TWi-250CP: 1/4″ Cuphead Pin Capacitor Discharge System

The TW-i series of capacitor discharge stud welders incorporates the latest solid state technology into a compact, light-weight, and rugged CD stud welder. This full line of equipment is capable of welding pins, cuphead pins, and CD studs ranging from 14-gauge up to 3/8” full-flanged stainless steel studs.

TWi250CP Manual



  • —NEW FEATURE— Intuitive Touchscreen Interface with Preset values for fast, accurate, and repeatable weld settings
  • —NEW FEATURE— Set-Point Discharge: Unit discharges directly to a new set point without needing to discharge completely
  • —NEW FEATURE— Universal Input Voltage: Plug and play, no need to re-tap the machine for 110V or 220V input voltages
  • —NEW FEATURE— Low input voltage capability enables operation with long extension cords
  • —NEW FEATURE— Contact and Trigger Indicators for fast troubleshooting of hand tool and weld cable maintenance issues
  • —NEW FEATURE— Thermal and Voltage protection indicators to protect the unit from damage due to overheating or poor input power
  • Rigid internal construction minimizes the possibility of components coming loose during rough handling or operations
  • Sheet metal is powder-coated for greater durability, texture, and appearance.
  • Hand tool has been ergonomically designed to reduce operator fatigue for increased welding efficiency
  • Hand tool has an adjustable internal spring to apply the correct spring pressure for every welding application
  • Hand tool can be configured for "B" collets, "CI" collets, Euro collets, or standard tapered chucks
  • The TWi-250CP unit weighs less than most other available models for ease of carrying.

TWi-250CP Specifications

14” L, 10.5” W, 11.5” H
356mm x 267mm x 292mm
18 lbs.
Weld Energy:
1520 Watt-seconds
Weld Range:
14 gauge through 1/4" stainless
Duty Cycle:
18 studs per minute @ 1/4" settings
Primary Power:
85-250 VAC, 6.0-2.0A, 50/60Hz
10A Fast Acting Fuse
Charge Voltage:
35-200 VDC