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AIR OPERATED ROCKER ARM 4649

Production Engineering’s Rocker Arm 4649 is perfect for you! This Versatile 25 KVA AC Air-Operated Rocker-Arm Type Spot Welder comes with Weld Control and has an adjustable throat depth of 15’’ – 27.6’’. Look through all of our products! 

  • 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 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° positi in the arm. Optional Universal-Style arms are available exclusively from WSI for 1” diameter electrode holders, and for mount 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

SPECIFICATION UNITS WTR-4645 WTR-4646 WTR-4647 WTR-4648 WTR-4649
Foot or Air Operated   AIR AIR AIR AIR AIR
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 50 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) 94-145 (6.5-10) 94-145 (6.5-10) 94-145 (6.5-10) 94-145 (6.5-10) 94-145 (6.5-10)
Air Consumption per 1000 Spots @ 94 psi (650kP / 6.5 bar) SCF (N/m³) 152 (4.3) 152 (4.3) 152 (4.3) 152 (4.3) 152 (4.3)
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) 363 (165) 528 (240) 363 (165)
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) 253 (115) 253 (115) 198 (90) 253 (115) 198 (90)
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) 293 (133) 310 (141) 317 (144) 315 (143) 321 (146)
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.          
SPECIFICATION UNITS WTR-4660 WTR-4661 WTR-4662 WTR-4663 WTR-4666
Foot or Air Operated   AIR AIR AIR AIR AIR
Power @ 50% Duty Cycle kVA 35 35 50 50 50
Max Power kVA 75 62 104 82 104
Secondary Voltage V 5.4-4 5.4-4 6.1 6.1 6.1
Maximum Short Circuit Current A 17,500 14,000 21,000 16,500 17,000
Thermal Current @ 100% kA 4.5 4.5 5.7 5.7 5.7
Supply Voltage (@60Hz)* V 230 or 440 230 or 440 Dual Voltage 230/440 230 or 440 230 or 440
Delayed Fuses @ 230VAC A 125 125 175 175 125
Delayed Fuses @ 440VAC A 70 70 100 100 70
Primary Cables Ø (up to 30m) mm² 16 16 35 35 35
Insulation Class F F F F F F
Compressed Air Supply psi (bar) 94 (6.5) 94 (6.5) 94 (6.5) 94 (6.5) 94 (6.5)
Air Consumption per 1000 Spots @ 94 psi (650kP / 6.5 bar) SCF (N/m³) 219-170 (6.2-4.8) 219-159 (6.2-4.5) 219-159 (6.2-4.8) 219-159 (6.2-4.5) 191-60 (5.4-1.7)
Arm Minimum Length in (mm) 11 (280) 18.9 (480) 11 (280) 18.9 (480) 15.7 (400)
Max Electrode Force @ 94 psi (6.5 bar) lbs. (daN) 935 (425) 572 (260) 935 (425) 572 (260) 1034 (470)
Working Stroke in (mm) 0.2-2 (5-50) 0.2-3 (5-75) 0.2-2 (5-50) 0.2-3 (5-75) 0.2-3.2 (5-80)
Arm Maximum Length in (mm) 23.6 (600) 31.5 (800) 23.6 (600) 31.5 (800) —
Max Electrode Force @ 94 psi (6.5 bar) lbs. (daN) 462 (210) 352 (160) 462 (210) 352 (160) —
Working Stroke in (mm) 0.2-3.7 (95) 0.2-4.7 (5-120) 0.2-3.7 (95) 0.2-4.7 (5-120) —
Short Circuit Current with Arms @ Max Length kA 12.9 10.9 14.3 12.2 —
Adjustable Arm Gap Assembly (OPTION 4638)            
Short Circuit Current with Arms @ Max Gap A 11,000 11,000 12,600 12,600 —
Minimum Gap in (mm) 7.7 (195) 7.7 (195) 7.7 (195) 7.7 (195) —
Maximum Gap in (mm) 19.7 (500) 19.7 (500) 19.7 (500) 19.7 (500) —
Water Cooling @ 36 psi (250 kP / 2.5 bar) gpm (lpm) 1.1 (4) 1.1 (4) 1.1 (4) 1.1 (4) 1.1 (4)
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) 20 20 20 20 20
Welding Time Cycles 14 21 15 24 23
Welding Current kA 13.1 10.5 16 12.4 12.7
Working Rating (Welds per Minute) #/min 15 15 15 15 15
Net Weight lbs (kg) 480 (218) 491 (223) 502 (228) 513 (233) 495 (225)
Ø Arms in (mm) 1.97 (50) 1.97 (50) 1.97 (50) 1.97 (50) 1.97 (50)
Ø Electrode Holders   25mm 25mm 1″ 25mm 1″
Electrode Taper Size   5RW/2MT 5RW/2MT 5RW/2MT 5RW/2MT 5RW/2MT
*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.
Air Operated Rocker Arm 4649

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