Flash Butt Welding Process

Flash Butt Welding Process:

In this process, the end preparation is not so detailed as in upset butt welding process described above and the ends need not be dead square. In this case, the current is switched on before bringing the two ends to be welded, close together. This results in flashing as the two ends almost touch each other but have a little gap between them. This flashing or arcing generates heat and the two metal end heat up to coalescence temperature. Current is then switched off and the two ends are brought together under pressure to complete the pressure weld. In this case also, a little upseting of material around the joint surface will take place which may be get rid off by grinding.