Fusion welding

[1] Due to the high-temperature phase transitions inherent to these processes, a heat-affected zone is created in the material[1]: 755  (although some techniques, like beam welding, often minimize this effect by introducing comparatively little heat into the workpiece[2]).

Fusion welding has been a critical factor in the creation of modern civilization due to its vital role in construction practices.

Besides bolts and rivets, there are no other practical methods for joining pieces of metal securely.

Fusion welding is used in the manufacture of many everyday items, including airplanes, cars, and structures.

Beyond construction, a large community uses both arc and flame contact welding to create artwork.

Arc welding machines are portable and can be brought onto job sites and hard to reach areas.

Ship hulls are repaired and oil rigs are maintained with underwater arc welding.

The laser beam can be split and sent to multiple locations greatly reducing the cost and amount of energy required.

Laser beam welding finds applications in the automotive industry.

However, there are no points of contact between the metal being welding and the electrical source or the welder.

Certain compounds when mixed create an exothermic chemical reaction, meaning they give off heat.

A very common reaction uses thermite, a combination of a metal oxide (rust) and aluminum.