Weak current College】 【common welding technology comparison --- Power By】 【China power house network.

<br> commonly used welding process has: <BR>, Üí arc welding (TIG, arc welding, submerged arc welding, gas tungsten arc welding, plasma arc welding, gas welding) <BR> <BR>, Üí .. welding <BR> <BR>, Üí beam welding (electron beam welding, laser welding) <BR> <BR>, Üí brazing <BR> <BR>, Üí heat energy to resistance: electroslag welding ., high frequency welding;. <BR> <BR>, Üí chemical energy for welding: welding, pressure welding, explosion welding; <BR> <BR>, Üí energy to mechanical energy for welding: friction welding, cold .welding, ultrasonic welding, diffusion bonding <BR>. <BR> <BR> <BR> 1.. <BR> <BR> Arc welding arc welding is the most widely used welding method.. It includes .: manual arc welding, submerged arc welding, gas tungsten arc welding, plasma arc welding, MIG welding and so on.. Most of the arc is burning between the electrode and the workpiece the arc as heat source.. In the formation of joint, .you can use or may not use filler metal.. Electrode is used in the process of melting in the welding wire, the known melting arc welding, such as hand arc welding, submerged arc welding, gas shielded arc welding, tubular wire arc welding, .etc.; electrode is used in the welding process does not melt. The tungsten carbide, or when called arc welding without melting, such as TIG welding, plasma arc welding and so on.. <BR> <BR> (1) .<BR> <BR> arc welding arc welding arc welding of various methods of development of the earliest and is still the most widely used as a welding method.. It is based on the external electrodes coated with paint for electrodes and filler metals ., welding arc is the end and was burning between the surface of the welder.. Coatings under the action of the arc heat can produce gas in order to protect the one hand, arc, on the other hand can produce slag covering the weld pool surface ., the molten metal to prevent the interaction with the surrounding gas.. More important role in slag and molten metal is produced physical and chemical reactions or alloying elements to improve the weld metal properties.. Manual arc welding equipment is simple, lightweight, flexible operation ... Can be applied to maintenance and assembly of the welding seam in short, in particular, the site can be used for welding difficult to achieve.. Manual arc welding electrode equipped with the appropriate applicable to most industrial carbon steel, stainless steel, cast .iron, copper, aluminum, nickel and their alloys.. <BR> <BR> (2) SAW SAW <BR> <BR> when the wire is sent as a continuous electrode and filler metal.. Welding, welding .area covered in a layer of granular flux, arc burning under the flux layer, the tip of the wire and the local base metal melting to form a weld.. Under the action of heat in the arc, molten slag on the part of the flux .and metallurgical reaction with the liquid metal occurs.. Slag floating on the surface of the metal bath, on the one hand to protect the weld metal, to prevent air pollution, and with the physical and chemical reaction produces molten metal to improve the performance of .the weld metal and extreme; the other hand, the weld metal can. slow of cooling.. Submerged arc welding can use a larger current.. Compared with manual arc welding, its biggest advantage is that the weld quality, high welding speed.. .Therefore, it is particularly suitable for welding of large parts of the girth seam straight.. And most of the mechanized welding.. SAW has been widely used in carbon steel, low alloy steel and stainless steel welding.. As the cooling rate of slag .can reduce the joint, so some of the high-strength structural steel, high carbon steel submerged arc welding, also can be used.. <BR> <BR> (3) gas tungsten arc welding <BR> <BR> .; This is a non-MIG arc welding is the use of tungsten arc between the workpiece and the weld metal formed by melting. The.. TIG welding process does not melt, only play the role of the electrode.. At the same time sent .by the welding torch nozzle for the protection of argon or helium.. Also necessary to add other metals.. Internationally known as TIG welding.. Gas tungsten arc welding as well to control the heat input, so it is connected and backing weld sheet metal .as a great way.. This method can be used for virtually all metal connections, especially for welding aluminum and magnesium which can form refractory oxides such as titanium and zirconium metal and the active metals.. The welding seam of high quality, but compared with .other arc welding, the welding speed is slower.. <BR> <BR> (4) <BR> <BR> plasma arc is a plasma arc welding arc welding without melting.. It is the use of compressed between .the electrode and the workpiece the arc (called the forward transfer of the arc) to achieve welding.. Is usually used in tungsten electrodes.. Plasma arc generated plasma gas can be argon, nitrogen, helium, or in which both the mixture.. .Also protected with an inert gas through the nozzle.. Welding filler metal can be applied, it may not add filler metal.. Plasma arc welding, arc because of its straight, energy density, and thus the arc penetrating ability.. Plasma arc welding .holes generated effects, for a certain thickness range of most metals can not open butt, and to ensure uniform penetration and weld.. Therefore, the production rate of plasma arc welding, weld quality.. However, plasma arc welding equipment (including nozzle) .more complicated, the control of welding parameters demanding.. Gas tungsten arc welding of most metals can be, can by plasma arc welding.. In contrast, for 1mm below the welding of thin metal with a plasma arc welding can be easily carried out. .. <BR> <BR> (5) MIG welding arc <BR> <BR> this method is the use of continuous feeding of the wire and the workpiece as heat between the combustion of the arc, the welding torch gas .nozzle. protection for arc welding.. MIG arc welding is usually used to protect the gases: argon, helium, CO2 gas or mixture of these gases.. Argon or helium gas for the protection referred to as metal inert gas shielded arc welding (MIG .for short in the international welding); to inert gases and oxidizing gases (O2, CO2) to protect the gas mixture, or. CO2 or CO2 + O2 gas mixture for the protection of gas, or CO2, or CO2 + O2 gas mixture for .the protection of gas, referred to as melting active gas arc welding (referred to as MAG in the international welding.). MIG arc welding of the main advantages of various locations can be easily welded, but also with the welding speed, deposition rate and .so on.. Melting active gas arc welding applied to most of the major metals, including carbon steel, alloy steel.. Metal inert gas welding for stainless steel, aluminum, magnesium, copper, titanium, zirconium and nickel alloys.. This can also .be used for arc welding spot.. <BR> <BR> (6) tubular wire arc welding <BR> <BR> tubular wire arc welding is also sent to the wire using the continuous burning of the arc between the .workpiece to be welded to the heat source, can be considered MIG. a type of welding.. Tubular wire is used in welding, pipe built with various components of the flux.. Welding, plus the protection of gas, mainly CO.. Decomposition .or melting heat flux plays a slagging protection solution pool, alloying and arc stability and so on.. In addition to tubular wire arc welding with the MIG arc welding of the advantages, the role of the flux tube, so that more advantages in metallurgy on ... Tubular wire arc welding of various ferrous metal can be applied to most of the welding joints.. Tubular wire arc welding in some advanced industrial countries have been widely used.. <BR> <BR> 2. <BR> .<BR> This is a resistance welding heat to the energy of a class of welding, including the slag resistance of heat as energy to the solid resistance of electroslag welding and heat resistance of energy. welding.. The electroslag welding more unique features, .it is described later on.. This introduces some solid resistance welding heat to energy, mainly spot welding, seam welding, projection welding, and welding and so on.. Resistance welding is generally at a certain electrode to the workpiece under pressure and use of .current through the workpiece resistance heat generated by contact between the two workpiece surface melting and welding methods to achieve the connection.. Typically use a larger current.. In order to prevent the occurrence of the contact surface and in order to forging weld metal arc welding .process has always been to apply pressure.. For this type of resistance welding, the welder parts of the surface was good for a stable welding quality is of paramount importance.. Therefore, the welding electrode and the workpiece before and the contact between the workpiece .and the workpiece surface to clean.. Spot welding, seam welding and projection welding of the Wu is the welding current (one phase) large (thousands to tens of amperes), power a short time (few weeks to a few seconds waves), .equipment is expensive, complex, high productivity, therefore suitable for large. mass production.. Mainly used for welding thin plate thickness of less than 3mm components.. Various types of steel, aluminum, magnesium and other nonferrous metals and alloys, stainless steel can .be welded.. <BR> <BR> 3.. <BR> <BR> Beam welding welding method of this class include: electron beam welding and laser welding.. <BR>..