RESISTANCE WELDING

Resistance spot welding (RSW) is a process in which overlapping metal parts are locally joined at the interface between them. The work pieces are clamped together between electrodes (non-consumable but they wear) while a very intense but brief welding current is sent through them. Such a high current density flowing through the limited contact areas (shortest current path from electrode to electrode) will lead to local melting. Subsequent solidification leads to weld formation at the contact surface between overlapping parts (but not between parts and electrodes).

 Application field and advantages

  • Only for overlap welds (between sheets, mesh on sheet, …) and appropriate for (very) thin materials
  • Weldability: can be applied to a variety of metals such as steels, stainless steels, nickel alloys etc., also usable for brass and aluminium but less straightforward
  • Reliable, fast and reproducible process
  • No protection gas and no filler metal needed
  • Typically used when welding particular types of sheet metal, welded wire meshes or wire mesh. It is intensely used in the automotive industry but also metal buckets, electrical connections on batteries, orthodontic components etc.

crm-facility-resistance

CRM facility

 SOUDAX (image)

  • Equipment appropriate for spot  and roll-spot welding
  • Generator frequency: 2000 Hz
  • Voltage (out): 15 kV max
  • Current (out): 10kA max
  • Spot welding duration: from 0 to 1200 ms (increments of 1 ms)

Roll-spot welding cycles: from 1 to 50 pulses/sec