You are here

High Force Servo Motor Driven Spot Welding Head - 73 Head

Designed for use in automation or benchtop welding, AMADA WELD TECH's Model 73 and Model 73-Z weld heads offer fast, repeatable electrode motion control for a wide range of resistance welding applications. The Model 73 weld head is an easy-to-program, stateof-the-art servo motor controller that allows precise programming of electrode position and speed for up to 31 different weld schedules. The 73-Z pincer weld head has self centering electrode clamping and floating mechanism to ensure the part is centered between the electrodes every time.

Key features High Force Servo Motor Driven Spot Welding Head - 73 Head

  • Programmable speed and positions
  • Controlled servo motor actuation eliminates overforce
  • Force range 15 lbs to 110 lbs.
  • Durable and robust head design
  • Displacement and force options
  • Remote control I/O and PC communication
  • Machine builder module – a module option without a lower electrode or extrusion provides convenient machine mounting
  • Fast follow-up – less weld splash, more consistent welds
  • Easy programming – fast, efficient schedule adjustment
  • “Soft-touch” part clamping – minimizes impact force – allows verification of part alignment prior to welding

Servo Motor Driven Weld Head

Programmable electrode positions – accurate to .004”

  • The “Home” position allows for easy access during maintenance.
  • The electrode is in the “Upstop” position in the “Ready” state.
  • The first level of the footswitch moves the electrode down to the “Search” position at a programmable “Soft-touch” speed.
  • The second level of the footswitch applies the pre-set welding force, with no overforce.
  • The programmable “Downstop” inhibits welding if parts are not present.


Model number 73 Head/73-Z Head
Force range 15 - 110 lbs
Weld force method Spring force setting
Actuation method Servo motor
Electrode stroke max 1.75 in
Throat depth 3.9 in (100 mm) / N/A
Number of schedules 31
Electrode speed Start point to mid point - 8 selectable speeds by schedule (20-125 mm/s) Mid point to weld point - 4 selectable speeds by schedule (5 - 30 mm/s)
Squeeze time setting 10 settings (0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 ms)
Hold time setting 8 settings (100, 200, 300, 400, 500, 1000, 2000 ms,external END signal)
Power supply 100-240 VAC ±10%, 50/60 Hz
Welding current 7500 A
Model number Model 73 HeadModel 73-Z HeadController
Dimensions (LxWxH) 274 mm x 173 mm x 468 mm (10.8 in X 6.8 in X 18.4 in)606.3 mm x 129 mm x 148 mm (23.9 in x 5 in x 5.9 in)243.8 mm x 63.5 mm x 154.9 mm (9.6 in x 2.5 in x 6.1 in)
Weight 16 kg (35.2 lbs)8.7kg (19.25 lbs)3 kg (6.6 lbs)
Terminal connections for sensors
Magnet wire to tang termination
Joining of stamped sub-assemblies

Customized Solutions

Send your sample to one of our technology centers in Europe for an evaluation. We will then determine which solution meets your needs best. AMADA WELD TECH offers feasibility testing and application consulting.