K-BUG 4000

Magnetic Travel Carriage for Horizontal Fillet Welds

The K-BUG 4000 is a compact, digital fillet welder designed to deliver precision and consistency for horizontal or stitch welds along a vertical wall. Ideal for confined spaces, this system can operate just inches from the floor, making it a powerful solution when space is limited.

This advanced welding carriage performs smooth, high-quality continuous fillet welds at a constant speed, reducing operator fatigue, improving weld accuracy, and minimizing defects. By automating the torch motion, the K-BUG 4000 allows welders to focus on puddle control while the machine ensures uniform travel and deposition.

Engineered to follow vertical or inclined walls with straight or curved profiles (R > 1000 mm), it uses precise guide wheels that track the workpiece for accurate, repeatable weld placement. Its digital programming optimizes puddle build, crater fill, and overall weld quality, eliminating over-welding and reducing rework.

Features:

Compact design: 14.6 x 8.9 x 11.3 in (370 x 226 x 288 mm)
Lightweight construction: 14 lb. (6.4 kg)
Advanced digital technology ensures accuracy
Digital speed display
High torque, low inertia motor for precise stops and starts
Drive unit motor overload protection
Powerful permanent magnets provide reliable wall grip
Carriage Travel and arc start in one switch
Guide wheels track the workpiece for steady weld travel
Closed-loop speed control provides adjustable and repeatable control
Programmable puddle build and crater fill functions
Memory retention saves travel settings after powering off
Built-in Limit Switches stop tractor travel and welding when activated
Climbs vertically with a 25 lb. (11.5 kg) pulling capacity
Performs continuous and intermittent welds with programmable weld and skip lengths
Drive wheels rated up to 400°F (204°C)

Technical Specifications

Part Numbers:

KBUG-4000 (120VAC)
KBUG-4002 (240VAC)
KBUG-4004 (42VAC)

Power:

120VAC / 50–60Hz / 1Ph
240VAC / 50–60Hz / 1Ph
42VAC / 50–60Hz / 1Ph

Net Weight: 17 lbs. (7.5 kg)

Shipping Weight: 26.2 lbs. (12 kg)

Shipping Dimensions: 20″ x 19″ x 15″ (508 x 482.6 x 381 mm)

Pulling Power: 25 lbs. (11.5 kg)

Torch Holder: Fits barrels up to 0.75 in (19 mm) dia.

Travel Speed: 0.3–77 ipm (0.76–195.6 cm/min)

Z and Y Stroke: 1.25″ (32 mm)

Welding Position: Flat “down hand” position

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Benefits of the K-BUG 4000

The horizontal fillet welder increases productivity and weld consistency while reducing manual strain on the operator. Its digital control system ensures a constant travel speed, resulting in uniform welds and improved penetration with fewer defects.

Operators can rely on the machine’s accuracy and repeatability to maintain weld quality, even on long seams or challenging wall profiles. This not only enhances precision but also helps cut production time and material waste—delivering a strong return on investment.

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Accessories:

Cable Anchor (KBUG-4040) – Now included as standard
Magwheel Add-On Kit (KBUG-1067) – Used for welding curved irregular shapes
Magsquare (MSQ-165) – The Magsquare is used to activate the limit switch to stop machine travel and welding process.

K-BUG 4000 Brochure

K-BUG 4000 Manual