Protection follows the failure path.
A spot-welding route starts with where sparks land, how the gun changes and who has to inspect the result.
Start with the spatter path, not a barrel part number
Spot welding creates an outer-surface problem. Before selecting a barrel or a cloth cover, map where sparks and slag actually land, which axes carry the most heat and how the gun or changer moves.
A protective structure that blocks the service window is not a solution. Check the full tool-change cycle, the inspection route and the moving mass, then decide whether the barrel is the right starting point.
Series 4 is a protection-led starting point, while Series 3 and Series 5 can address stroke or compact-storage needs in the same route. The combination still needs one envelope and one service review.
The short version.
- Map the spatter path.
- Check the tool-change cycle.
- Keep the service window open.
- Review added mass and access.
Before this becomes a project.
Should every spot-welding project use Series 4?
No. Series 4 is a starting point when spatter and impact dominate. The route also depends on stroke, space, tool and service access.
Can another series be combined?
Yes. A barrel, spring or telescopic element can be combined when the duty has more than one motion or protection problem.
Keep asking questions.
Bring the robot, the tool and the motion.
We will turn the note into the questions that actually block your drawing.