These articles contain information about some of the less commonly used welding processes, such as flash welding, electron beam welding, electro-slag welding, friction welding, carbon arc welding, SAW welding, plasma arc welding, laser beam welding, thermit welding, etc.
a. General. (1) Electron beam welding (EBW) is a welding process that produces coalescence of metals with heat from a concentrated beam of high-velocity electrons striking the surfaces to be joined. Heat is generated in the workpiece as it is bombarded by a dense stream of high-velocity electrons. Virtually all of the kinetic energy, or … Read more
Resistance Welding Aluminum. The resistance welding processes (spot, seam, and flash welding) are important in fabricating aluminum alloys. These processes are especially useful in joining the high-strength heat-treatable alloys, which are difficult to join by fusion welding but can be joined by the resistance welding process with practically no loss in strength. The natural oxide … Read more
Electron beam welding is a fusion joining process in which the workpiece is bombarded with a dense stream of high-velocity electrons, and virtually all of the kinetic energy of the electrons is transformed into heat upon impact. Electron beam welding usually takes place in an evacuated chamber. The chamber size is the limiting factor on … Read more
Atomic Hydrogen Welding Aluminum. This welding process consists of maintaining an arc between two tungsten electrodes in an atmosphere of hydrogen gas. The process can be either manual or automatic with procedures and techniques closely related to those used in oxyacetylene welding. Since the hydrogen shield surrounding the base metal excludes oxygen, smaller amounts of flux … Read more
Electroslag welding is used for joining pure aluminum but is not successful for welding aluminum alloys. Submerged arc welding has been used in some countries where inert gas is not available. p. Other processes. Most of the solid-state welding processes, including friction welding, ultrasonic welding, and cold welding are used for aluminum. Aluminum can also … Read more
Friction welding is a solid-state welding process that produces coalescence of materials by the heat obtained from mechanically-induced sliding motion between rubbing surfaces. The work parts are held together under pressure. This process usually involves the rotating of one part against another to generate frictional heat at the junction. When a suitable high temperature has been … Read more
General. In thermit welding, the thermit material is a mechanical mixture of metallic aluminum and processed iron oxide. Molten steel is produced by the thermit reaction in a magnesite-lined crucible. At the bottom of the crucible, a magnesite stone is burned, into which a magnesite stone thimble is fitted. This thimble provides a passage through … Read more
Submerged arc welding is a process in which the joining of metals is produced by heating with an arc or arcs between a bare metal electrode or electrodes and the work. The arc is shielded by a blanket of granular fusible material on the work. Pressure is not used. Filler metal is obtained from the electrode … Read more
Resistance welding is a group of welding processes in which coalescence is produced by the heat obtained from resistance of the work to electric current in a circuit of which the work is a part and by the application of pressure. There are at least seven important resistance-welding processes. These are flash welding, high-frequency resistance welding, … Read more
***Forge welding Tools **are used in the *form of hot pressure welding which joins metals by heating them in an air forge or other furnace, and then applying pressure. The forge, which may be either portable or stationary, is the most important component of forge welding equipment. The two types of forges used in hand forge welding are described … Read more