Harsha welding systems manufactures capacitor discharge projection welding machines. The spot/projection welding machines operate on the principle of capacitor discharge. The welders use mains input power only for control and charging the capacitors that store the energy. The built-in control ensures that the stored energy is always constant irrespective of voltage fluctuations. The demand on input power, required for charging of capacitors is less. This results in saving of large kva demand and hence reduction in operational costs is possible. It would be evident from this that these welders would be a welcome investment, particularly, where voltage fluctuations are common, availability of power is scarce and the cost of high kva installations is prohibitive. The stored energy when required is discharged into weldment via pulse transformer and the weld is carried out in few miliseconds. In process actual welding area is only molten and fused together. The welded parts are clean and undistorted as there is insufficient time for heat to conduct beyond the welding area and smooth finish is obtained. The preset pressure switch maintains consistent weld quality automatically. The welders use fabricated frame structure for housing the capacitor banks, control circuits charging and discharging transformers. The welding electrodes are mounted in c-shaped quick response press mechanism and electrode movement is hydraulically/pneumatically operated. All recommended electrode materials are suitable for these welds. This technology is superior to conventional projection welding technology.
