Author: haroonkhan

In the welding technique, a stream of high-speed electrons strikes on work surface where the kinetic energy of electrons transferred to the work material produces intense heat. The metal can melt or vaporize depending on the intensity of heat generated. The same process is also used for machining purposes. The electron beam is produced in…

In the welding technique, a stream of high-speed electrons strikes on work surface where the kinetic energy of electrons transferred to the work material produces intense heat. The metal can melt or vaporize depending on the intensity of heat generated. The same process is also used for machining purposes. The electron beam is produced in…

Laser is a highly coherent beam of electromagnetic radiation with wavelength varying from 0.1 to 70 mm. It may be used for machining or welding purposes depending on the wavelength of radiation used. Figure 20.47 shows schematic diagram of laser beam welding. A coiled xenon flash tube is placed around the ruby rod and the internal…

In a resistance butt welding process, the workpieces which are to be joined are placed end to end between two clamps and required pressure is applied (Figure 20.46). The high resistance at the joint generates heat on supplying high current and causes fusion to take place at the interface. The pressure applied ranges from 15…

In percussion welding, the welding heat is obtained by an arc produced by a rapid discharge of stored electrical energy in capacitor. The parts to be joined are placed in position similar to flash welding. The intense heat of arc melts the parts. The heated parts are then pressed together to complete the weld. This…

Flash welding is used to make an end-to-end joint of two thick metal pieces as shown in Figure 20.45. In this method, current is switched on and then the ends to be welded are brought closer slowly to make contact. Thus, heat is localized at the ends and reaches at the welding temperature. The ends, after…

Flash welding is used to make an end-to-end joint of two thick metal pieces as shown in Figure 20.45. In this method, current is switched on and then the ends to be welded are brought closer slowly to make contact. Thus, heat is localized at the ends and reaches at the welding temperature. The ends, after…

Projection welding is a variation of spot welding. Small projections are embossed at the plate where welds are desired as shown in Figure 20.44. The workpieces are then placed between large-area electrodes and current is switched on. High temperatures are generated at the projections. During the process, the projections collapse, owing to heat and pressure, and…

It is simplest form of resistance welding. In this process, a pair of water-cooled copper electrodes is used. Two overlapping metal plates are held between these electrodes’ jaws as shown in Figure 20.42. Figure 20.42 Resistance Spot Welding The pressure is applied to a very small area, which is known as spot. The resistance at the inner…