Mini Spider | Fillet Welding Tractor

Mini Spider

The Mini Spider is a battery-powered welding tractor designed to produce continuous fillet welds using MIG/MAG torches. The torch can be easily swapped from one side of Mini Spider to another.


Horizontal speed
0–120 cm/min
Vertical speed
0–110 cm/min
Torch placement
on either side
Welding in
narrow spaces
Weight 7,6 kg

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Key features

4-wheel drive system with magnetic traction and a feedback loop provides highly efficient speed stabilization.

Constant, continuous and repeatable travel speed enables weld bead geometry that is exact to the required specifications, thus reducing costly over welding and substantially decreasing filler metal usage.

  • Compact and lightweight design to weld in narrow spaces
  • Convenient 18 V DC battery supply (the same battery for both Mini Spider and Gecko Battery)
  • Torch placement on either side
  • Welding edge to edge
  • Closed-loop speed control system based on electric motor with encoder – ensures increased speed accuracy
  • Consistent heat input reduces distortion
  • Reduces wasted filler metal – eliminates over welding
  • Digital LED display for presetting of travel speed and diagnostic messages
  • Low-battery indicator
  • Built-in guide rollers

Torch placement on either side

Welding edge to edge

Welding in narrow spaces

Product Video


Make sure you are familiar with Promotech Mini Spider | Fillet Welding Tractor brochure including technical data and detailed information about this product. Should you have any further questions we encourage you to send us an enquiry.

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Technical specification

Voltage18 V DC, 4.0 Ah
Power25 W
Welding position
(according to EN ISO 6947 and AWS/ASME)
PB / 2F
PD / 4F
Torch diameter16–22 mm
Min. workpiece thickness4 mm (0.16”)
Ground clearance4 mm (0.16”)
Horizontal pulling force150 N
Vertical pulling force100 N
Horizontal speed *0–110 cm/min
(0–43.3 in/min)
Vertical speed *0–100 cm/min
(0–39.4 in/min)
Weight (w/o battery)7.6 kg (22 lbs)
Product codeWOZ-0735-10-00-00-0
* With battery fully charged

New control system of battery pack

Detection and supervised parameters:

  • too low and too high voltage
  • too low and too high temperature
  • failure of the temperature sensor
  • internal battery failure


  • over discharge protection
  • extended battery life
  • high level of safety for both tractor and operator

Optional accessories

Torch holder

Battery 4.0 Ah

LDW-0738-10-00-30-0 (EU)
LDW-0738-06-00-30-0 (AUS/NZ)
LDW-0738-04-00-30-0 (UK)

Cable anchor

Power cord 3 m (10 ft)
PWD-0466-18-00-00-0 (230 V CEE)
PWD-0466-16-00-00-0 (115 V USA)
PWD-0466-23-00-00-0 (115 V UK)