One welding cobot may serve several part sizes, but the usable range needs to be defined by complete applications rather than overall dimensions alone. The largest part can limit reach and handling; the smallest can create the tighter tool-access problem.
In this Article
- Describe the real size range
- Match arm capability and presentation
- Build a size-range comparison
- Do not confuse workpiece mass with arm payload
- Define what changes within the range
Describe the real size range
List representative dimensions and explain how each assembly is loaded and presented. Include the relevant torch approaches rather than reducing the requirement to overall length and width.
Also identify how often each size runs. An occasional oversized fabrication should not silently become the design basis for a cell intended primarily for smaller recurring work. Make that tradeoff explicit.
Match arm capability and presentation
Kassow's robot range has model-specific reach and payload ratings. Those specifications need to be considered with the welding package and proposed arrangement; seven axes alone do not define the working size limit.
For a larger assembly, evaluate the farthest required seam and the path between joints. For a smaller one, consider whether the presentation keeps the work accessible and practical to load. Each end of the range deserves an application review.
Build a size-range comparison
- Small crowded assembly
- Likely limiting question: Can the tool enter and orient correctly?
- What to demonstrate: The most enclosed required seam
- Typical repeat assembly
- Likely limiting question: Does the arrangement serve the main workload?
- What to demonstrate: Complete coverage and handling route
- Large supported frame
- Likely limiting question: Can all intended poses be reached practically?
- What to demonstrate: The far and near approaches with realistic presentation
This is a conceptual comparison, not a ranking by size. Some large parts have open, simple access; some small parts are difficult because neighboring features leave little room.
Do not confuse workpiece mass with arm payload
When the assembly is supported by a table or fixture, the welding robot does not carry its entire mass. The arm's payload review concerns its carried tool package and the relevant load characteristics. Workpiece support and any part-positioning equipment have separate requirements.
That distinction prevents both oversizing an arm because the fabrication is heavy and understating the support requirements because the robot is only carrying a torch. The complete arrangement needs both checks.
Define what changes within the range
Different sizes can need separate programs, locating arrangements, and review of the welding process. Even when a family shares a general method, it does not follow that one unmodified setup handles every member.
Choose the principal workload first and assess other sizes as defined additions. If a rarely produced large assembly drives a substantially different cell concept, compare whether it belongs in the first scope at all. Seven-axis articulation adds motion options, not an unlimited part-size envelope.
Related Reading
- Welding Automation System Requirements: What to Gather Before an Application Review
- Cobot Welding Part Families: How Job Shops Can Find More Than One Good Application
Discuss Your Welding Application
Works Cited
Kassow Robots. "7 Axis Collaborative Robot Arm: KR Series." Kassow Robots, https://www.kassowrobots.com/products/7-axis-collaborative-robot-arm-kr-series. Accessed 14 Sept. 2026.