MIG Wire Fusing to the Contact Tip? Stop Burnback With a Fitment-First Fix

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What This Fix Solves

• • Wire fuses to the contact tip at the end of a weld or on restart
• • Arc starts get violent or inconsistent
• • You keep changing tips but the failure repeats
• • Feeding feels “surged” (slip then catch) right before burnback

Root Cause Breakdown (Why Burnback Happens)

Burnback is the wire melting back into the contact tip. That happens when the wire stops moving forward (or slows down) but the arc keeps heating the wire at the tip. The common causes are:

1. Wrong tip size: tip bore too tight for the wire diameter (or wrong system) increases friction and heat.
2. Worn/oval tip: poor current transfer and micro-arcing can overheat the wire at the tip.
3. Stickout too short: excessive heat at the tip area (especially on hot starts) increases burnback risk.
4. Feed instability: wrong drive rolls, wrong tension, liner drag, or spool brake issues cause the wire to stop while welding.
5. Front-end mismatch: mixing tip/nozzle/diffuser styles that do not seat correctly can create resistance and heat.

The Fix (Actionable Steps)

1. Confirm wire diameter on the spool label: .030 vs .035 vs .045 is the first check.
2. Match the contact tip to the wire size AND system: AccuLock S tips are not interchangeable with standard threaded tips.
3. Replace the tip (do not “clean it”): once the bore is damaged or spattered, it becomes a repeat failure point.
4. Set drive roll tension correctly: start low and increase only until it feeds without slipping.
5. Inspect liner drag: if you have to crank tension to feed, fix the liner/roll fitment instead.
6. Verify stickout and technique: avoid burying the tip into the puddle; keep a consistent stickout for your process.

Key Specs / Fitment Notes

• • Product: Bernard AccuLock S Contact Tip .035 (TA035CH)
• • Wire size: .035" (from product name)
• • System: AccuLock S (from product name)

Before You Order Checklist

Recommended Accessories (Priority Order)

Comparison Block (Alternatives)

• AccuLock S tips (featured): designed for the AccuLock S consumable system (verify your gun family).
• Standard threaded tips: common on many guns, but not interchangeable with AccuLock S.
• Oversize tips: sometimes used for aluminum or specific setups; can reduce current transfer if misapplied.

Safety Note

Power down the feeder before opening the drive system or changing consumables. Keep hands clear of pinch points. Do not bypass safety devices.