Stud Welding Unit for CD stud welding (capacitor discharge welding) according to current standards.


  • ISO – especially suitable for attaching cut-to-length ARC-ISO and Fiberfix pins; also material with high heat resistance; excellent for insulation applications in building construction and fire-resistant insulation (FRI)

Process variants

  • Short cycle drawn arc welding


  • Welding with ceramic ferrule (series)
  • Welding with shielding gas (series)
  • Automation (optional)

Technical Data

Welding range Short Cycle: #4 to 3/16″, dia. 14 ga to 3/16” (M3 to M5, dia. 2 to 5 mm)
Welding material Mild steel, stainless steel
Welding rate 10 to 15 studs/min (depending on application and stud dia.)
Capacitance 99,000 F
Welding current 800 to 2,200 A (by charging voltage)
Welding time 10 msec
Energy 2,400 Ws
Charging voltage 70 to 220 V (stepless voltage regulation)
Primary power 115/230 V, 50/60 Hz, 10 AT
Power source Capacitor
Protection class IP 23
Operational and storage conditions According to current standards
Dimension L x W x H 20.08″ x 7.09″ x 9.84″ (510 x 180 x 250 mm) without handle
Weight 57.32 lbs (26 kg)
Order No. 91-12-2401



  • 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 digital display
  • Library function – automatic specification of charging voltage through selection of stud diameter according to welding range; fine adjustment via arrow keys


  • 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) – optimal for construction sites since 3-phase current is not universally available


  • With integrated mains filter (protection against voltage peaks)
  • Optimal for construction sites with large mains voltage fluctuations – use even with critical voltage supply (- 25% + 20%)
  • 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)
  • Optimal protection against external interferences
  • Protection class IP 23
  • Also permits operation outdoors


  • Display – infinitely adjustable power setting (charge reversal via set-point switch); easy monitoring of all functions via LED displays
  • Powerful – built-in power reserves
  • Trouble-free changing of welding voltage polarity possible by reconnecting welding current and ground cables
  • Use of special capacitors (developed for stud welding)

Suitable Welding Guns

  • AI 06

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