Welding Technology GMAW / MIG
Welding GMAW (gas metal arc welding) or MIG (metal inert gas) is also known as Gas Metal Arc, or MAG, where an electric arc is maintained between a solid wire electrode that functions as continuous and the workpiece. The arc and molten solder are protected by a stream of inert gas or active. The process can be used on most metals and the range of wires in different alloys and applications is almost endless.
MIG welding is inherently more productive than MMA (manual arc welding), where productivity losses occur whenever the welder stops to replace the electrode consumed. In manual arc welding is also notable loss when the remainder of the electrode which is held by the electrode holder is thrown away (in some cases it is recycled).
For every kilogram of covered electrode rod purchased, only around 65% is used as part of the weld (the rest is thrown away or recycled in some cases only). The use of solid wire and flux cored wire has increased between 80-95% efficiency of welding processes.
The MIG process usually operates in continuous current with the wire as positive electrode. This is known as “Negative Polarity” (reverse polarity), the “Positive Polarity (straight polarity) is rarely used by their low filler metal transfer from the wire to the workpiece. The welding current range from about 50 Amperes to 600 Amperes in many cases, voltages 15V to 32V, a self-stabilized arc is obtained with the use of a power supply system of constant potential (constant voltage) and a constant feed wire.
Continuous developments MIG welding process have become a process applicable to all commercially important metals such as steel, aluminum, stainless steel, copper and others. Materials above 0076 mm (.0.030-in) thick can be welded in any position, including “floor”, vertical and overhead. It is very simple to choose the computer, the electrode wire or gas from the application and the optimum conditions to produce high-quality welds at very low cost.
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