Flash welding

In the flash-butt welding is a welding process. The welding heat required is generated by electric current. The heat is generated using the electrical resistance in the weld zone due to the flow passage in the form of an arc.

When joint welding of railway rails are used to generate typical of 40-100 kA current at 6-15 V voltage corresponding to large apparatus needed. This procedure (symbol RA), but more recently used regularly in rail welding plant in the track. It shortens the rail through material consumption somewhat.

The route with the - by 2014 - the world's highest capacity, the Australian Fortescue railway was built 2006-2008 by flash welding.