Welding

Definition and Process of Welding

Welding is a fabrication process that joins materials using high heat to melt the parts together and allowing them to cool, causing fusion.
It is distinct from brazing and soldering as it melts the base metal.
A filler material is typically added to the joint to form a pool of molten material that cools to form a strong joint.
Pressure may also be used to produce a weld.
Welding requires a shield to protect the metals from contamination or oxidation.

Gas flame, electric arc, laser, electron beam, friction, and ultrasound can be used as energy sources for welding.
Different energy sources have different applications and advantages.
Gas metal arc welding (GMAW) and shielded metal arc welding (SMAW) are popular methods.
Welding can be performed in various environments, including open air, underwater, and in outer space.
Precautions are necessary to avoid hazards such as burns, electric shock, and exposure to poisonous gases and radiation.

Forge welding was the only welding process until the end of the 19th century.
Arc welding and oxy-fuel welding were among the first processes to develop.
Manual methods like shielded metal arc welding became popular.
Semi-automatic and automatic processes such as gas metal arc welding and flux-cored arc welding were developed.
Laser beam welding, electron beam welding, and friction stir welding were invented in the latter half of the 20th century.

The history of joining metals goes back several millennia.
Glaucus of Chios is credited with inventing iron welding in ancient Greece.
Forge welding was used in the construction of the Iron pillar of Delhi in India.
Middle Ages brought advances in forge welding techniques.
Vannoccio Biringuccio published a book that included descriptions of the forging operation.

Sir Humphry Davy discovered the short-pulse electrical arc in 1800.
Russian scientist Vasily Petrov created the continuous electric arc in 1802.
Metal electrodes were invented in the late 1800s.
Coated metal electrodes and three-phase electric arc welding were proposed.
Resistance welding and thermite welding were developed in the late 19th century.

Reference	URL
Glossary	https://harryandcojewellery.com.au/blogs/glossary/welding
Wikipedia	http://en.wikipedia.org/wiki/Welding
Wikidata	https://www.wikidata.org/wiki/Q131172
Knowledge Graph	https://www.google.com/search?kgmid=/m/0c71s