Flash Butt Welding (FBW)

The Flash Butt Welding method is used in many different applications because of its productivity and reliability in achieving a solid and consistent welding result.

Flash butt welding is one of the resistance welding processes, in which the energy transfer to the parts that are going to be joined is mainly provided by resistance heat in the parts themselves.

The workpieces are positioned end-to-end. As a general rule, the flash butt welding process is sub-divided into pre-flashing, pre-heating, flashing and upsetting. Pre-flashing is used to handle problems when the two surfaces to be joined are not parallel. Pre-heating is carried out under low welding pressure. When the welding joint has been heated to a certain temperature, flashing starts and the surface material is burned off, resulting in an even and clean joint surface. The flash consists of molten and oxidised material. After flashing, upsetting starts and presses the two surfaces together with high force to produce a good joint.

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