Welding is a type of fabrication process, which joins two materials; the type of these materials is usually metals or thermoplastics by causing fusion. Welding is different from other joining techniques such as brazing or soldering which uses relatively lower temperature. A filler material makes the joint stronger than the base material. Some of the best welding methods include:
- Shielded metal arc welding (SMAW)- it is also termed as electric welding. It uses an electrode with flux around it to help protect the weld puddle.
- Gas tungsten arc welding (GTAW)- it is one of the best welding techniques available. Its other name is TIG and it uses a tungsten electrode to produce the weld.
- Gas metal arc (GMAW)- it is termed as MIG or metal inert gas. It uses a wire feeding gun and an argon based gas or a mix of carbon dioxide and argon.
- Flux cored arc (FCAW) - it is very similar to MIG except that it uses a special tubular wire. It can be used with or without shielding gas, depending on the filler.
- Submerged arc (SAW) – it uses an automatically consumable electrode with a granular fusible flux.
- Electroslag (ESW) – A productive single pass process made mainly for thicker materials with a range in size of 1 inch and 12 inches.
The two most popular processes are TIG or tungsten inert gas welding and MIG or metal inert gas welding. The TIG process uses a tungsten electrode, which also includes a filler rod. There is also an inert gas, which shields the tungsten electrode. A constant current welding power supply is often used to produce the electrical energy. The TIG technique can be used to weld metals like alloys of aluminum and magnesium. The TIG welding is relatively slower than other welding processes but is capable of producing a very high quality weld.
- It uses a non-consumable tungsten electrode during the welding process, and a number of shielding gases including helium (He) and argon (Ar)
- It is very useful for thin materials
It produces very high quality, superior welds
- It gives the operator full control over welding variables like heat
- Minimal distortion
- Leaves no signs of slag or splatter
- TIG welding equipment gives you good looking weld beads
- Excellent for metals of variable thicknesses, including very thin metals. The gas tungsten arc welding process is excellent for joining thin base metals because it has better control of heat input.
- It creates strong and powerful joints.
- It is a much slower process than other consumable electrode arc welding processes
- It takes a lot of practice
- It is a relatively more expensive process
Post time: 02-05-2017