Arc Welding

 

The welding of metals is by melting the two surfaces and allowing the molten metal to mix with the molten filler in case used to form a homogenous joint on solidification. Shielded metal arc welding (SMAW or MMAW) is a very popular method and has several advantages due to its flexibility for shop floor as well as site applications.

Gas tungsten arc welding (GTAW) uses inert gas as shielding gas and a non consumable tungsten electrode provides the arc for melting the base metals and filler rod. This process is employed where high joint quality is required. Gas metal arc welding (GMAW) uses a consumable wire continuously melted with an arc for higher deposition rates. Higher productivity is achieved with CO2 gmaw and inert gas shielded gmaw. Submerged arc welding ( SAW ) , Electro gas welding (EGW) and elctro slag welding processes are required to be used for heavy thickness welding applications.

Plasma arc welding (PAW) is a special process which is a variation of GTAW.This process uses a plasma column generated by a specifically designed nozzle. This facilitates single pass welding for deep penetration welding for critical applications.

 

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