857 Keith Lane, Owings, MD 20736     |     800.604.9653     |     Monday-Friday 8am-5pm

Pro Spot i4S Auto Welder

Chesapeake Automotive Equipment

i4 Inverter Resistance Spot Welder



Auto Weld


At the press of a button, the i4s measures the thickness of the metals automatically using the latest optical technology.


The i4s senses the metals to be welded from a pre-delivered current to determine the type of metal.


The i4s features a new cable-gun. Based on the thickness and resistance feedback information, the i4s delivers the correct weld power every time, regardless of type of metal or thickness.

The New I4S Gun

The i4s features an all new, advanced welding gun with an on-gun display screen that allows instant feedback on every weld performed. The new i4s gun, with 360-degree arm rotation, also has fingertip controls allowing the user to change settings without needing to return to the machine every time they need to adjust weld parameters. The tech can freely move throughout the vehicle repair process in a fast and efficient manner.

Wireless Connectivity

Exchanging the arms on our weld guns is quick and easy.

With built-in Wi-Fi the i4s now allows users to instantly connect with Pro Spot for the latest software updates, training videos and content. This wireless connection also gives users the ability to export weld logs to meet the increasing demands from OEMs, insurance companies and certification programs. Servicing your equipment is easier than ever before, instantly share information with Pro Spot for quick and easy troubleshooting. This feature helps eliminate guess work and downtime so that shops can remain productive and profitable.

Export Logs

Take the guess work out of troubleshooting. Export logs directly to Pro Spot and get solutions and answers to any question.

Access Training Instantly

Having the i4s always connected allows users to stay up to date with the latest in training teachniques.

Training Made Easier

The i4s now makes training easier than ever. Train directly on the machine with onboard traning videos and files. The i4s has built-in headphone jacks and speakers to help with training. It doesn’t matter if it’s a loud shop environment or quite space, plug in or turn up the volume for the speakers to start training instantly.

Newly Redesigned Cooling System

The i4s now has water cooling all the way through the gun to the tips. The water cooling is a loop-based system that cools the transformer weld cables and spot gun. While the water cooling is running the welder can operate as normal.

Technical Specifications

Input Voltage:3 phase
208 – 240V 50/60HZ
400 – 420V 50/60HZ
460 – 480V 50/60HZ
Welding Amperage:12500A max (3-phase)
Weld Cable Length:8.75′ (2.667m)
Cooling System:Radiator/Pump Active Loop
Cooled To The Caps
Microprocessor:Wirelessly Upgradeable Software Platform
Protection:IP 21
Shipping Weight:373 lb (169kg)


  • In-Gun Display Screen
  • Finger Tip Controls
  • Water-Cooled Gun & Arms
  • Wi-Fi Connection – On-Board Wi-Fi
  • Software Updates Always Available
  • Built-in Audio and Video Playback
  • Touch Screen
  • Auto Weld Mode
  • Manual Weld Mode
  • Single-Sided Welding
  • Intertek

Intertek Certified

Chesapeake Automotive Equipment