[mrjohngoh] had the need to join two pieces of sheet metal. Instead of purchasing a commercial unit, he set out to make his own spot welder. A spot welder works by passing an electric current ...

[Aaron Christophel] has a battery spot welder that costs a not unreasonable ... Then the end comes off the extruded aluminium case, and the guts of the device are slid out for a teardown.

BYU and Toyota developed a new welding technique for aluminum minivan doors. The refill friction stir spot welding method uses less energy and produces stronger welds. This innovation could set a ...

A spot of intense heat melts both materials ... One shows a delicate spiral of borosilicate glass neatly fused to a piece of aluminium. Welds like these will stand the tests of time and temperature.