ARC WELDING, electric current between an electrode and the base material, protective gases, MIG and MAG methods (Metal Inert Gas/Metal Active Gas), consumable or non-consumable electrodes, OXY-FUEL WELDING, combustion of acetylene and oxygen, welding flame of temerature about 3100° C, not used for aluminium or stainless steel, gas welding, RESISTANCE WELDING, current passes through resistance, electrical resistance of the metals, mostly usem for sheet metal, no filler metal or consumable electrodes, ENERGY BEAM WELDING, laser/electron beam, lens or vacuum needed, thin and deep weld is achieved, stronger, faster, more focused energy

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