Welding and Joining Processes - Flash Butt Welding

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Flash butt welding is a development of resistance butt welding and is particularly suitable for butt welding complex or larger sections. It is used for a wide range of component shapes and sizes from bicycle wheel rims to rails. More efficient energy input, and a more localised and evenly heated zone can be achieved, compared with resistance butt welding.

In flash butt welding, the components are clamped between dies and brought together slowly with the current switched on. Current flows through successive points of contact which heat rapidly, melt and blow out of the joint giving the characteristic flashing action. After a pre-set material loss has occurred, sufficient to heat the material behind the interface to its plastic state, the components are forged together to expel melted material and contaminants. This completes a solid phase forge weld. The joint is then allowed to cool slightly under pressure, before the clamps are opened to release the welded component. The weld upset may be left in place or removed, by shearing while still hot or by grinding, depending on the requirements.

Suppliers With This Capability

Amiga Engineering Pty Ltd   Tullamarine VIC