Copper is a reddish metal, that is very ductile and malleable, and has high electrical and heat conductivity. It is used as a major element in hundreds of alloys. Commercially pure copper is not suitable for welding. Though it is very soft, it is very difficult to machine due to its high ductility. Beryllium copper contains … Read more
Cobalt is a hard, white metal similar to nickel in appearance, but has a slightly bluish cast. Uses. It is mainly used as an alloying element in permanent and soft magnetic materials, high-speed tool bits and cutters, high-temperature, creep-resisting alloys, and cemented carbide tools, bits, and cutters. It is also used in making insoluble paint pigments … Read more
Welding Sheet Metal. (1) For welding purposes, the term “sheet metal” is restricted to thicknesses of metals up to and including 1/8 in. (3.2 mm). (2) Welds in sheet metal up to 1/16 in. (1.6 mm) thick can be made satisfactorily by flanging the edges at the joint. The flanges must be at least equal … Read more
Multilayer Welding or Multiple layer welding is used when maximum ductility of a steel weld is desired or several layers are required in welding thick metal. Multilayer welding is accomplished by depositing filler metal in successive passes along the joint until it is filled (fig. 10-20). Since the area covered with each pass is small, the weld … Read more
a. General. High yield strength, low alloy structural steels (constructional alloy steels) are special steels that are tempered to obtain extreme toughness and durability. The special alloys and general makeup of these steels require special treatment to obtain satisfactory weldments. These steels are special, low-carbon steels containing specific, small amounts of alloying elements. They are quenched … Read more
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
MIG welding procedures are similar to those for other arc welding processes. Adequate fixturing and clamping of the work are required with adequate accessibility for the welding gun. Fixturing must hold the work rigid to minimize distortion from welding. It should be designed for easy loading and unloading. A good connection of the work lead (ground) … 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
TIG welding versus MIG welding machines MIG welding machines can make quick work of those around the house projects. With a basic configuration, you have your MIG welding machine set up with “gasless” filler material commonly known as “Flux Core“. It welds ok, but you find that if you want “clean” results you need a bottle of Argon/Co2 75/25% … Read more