FLASH BUTT WELDING

                               FLASH BUTT WELDING 

in flash welding, the heat required for melting is obtained by means of arc rather than the simple resistance welding. the flash welding equipment consists of essentially two plates to which two pieces to be joined or clamped.on the planes are fixed while others are movable the movement being control by means of a cam.the ends of two pieces need not be parallel and so prepared ass in the case of upset welding the two pieces are brought together and  the power is switched on.momentarirly two pieces are separated to rate the arc to melt the ends of the two pieces. the again the pieces are brought together and the powered is switched off. while the two ends are fused under the force. most of the metal molted are fused under force and would flash out through the joints.

advantages of flash welding

1. it is comparatively much quicker than butt-welding

2.on account of only a small portion of the metal consumption is less as compared to butt welding

3. a flash welding joint is stronger than the butt welding joints.

4. it also reasoned the strength of the weld produced is comparable to or even more than of the loose metal

5. length and alignment of the workpiece is maintained to a high degree of accuracy.

disadvantages of flash butt welding

1. during flashing, particles of the molten metal are thrown out, investing which may enter into the side inserting, etc.

2.cross section are  of the workpiece to be welded

3. coat of removal of flash and upset metal by trimming, chipping, grinding

4. opening between the jaws of the gripping clamp also limits the size of the workpiece

5. The operator has taken enough cave against possible fire hazards due to flashing.