Welding process and welding technology

Update:05 Aug 2019

The process and welding techniques to be used for weldi […]

The process and welding techniques to be used for welding depend on the type of object to be welded and the skill and experience of the welder. MIG Welding New welders who have just learned how to weld should start with metal inert gas (MIG) welding, also known as gas shielded metal arc welding (GMAW). MIG is an arc welding that relies on the creation of a circuit through the object to be welded and a wire as an electrode. When the wire contacts the metal object, the circuit is completed. The wire is then pulled back a short distance and the resulting arc is heated to thousands of degrees Fahrenheit to melt the wire and melt the two metal parts. This creates a molten pool in which all three metals combine to form a single bead along the weld when cooled and solidified. As the weld continues to weld down, the wire melts and continuously feeds more wire from the tip of the torch. At the same time, the gas diffuses from the lance and spreads around the arc to protect the weld zone from contaminants in the air, such as oxygen and nitrogen.

Welding requires more skill and provides greater precision. When the arc creates a weld pool from two workpieces, the heat of the weld pool melts the filler rod and the torch disperses the protective gas to protect the new weld. The welding device regulates the current flowing through the circuit generated between the metal object and the tungsten electrode. This can be used to slowly increase or decrease the amount of heat applied to the metal, which can help prevent brittleness caused by thermal shock. When the flux melts during the welding process, liquid slag and gas are generated to protect the weld from contamination.