RSG200 Spool Gun Contact Tips: When to Replace and How to Check
By MIG/TIG/Stick Welders & Plasma Cutters | USA Weld – HTP ... | Published: 2026-11-02
Category: Tips & Care
Diagnose worn RSG200 spool gun contact tips by symptom: porosity, erratic arc, birdnesting, or a deformed bore. Learn when cleaning helps and when to replace.
Quick answer
Replace the contact tip when the wire no longer passes through the bore with light drag, when the tip bore is visibly ovalized or burred, or when porosity and arc wander persist after you clean the liner and set the right wire diameter. If the wire still feeds smoothly and the arc is stable, clean the tip and keep welding.
Why aluminum spool gun tips wear differently
Aluminum wire is softer and more abrasive than steel wire, and spool guns push it through a short, curved path. The contact tip bore takes the brunt of that drag. A tip that still looks round can already be worn enough to cause erratic contact, because the bore enlarges gradually rather than failing all at once.
That is why symptom-based diagnosis beats a fixed replacement schedule. The same tip may last different amounts of time depending on wire diameter, feed tension, and how often the gun is used.
When cleaning is enough and when it is not
Light spatter on the tip face and a slightly dirty bore often respond to cleaning. If the wire feeds smoothly after cleaning and the arc stabilizes, you have solved the problem without replacing the tip.
Replacement is the better choice when the bore is deformed, when the tip has been cleaned repeatedly and symptoms return quickly, or when a new tip immediately restores stable feeding. Continuing to clean a worn tip only delays the same diagnosis.
Symptom-to-cause diagnosis for RSG200 spool gun tips
- Porosity in the weld bead: Check that the tip bore matches the wire diameter and that the tip is fully seated. If the bore is worn oversize, shielding gas can escape around the wire instead of reaching the puddle. Replace the tip if porosity continues after you confirm the gas flow and wire diameter. Confirm wire diameter before replacing; a mismatched tip can mimic wear.
- Erratic arc or wandering puddle: Inspect the tip bore for ovalization or burrs. A worn bore changes electrical contact and makes the arc unstable. If cleaning does not restore a steady arc, replace the tip.
- Wire birdnesting at the gun: A partially clogged or deformed tip bore increases drag and can cause the wire to buckle. Clear the tip and check the feed path. If birdnesting repeats with a clean tip, replace the tip before adjusting feed tension. Repeated birdnesting with a clean tip points to bore wear, not tension.
- Wire feeds but drags noticeably: With the gun disconnected from power, feed a short length of wire through the tip by hand. Light drag is normal; a gritty or tight feel means the bore is worn or contaminated. Clean once, then replace if the drag returns.
- Tip face heavily spattered: Clean the face and bore. If spatter returns immediately and the arc is otherwise stable, improve your nozzle cleaning routine rather than replacing the tip. Replace only if the bore is also worn.
- Stop point: repeated replacement in a short period: If a new tip fixes the problem but the same symptom returns within a few inches of weld, stop replacing tips and check wire diameter, feed tension, liner condition, and gas flow. The tip is then a symptom, not the cause. Repeated tip failure is a signal to inspect the whole feed path.
Product facts
- Contact Tip, 10-Pack, for RSG200/RSG200-MIL Spool Guns: 10-pack of contact tips for RSG200 and RSG200-MIL spool guns with an M5 thread, available in .023", .030", and .035" wire diameter options. Matching the tip to your actual wire diameter is the first check before you blame the tip for feed or arc problems.
Contact Tip, 10-Pack, for RSG200/RSG200-MIL Spool Guns
