8kg Payload 2101mm Long Reach Arc Welding Robot Arm for Large Structural Weldments

8kg Payload 2101mm Long Reach Arc Welding Robot Arm for Large Structural Weldments

This 8kg payload 2101mm long reach arc welding robot arm is the extended-reach member of the KR 8 arc HW family, built for long structural weldments that a 1441 mm arm cannot cover in one setup. A 2101 mm maximum reach with an 8 kg rated payload and 0.04 mm pose repeatability lets the torch run a full rail, beam or frame seam without indexing the workpiece.

The arm body is sealed to IP65, which is a step above the usual IP54 in this class and suits fabrication shops where grinding dust and spatter reach the whole arm, not just the wrist. The hollow wrist keeps torch, wire conduit and shielding gas inside the arm to the wrist centre, so the cable package stays clear over the long travel path.

Axis speeds of 200, 175 and 190 degrees per second on the main axes and 430, 430 and 630 degrees per second on the wrist are matched to a 260 kg structure carrying a long torch, producing stable travel instead of snap motion. Floor, ceiling, wall and any-angle mounting are supported, so the arm can hang over a fixture from a gantry and leave the shop aisle clear.

In a structural fabrication cell this arc welding robot arm typically works with a head and tail stock positioner or a turntable, and the 2101 mm reach allows several passes along a seam before the workpiece turns. Because the hollow wrist holds the torch angle over that distance, the arc welding robot arm keeps penetration consistent on thick plate, and the IP65 arm rating means the arc welding robot arm can be mounted low, close to the spatter zone, without extra guarding.

Key Specifications

Advantages of This Arc Welding Robot Arm

• 2101mm reach: completes long seams on rails, beams and frames from one base position instead of two fixture setups.
• IP65 arm protection: full arm sealing against grinding dust and spatter, not only at the wrist, for harsh fabrication shops.
• 8kg payload at long reach: carries a water-cooled torch, collision sensor and air blast with margin for wire feeder hardware.
• Hollow wrist torch routing: cable package stays inside the arm across long travel, reducing wear and snagging.
• 0.04mm pose repeatability: holds the torch on the seam at full extension, protecting penetration on thick sections.
• Tuned axis dynamics: 200, 175 and 190 degrees per second main axis speeds keep a 260 kg arm stable with a long torch.
• Any-angle mounting: floor, ceiling, wall and inclined installation suit gantries and large fixture shops.
• ESD compliance: IEC 61340-5-1 and ANSI/ESD S20.20 requirements met for mixed fabrication and electronics work.

Applications

• Structural steel welding of beams, columns and trusses
• Chassis, trailer and agricultural frame welding
• Tank, silo and vessel shell seam welding
• Long weldments that would otherwise need two fixture indexes
• Gantry and ceiling mounted welding over large fixtures
• Multi-pass GMAW on thick plate with weave patterns
• Construction machinery and attachment fabrication
• Job shop welding with frequently changing part lengths

FAQ

Q: When should I choose the 2101mm arm instead of the 1441mm version?

A: When a single setup must cover a long seam. The 2101 mm arc welding robot arm reaches across chassis rails, beams and tank shells that would need two fixture indexes with the 1441 mm model, and it leaves more clearance around positioners at the end of the weld.

Q: Does the longer reach change the payload?

A: Rated payload stays at 8 kg, but maximum payload drops to 9.3 kg instead of 11.3 kg because a longer arm has less margin at extreme centre of mass offsets. Torch packages should be checked with KUKA Load before ordering.

Q: Why is the arm rated IP65 on this model?

A: Fabrication shops generate grinding dust and spatter across the whole arm, not only at the wrist. IP65 on the arm body means dust-tight sealing and protection against water jets from any direction, which extends service life in that environment.

Q: How does the hollow wrist help over long distances?

A: Torch, wire conduit and gas hose run inside the arm to the wrist centre, so nothing loops or pulls as the arm extends. Wire feeding stays smooth and the torch angle stays consistent, which is what multi-pass work on thick plate needs.

Q: Which controller runs this arc welding robot arm?

A: The KR C5-2 or KR C5 controller. Seam tracking, touch sensing, weave patterns and fieldbus integration are available through KUKA ready-to-use packages, and programs can be prepared offline.

Q: What is the operating temperature range?

A: 5 to 55 degrees Celsius, wider than the compact model because large fabrication halls and gantry installations often run warmer. The controller cabinet should still be placed outside direct radiant heat from the arc.

Q: What are the ordering and delivery details?

A: Minimum order one piece, stock units ship in 3 working days and configured welding cells in 15 to 25 days. FOB or CIF terms, factory calibration report, NRTL, CE and CR documentation, 12 month warranty with remote technical support.

Q: How do I request a quotation?

A: Send your weldment drawing, seam length, wire and gas details, positioner layout and plant voltage. Our engineers confirm reach and payload margin with KUKA Load, propose torch, seam tracking and safety packages, and return a price, lead time and cell layout drawing for this 2101 mm reach arc welding robot arm.