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Causes & Countermeasures of Spark Bursting Triggered by Oil & Rust on Workpieces for Medium Frequency Spot Welders
Jul 08,2026
Spark bursting (violent instant sparks, splashing molten metal, harsh noise, sheet burn-through and electrode damage) is a frequent abnormal fault in medium frequency spot welding. Oil contamination and rust on workpiece surfaces are the primary triggers. Detailed analysis and solutions below.
I. How Oil Causes Spark Bursting
1.Oil vaporizes under heat to form high-pressure gas, bursting the molten weld pool instantly and generating sparks.
2.Oil combustion amplifies localized overheating, aggravating metal splashing and spark burst.
3.Oil film separates contact surfaces, creating uneven current distribution and localized overheating.
II. How Rust Causes Spark Bursting
1.Rust layers carry ultra-high resistance; massive heat accumulates when current passes through, triggering intense sparks.
2.Rust peels off under high temperature, destabilizing the weld pool and causing molten metal splashes.
3.Rust creates poor contact, fluctuating current and abnormal heat transfer.
III. Prevention & Solutions
1.Pre-welding cleaning: fully remove oil and rust to eliminate gaps and heat transfer barriers.
2.Parameter optimization: adopt matched current and duration to avoid surface overheating while guaranteeing inner heat supply.
3.Standard operation: keep electrodes vertical to welding points for uniform heat conduction.
4.Emergency handling: shut down power immediately upon spark burst, clean electrodes and workpieces then readjust parameters before restarting.
5.Routine maintenance: inspect electrodes and cooling systems regularly to avoid heat accumulation.
IV. Emergency Response Flow
Once spark burst occurs:
1.Power off and wait for equipment cooling.
2.Clear splashes, residual oil and rust on welding zone.
3.Inspect electrode adhesion and workpiece burn-through.
4.Verify surface cleanliness, electrode condition and welding parameters; re-clean workpieces / grind electrodes / modify parameters if needed.
5.Conduct trial welding; resume mass production only after zero spark burst and well-formed nuggets are confirmed.
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Wuxi HAIFEI Intelligent Equipment Co., Ltd.
Wuxi HAIFEI Welding Equipment Co., Ltd.
Add: 28 Shuiyun Road, Yuecheng, Jiangyin, Jiangsu Province, China. (Postal Code: 214404)
Mobile: +86 18915302352
Email: wushijie@jshaifei.com