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FOOT OPERATED ROCKER ARM 4642

Production Engineering provides only the best in Foot Operate Rocker Arms, and the Rocker Arm 4642 is no exception. The 4642 is a versatile 20 KVA AC Foot-Operated Rocker-Arm Type Spot Welder with TE101 Weld Control. There is also a parts breakdown and an operator manual so you can have a solid understanding of your new welder. If you have any questions, don't hesitate to contact us.

  • TE101 Control, mounted on the front of the machine, allows operator to view data while welding.
  • UNITROL SOFT TOUCH Pinch Point Safety System option
  • Air Pressure Gauge, Regulator Knob, and Speed Controls are mounted at the top of the machine for easy monitoring and adjustment.
  • Water-cooled transformer, arms and electrodes. Epoxy resin coated transformer for maximum protection.
  • Adjustable electrode stroke enables access to a greater range of parts.
  • Chromium-copper electrode holders are designed for long life and heavy-duty service. May be mounted at 12° and 90° positions in the arm. Optional Universal-Style arms are available exclusively from WSI for 1” diameter electrode holders, and for mounting the electrode holders at 30° and 90°.
  • Adjustable throat depth enables maximum flexibility.
  • Ergonomic frame for long term operation in production environments.
  • WSI Exclusive Standard Low-Profile Lower Holder enables accessing parts as small as 3” diameter.
  • Single Foot Pedal (standard).
    Additional foot pedal (optional part #73070) on base allows mounting both foot pedals on a common base.


* Features and specifications may vary, and are subject to change without notice

SPECIFICATIONS UNITS WTR-4640 WTR-4641 WTR-4642 WTR-4643 WTR-4644
Foot or Air Operated   FOOT FOOT FOOT FOOT FOOT
Power @ 50% Duty Cycle kVA 16 20 20 25 25
Max Power kVA 35 48 39 68 55
Secondary Voltage V 3.4 4 4 4.6 4.6
Maximum Short Circuit Current A 12,500 14,500 12,000 18,000 14,500
Maximum Welding Current on Aluminum kA – – – 16.3 –
Maximum Welding Current on Steel kA 10 11.6 9.6 14.4 11.6
Thermal Current @ 100% kA 3.3 3.5 3.5 3.8 3.8
Supply Voltage (@60Hz)* V 230 or 440 230 or 440 Dual Voltage 230/440 230 or 440 Dual Voltage 230/440
Delayed Fuses @ 230VAC A 80 80 80 100 100
Delayed Fuses @ 440VAC A 30 40 40 50 50
Primary Cables Ø (up to 30m) mm² 10 10 10 16 16
Insulation Class F F F F F F
Compressed Air Supply psi (bar) – – – – –
Air Consumption per 1000 Spots @ 94 psi (650kP / 6.5 bar) SCF (N/m³) – – – – –
Arm Minimum Length in (mm) 9.0 (230) 9.0 (230) 15.0 (380) 9.0 (230) 15.0 (380)
Max Electrode Force @ 94 psi (6.5 bar) lbs. (daN) 528 (240) 528 (240) 330 (150) 528 (240) 330 (150)
Working Stroke in (mm) 0.3-1.7 (8-44) 0.3-1.7 (8-44) 0.4-2.4 (10-60) 0.3-1.7 (8-44) 0.4-2.4 (10-60)
Arm Maximum Length in (mm) 21.7 (550) 21.7 (550) 27.6 (700) 21.7 (550) 27.6 (700)
Max Electrode Force @ 94 psi (6.5 bar) lbs. (daN) 209 (95) 209 (95) 176 (80) 209 (95) 176 (80)
Working Stroke in (mm) 0.6-3.3 (15-85) 0.6-3.3 (15-85) 0.6-4.1 (15-105) 0.6-3.3 (15-85) 0.6-4.1 (15-105)
Short Circuit Current with Arms @ Max Length kA 8.4 10 8.8 13 10.5
Water Cooling @ 36 psi (250 kP / 2.5 bar) gpm (lpm) 1 (3.8) 1 (3.8) 1 (3.8) 1 (3.8) 1 (3.8)
Minimum Water Pressure psi (bar) 36 (2.5) 36 (2.5) 36 (2.5) 36 (2.5) 36 (2.5)
Aerial Noise Produced dB(A) <70 <70 <70 <70 <70
Measured Conditions            
Working Stroke in (mm) 0.79 (20) 0.79 (20) 0.79 (20) 0.79 (20) 0.79 (20)
Welding Time Cycles 21 17 26 14 20
Welding Current kA 9.4 11 9 13.5 11
Working Rating (Welds per Minute) #/min 10 10 10 10 10
Net Weight lbs (kg) 297 (135) 315 (143) 321 (146) 319 (145) 326 (148)
Ø Arms in (mm) 36 40 40 40 40
Ø Electrode Holders   19mm 22mm 7/8″ 22mm 7/8″
Electrode Taper Size   4RW/1MT 4RW/1MT 4RW/1MT 4RW/1MT 4RW/1MT
*May be supplied capable of operating on other voltages/frequencies. Please ask for details.        
  • Arm depth is adjustable by up to 12.6” (320mm) depending on your working requirements.
  • Adjustable Drop Arm Assembly, Option 6030, is available on all models. Note that larger arm gap reduces available welding current. The greater the spacing between the arms, the lower the welding current available at the electrodes.
Foot Operated Rocker Arm 4642

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