• Description
  • Front Panel Functions
  • Features
  • Benefits

The Automatic Torch Control (ATC II) is a compact, lightweight, weld torch manipulation control system comprised of the microcontroller based Automatic Torch Control and a stepper motor driven Linear Slide Assembly (LSA). This system is capable of providing independent control of all torch movements in the vertical plane. Employing patented "Thru-Arc™" tracking technology, the system provides automatic torch height control for both GTAW, PAW and GMAW applications.

The ATC II provides automatic torch height and two modes of Torch Height Control. Mode 4 provides Torch Height Control using Arc Voltage Control (AVC). Mode 5 provides torch height control using Arc Current Control (ACC). The entire torch tracking information is derived from the welding arc. The arc voltage and welding current is measured with an external voltage probe and Hall-Effect clamp on current sensor provided with the system. The two modes allow the ATC to be used for GTAW, PAW and GMAW applications. The ATC II also provides a Touch-Retract function for accurate torch positioning at arc start for GTAW applications.

The ATC II provides a user definable 50 sequence Programmable Logic Controller (PLC) with four 24 vdc inputs and two N.O. relay contacts. Using the ATC II PLC, the user can define how the ATC II™ will interface to an external control system. It can also be used to provide external system control and a simple power source interface.

The ATC II Control provides the necessary control signals to the stepper motor powered slide. At power-up the slide is driven to the upper limit then the torch will be located to a user defined start location. The front panel controls allow the user to define the starting position, tracking reference values and to Enable/Disable the tracking functions. The ATC II will automatically detect a valid arc active condition and will perform the selected torch height tracking function. During the weld the user can Enable/Disable the Torch Tracking function. A RS-232 serial port is provided for off-line PLC programming and ATC II control system configuration.


The Automatic Torch Control provides the necessary command signals to the stepper motor powered drive to permit the selection of the following functions from the front panel.

Run Enable Slide Home upon power up and auto arc detect
Track Enable/Disable Thru-ArcT AVC/ACC tracking
Jog Jog the Torch slide position up or down
Speed Control the speed of the slide
Gain Provide sensitivity control for all tracking functions


RS-232 Serial Port
All tracking information derived from welding arc
User definable 50 sequence P.L.C.
Stepper motor driven slide assembly
External interface capability
Compact lightweight design
Convenient flexible mounting

Permits off-line programming, system configuration and remote control
No bulky probes to contend with or maintain
Permits independent control of all welding torch movements in the vertical plane
Easy system integration for automated applications
Adaptable in confined areas
The slide can be installed in any position using multiple mounting positions and optional brackets
Product Specifications




  • ATC II
  • Light Duty Slide
  • Medium Duty Slide
  • Heavy Duty Slide
AVC Control Range 2.0—25.5 vdc; Resolution 0.1 VDC; Max Slew Rate 1.5 inch/sec
ACC Control Range 100—560 ADC; Resolution 2 ADC; Max Slew Rate 1.5 inch/sec
Dimensions 6.62” H x 4.12” W x 8.75”L (168mm x 105mm x 222mm)
Power Requirements 115/220 vac 50/60 Hz @ 220 va
Operating Temperature -10° F to +140° F (-23° C to +60° C)
Weight 5.5 lbs (2.5kg)
Velocity 0.25 - 15 inch/minute
Motor Torque 120 oz-in max (Holding Torque)
Dimensions 13.25”H x 4.7”W x 3.5”D (336mm X 102mm x 89mm)
Max Travel 7.25” (184 mm)
Weight 7 lbs (3.18kg)
Velocity 0.2 - 1.5 inch/sec
Weight Capacity 10 lbs @ 3” from slide face
Dimensions 16.66”H x 3.38”W x 2.88”D (423mm X 86mm x 73mm)
Max Travel 7.25” (184 mm)
Weight 7 lbs (3.18kg)
Velocity 0.2 - 1.5 inch/sec
Weight Capacity 25 lbs @ 3” from slide face
Dimensions 17.08”H x 5.00”W x 2.63”D (434mm X 127mm x 67mm)
Max Travel 7.25” (184 mm)
Weight 9-1/2 lbs (4.32kg)
Velocity 0.2 - 1.5 inch/sec
Weight Capacity 45 lbs @ 3” from slide face
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