Electric resistance welding (ERW) refers to a group of welding processes such as spot and seam welding that produce coalescence of faying surfaces where heat to form the weld is generated by the electrical resistance of material vs. the time and the force used to hold the materials together during welding. Some factors influencing heat or welding temperatures are the proportions of the workpieces, the metal coating or the lack of coating, the electrode materials, electrode geometry, electrode pressing force, electrical current and length of welding time. Small pools of molten metal are formed at the point of most electrical resistance (the connecting or "faying" surfaces) as an electrical current (100–100,000 A) is passed through the metal. In general, resistance welding methods are efficient and cause little pollution, but their applications are limited to relatively thin materials and the equipment cost can be high (although in production situations the cost per weld may be as low as $0.04 USD[citation needed] per weld depending on application and manufacturing rate).
 

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Tungsten heavy alloys are consisted of W-Ni- Fe or W-Ni- Cu or even W-Ni-Cu-Fe, some tungsten alloy is added Co.Mo.Cr and so on.The most important property for tungsten alloy cube is that small volume with high density, which means it could be applied in some fields need the little but heavy parts, especially for military defense, projectiles it play very important role. Heavy-metal tungsten alloys were identified as likely replacements, but these materials were not tested early in the munitions development process for adverse health effects as embedded fragments.Main Application of tungsten alloy: For making rotors of dynamic inertial materials, the stabilizers of aircraft wings, shielding materials for radioactive materials, containers in hospitals and for radioactive isotope (Cobalt 60), and for material of armor piercing bullets and moulds or the military use, etc.

The military tungsten alloy block part adopts the technology of metal injection molding which near net shape technology and the processing methods compared with conventional superiority is a manufacturing quality precision component. Directly manufacturing small sized part about 0.1g to 200g with complicated geometric shapes, compared to investment casting and powder metallurgy, the metal injection molding parts’ tolerance can be held to +/-0.1~0.5%, having high relative density 95 percent to 99 percent and more consistent microstructure and higher mechanical property. Without or only minute quantity of machine work needed, material use rate as high as 97%, part dimension being of small manufacture tolerance, and repeatability, adjustable material composition, fine parts surface smoothness, improvable strength and wearing resistance by heat treatment.


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Fusion welding is a generic term for welding processes that rely upon melting to join materials of similar compositions and melting points.Due to the high-temperature phase transitions inherent to these processes, a heat-affected zone is created in the material(although some techniques, like beam welding, often minimize this effect by introducing comparatively little heat into the workpiece).
Contrast with solid-state welding which does not involve melting of materials.

Types of fusion welding include:
Arc welding
Oxy-fuel welding
Electric resistance welding
Laser beam welding
Electron beam welding
Thermite welding

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Tungsten alloys enable the physical size of components to be reduced, offering greater aircraft balance/ballast weight distribution.  Machineable high-density tungsten alloys offer unmatched stabilization properties. These anti-vibration metals provide vibration dampening capabilities, making them the perfect choice for such applications as helicopter blades, aircraft ballast weights, missile components, and more.With high-density materials, aircraft balance weight can be achieved in tight spaces.

Tight tolerances, precision manufacturing and consistent quality are essential on every part.


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