to be described later. Introduces several solid resistance heat energy resistance welding, spot welding, seam welding, projection welding and butt welding. Resistance welding in general is to make the workpiece in a certain electrode under pressure and use of resistance heat generated by the current through the workpiece, the contact between the two workpiece surface melting and the connection of the welding method. Typically use a larger current. In order to prevent the arc and to forging the weld metal, the welding process is always to put pressure on the contact surface. This type of resistance welding, welders surface good and stable welding quality is of paramount importance. Therefore, the welding must be contact between the electrode and the workpiece and the workpiece and the workpiece surface to clean. Wu of spot welding,
and projection welding is the welding current (single phase) large (thousands to tens of amperes), power-on time is short (a few weeks wave to a few seconds), expensive equipment, complex, high productivity, and therefore suitable for large mass production. Mainly used for welding thickness less than 3mm sheet metal components. Various types of steel, aluminum, magnesium and other nonferrous metals and alloys, stainless steel can be welded