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Welding history

Classification of welding

Effect of welding speed

Welding defects

Types of welding joints

Welding position

Welding electrodes

Types of welding flame

Welding flux

Welding techniques

Welding symbol

Welding edge preparation

Advantages of welding joints

Thermal properties of metal

Welding safety

Types of welds



Flash Butt Welding

Principle of flash butt welding process

Flash butt welding is the another kind of butt welding process. This is different from other welding process is the arcing action, the heat is being generated at a number of points by a series of tiny arcs. The works does not coming into actual contact until the final forging pressure is applied. This welding process can be carried out in another theory that very light contact does occur at number of points. Such this a very small area contact each other face. Very intense heating takes place and causes melt the metal. After current applied, vaporization takes place between the metal joining portion. The liquid metals are flowing due to capillary action. At the

same time the final mechanical forging pressure is applied, then welding current supply is cut off. This entire operation is performed automatically. The heating effect is generally produced by the electrical resistance at the joint face. Flush welding process is very quick welding process than butt welding process. Due to less time radiation losses, relatively less current is required and a smaller volume of metal is heated. The principle of flush welding diagram is shown in the bellow picture.

Some important factors for flush welding:

  1. Work pieces must be correctly clamped with some special type of jig.
  1. The flushing distance and upset distance must be correctly set.
  1. Rate of application of upset pressure must be very rapid indeed.

Application of flash welding

Principle diagram of Flash Butt welding

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Flash Butt welding