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Key Points for Robotic Seam Welding of Automobile Fuel Tanks
Aug 13,2026
Automobile fuel tanks are core safety sealing components. Robotic roller seam welding delivers more precise trajectories, stable pressure and consistent finished quality compared with manual welding. However, deviations in raw materials, fixtures, machine tools or roller conditions easily trigger weld leakage, cold joints, burn-through and workpiece deformation.
I Pre-Workpiece Raw Material Inspection
1.Uniform overlapping gaps of tank plates; no oversized gaps, misalignment or height difference. Excessive gaps lead to arcing and air leakage; narrow gaps or misalignment cause material buildup and burn-through with sunken welds.
2.Welding zone free of oil, dust, oxide and coating debris. Surface contamination creates micro-pores and hidden cold joints, resulting in air tight test leakage.
3.Flat tank flanging without warpage, wavy edges or local bulges. Deformed sheets prevent full roller contact, causing segmented incomplete welding and missing welds.
II Fixture & Positioning Requirements
1.Inspect positioning blocks, pressing parts and support pads daily before startup. Eliminate loosening/offset from long-term vibration to prevent trajectory drift and partial missing welds.
2.Keep full contact with weld lines without local suspension or over-clamping, to avoid thin tank denting & deformation while guaranteeing tight welding.
3.Pre-adjust robot path to avoid collision with fixtures/protrusions, preventing roller jamming, offset trajectories and heat-induced burn-through.
III Robot Trajectory & Welding Process Key Points
1.Preheat slowly at start, extend pressure hold & cooling at end to eliminate micro-pores, microcracks and leakage risks at weld ends.
2.Automatically reduce speed & stabilize pressure at arcs & corners of tanks; too fast leads incomplete fusion, too slow accumulates heat and burn-through, ensuring continuous dense curved welds.
3.Keep rollers centered on overlapping weld lines without skew. Calibrate robot origin regularly to avoid unilateral cold joints and uneven indentation from long-term mechanical drift.
4.Maintain smooth robot travel without speed fluctuation to prevent instant heat buildup burn-through or insufficient heat cold joints.
IV Daily Roller Maintenance
1.Flat, smooth roller end faces free of wear grooves, buildup bumps or irregular deformation. Clean & grind rollers regularly to eliminate periodic pore & indent defects.
2.Continuous production heats rollers; inspect water cooling system daily to guarantee normal water flow & temperature, unclog pipelines. Avoid high-temperature material adhesion & mass defects.
V Welding Parameter Matching Rules
1.Insufficient pressure fails full compaction, causing arcing & leakage; excessive pressure squeezes plates to create sunken welds & tank deformation. Maintain stable pressure throughout welding.
2.Constant travel speed matched with corresponding heat input; fast speed brings poor fusion, slow speed accumulates heat & deformation.
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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