Pneumatic Weld Heads

The application and control of force during the resistance welding process is extremely important. The mechanical system to do this is generally referred to as the weld head. The weld head (including the welding electrodes), functions to force the workpieces together and hold them during the weld. The weld head provides the current path, welding pressure or force, triggers (initiates) the weld current, provides follow-up force as the workpieces melt together, and cools the workpieces after the weld. Pneumatic weld can be used with a force firing module or cylinder only (non-force fired) and are actuated using a foot pedal.

Force fired weld heads:

resistance welding, resistance spot welding, micro welding
  • Use air cylinder to drive a force tube or force module
  • Force tube or module is spring loaded for fast follow up
  • Internal switch detects the set force and sends firing signal to weld control
  • Force is set manually using rotary knob
  • Impact force is controlled by flow control knobs
  • If EZ/Air equipped, incoming and outgoing air pressure is locked in the cylinder upon reaching firing force

Non-force fired weld heads:

  • Use air cylinder to drive a moving mass or ram
  • No firing switch, firing is based on time by the weld control
  • Force is set by adjusting regulated air pressure or by proportional regulator
  • Generally use Belleville® washers for fast follow up
  • Impact force controlled by flow control valves


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