Machines are provided with different drive system depending on the application. Customer to specify the preferred system.
1) Direct Drive : Direct gear drive is given to any one of the wheels.
Knurl Drive- One of the wheels or both are driven.
2) Synchronous (digital) timing of 1-9 cycles ’ON’ and 0-9 cycles ‘OFF’ both in steps of one cycle each for weld time.
3) Phase shift heat control for firing the thyristors and to adjust the welding current been 50 and 100°a over and above the transformer taps.
4) High Power switching device consisting of 2 thyristors connected in inverse parallel and mounted on a water cooled heat sinks.
4) Protective devices for high voltage surges and thermo- switches are standard features.
5) Hold time having a range ot2-25 cycles to provide a delay between stoppage of weld and separation of weld wheels.
In narrow track seam welding. weld wheels are of thickness 6 mm constantly coined for circular profile which results in narrow contact with very high pressure density. Due to this high pressure density the coated material on the sheet metal is squeezed out during the welding.
