Stud Welding Unit (with wide range power supply) for CD stud welding and short cycle drawn arc stud welding according to current standards


  • Especially suitable for thin sheets (at least 0.5 mm), only CD
  • Capacitor discharge and short-cycle drawn arc stud welding possible with one stud welding unit
    Capacitor discharge – especially suitable for dia. 10 mm (collar stud) welding elements and problematic surfaces (e.g. galvanised sheets)
    Short cycle drawn arc stud welding – requires only single-phase 85 to 265 V wide range power supply (no 460 V 3- phase current); for welding short cycle welding elements; best reproducibility of welds through storage of welding energy in capacitor battery prior to each weld;

Process variants

  • Contact welding
  • Gap welding
  • Short cycle drawn arc welding


  • Welding with shielding gas (series)
  • Automation (series)

Technical Data

Gas/Automation Series/Series
Welding range CD welding: #4 to 7/16″, dia. 14 ga to 3/8″ #4 to 5/16″, dia. #4 to 1/4″
Short Cycle: (M3 to M10, dia. 2 to 10 mm) (M3 to M8, dia. 3 to 6 mm)
Welding material Mild steel, stainless steel (aluminum and brass only CD welding)
Welding rate CD welding: 15 to 40 studs/min (depending on application and stud dia.)
Short Cycle: 8 up to 15 studs/min (depending on application and stud dia.)
Capacitance CD welding: 132,000 µF/66,000 F
Welding current Short Cycle: 900 to 3,000 A, stepless (over charging voltage)
Welding time CD welding: 1 to 3 msec
Short Cycle: 5, 10, 15 msec
Energy 3,200 Ws/1,600 Ws (with change over of capacitors)
Charging voltage 50 to 220 V (stepless voltage regulation)
Primary power 85 to 265 V ~ wide range selection 50/60 Hz, 10 AT
Power source Capacitor
Cooling type F (temperature controlled cooling fan)
Protection class IP 21
Operational and storage conditions According to current standards
Dimension L x W x H 23.62″ x 9.45″ x 11.02″ (600 x 240 x 280 mm) without handle
Weight 63.93 lbs (29 kg)
Order No. 91-12-2321



  • Microcontroller – for precise process times, optimal functional reliability and maximum operating convenience
  • Function monitoring – automatic function test following power-up; monitoring of all internal system functions
  • Display of error codes – on LCD display
  • Lift test – for gap welding guns and stud welding heads
  • Library function – 8 programs (charging voltages) can be stored; library with stored welding parameters; additional customer-specific entries possible; user interface available in various languages; display of charging voltage in volts
  • Process monitoring – recording and analysis of factors affecting the welding process by means of the process-
    analysis factor (PAF); after each weld, the reference PAF value is compared with the actual value; display of the
    actual and reference values; switchable automatic welding stop, if limits are exceeded; limits selectable in increments;
    manual entry of PAF value possible (only CD)
  • RS232 interface – for data output; data and time of day are stored; welding parameters of each weld are logged (only CD)


  • Extremely easy to operate
  • Compact
  • Robust – metal housing withstands rough treatment in shop and on site
  • 115 V mains connection (instead of 460 V 3-phase current connection)


  • With integrated mains filter (protection against voltage peaks)
  • Use even with critical voltage supply
  • EMC test
  • High-voltage test with log
  • Retriggering lock-out – prevents welding on a welding element that has already been set
  • Thermal monitoring of transformer and internal temperature of stud welding unit- automatic shutdown in case of overheating
  • Temperature-regulated ventilator – reduces noise and dust in the stud welding unit (greater system reliability)
  • Control unit galvanically separated from welding lines – high degree of functional safety
  • Optimal protection against external interferences


  • Display – infinitely adjustable power setting (charge reversal via set-point switch); easy monitoring of all functions via LCD display; user-friendly operation via large LCD display
  • Powerful – built-in power reserves
  • Electronic regulation of charging – allows high clock rates
  • Trouble-free changing of welding voltage polarity possible by reconnecting welding current and ground cables
  • Use of special capacitors (developed for stud welding)
  • Welding current setting – infinitely adjustable from 900 to 3,000 A (via charging voltage)
  • Capacitance switching – 66,000 F or 132,000 F
  • 2 in 1 – switchable from capacitor discharge to short-cycle welding

Suitable Welding Guns

  • C 08
  • CA 08
  • PAH-1
  • KAH 412


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