THOMSON
HEAVY DUTY PRESS TYPE WELDERS

Versatile Thomson Model A-1 and A-2 press type heavy duty welders meet RWMA standards. They are manifactured as projection, combination spot projection, or spot only welders with a variety of transformer sizes and throat depths. Optional tooling is available for special applications. Designed with your operation in mind, these rugged welders feature efficiency, ease of operation and simplicity of maintenance and construction.

STANDARD FEATURES

Frame and Neck - Heavy fabricated steel, rigidly constructed to minimize deflection under maximum load.

Upper Welding Head - Air operated press type anti-friction head including aluminum ram and cam roller type bearings operate against hardened and ground adjustable ways.

Air Cylinders - The fixed 4" stroke double acting cylinder (standard equipment) is used for routine welding. The adjustable stroke cylinder (optional) is used for air conservation and faster operation. The adjustable retractable stroke cylinder (also optional) is used to provide a longer retraction stroke of the head to insert or remove work over obstructions while allowing the use of a short welding stroke. Both adjusatable type cylinders have a 0" to 4" stroke.

Transformer - 30, 50, 75, 100, 150, 200 KVA heavy duty  transformers have a stacked core and are water cooled. Each transformer has a 50% duty cycle rating in accordance with RWMA standards. Standard voltages of 230 and 460. Other voltages available upon request. A multi-position tap switch is standard on all welders.

Air System - The air system includes a pressure regulator, lubricator, dual-speed control valves, pressure gauge, and solenoid valve.

Control Systems - A wide selection of powerful and economical programmable microprocessor controls can be specified with the following features:

  •  
Automatic line voltage compensation
  •  
Automatic power factor adjustment
  •  
Multi-scheduling

This control flexibility permits difficult welding operations to be performed reliably at minimum cost.

Water Cooling - A series water circuit is standard. Water cooling is supplied to the electrodes, transformer, and welding controller.

Knee Brace - Standard on 18" or longer throat depths.

Initiation - By double stage foot switch.

OPTIONAL ACCESSORIES

  • Special electrodes or electrode holders
  • Single stage foot switch
  • Adjustable pressure switch
  • Adjustable stroke cylinder
  • Retractable air cylinder
  • Adjustable retractable air cylinder
  • Universal arm - 90 degrees one end, 60 degrees other end
  • Pneumatic electrode dresser (with blade/ chuck combo)
  • Quick disconnect water fittings (set of 4) for holders/tooling
  • Water flow switch
  • Special holders/arms/tooling
  • Special voltages/multiphase
  • Air reserve tank
  • Visual water flow indicator
  • Adjustable pressure tip dress
  • Low pressure tip dress
  • Control circuit breaker/disconnect
  • Various control options
  • Remote weld/no weld switch
  • Water filter package
  • Water chillers
  • Dual palm buttons with emergency stop (anti-tie down)
  • Emergency stop only
  • Remote schedule selector

MODEL A1
STANDARD MAXIMUM ELECTRODE FORCE AT 80 PSI

Machine Type

Throats

12 18 24 30
Spot ---- 2260 1570 1000
Projection 2260 1570 100 ----

MODEL A2
STANDARD MAXIMUM ELECTRODE FORCE AT 80 PSI

Machine Type

Throats

12 18 24 30 36
Spot ---- 4000 3078 3078 2260
Projection 4000 3078 3078 2260 2260