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In Cylinder-Body Seam Welding of the Car Shock Absorber on the Shock-Absorber Seam-Welding Machine, What Are Generally the Causes of Intermittent Cold Joints in the Weld Seam?
Oct 26,2026
The shock-absorber seam-welding machine relies on the roller continuous pressurization and continuous energization to form a continuous fused weld seam at the cylinder-body joint. Intermittent cold joints appear as one section of the weld seam fusing well and another section not penetrating, with fusion failure appearing in segments.
I Roller Electrode Factors
1.The roller surface is worn, with grooves, or with adhered welding slag and oxidation impurities; when rolling, contact with the cylinder body is unstable, conduction is intermittent, forming intermittent cold joints.
2.The upper and lower rollers have centering offset, and the pressure on the two sides of the weld seam is uneven.
3.The roller cooling is poor, the roller surface oxidation increases after continuous temperature rise, conductive ability is unstable, causing segmented poor bonding of the weld seam.
II Unstable Welding Pressure
1.Pneumatic pressure fluctuation, cylinder jamming, the pressure varies during roller welding, positions with insufficient pressure have poor sheet fitting, producing cold-joint sections.
2.Roller bearing jamming, tooling support-roller wear, the gap between the roller and the cylinder body changes constantly, causing intermittent cold joints in the weld seam.
III Improper Matching of Welding Current and Welding Speed
1.Unstable power output, or loose conductive-loop joints, insufficient heat supply.
2.Tooling rotation speed fluctuation, the weld seam receives unstable heat, and areas with insufficient heat form cold joints.
3.Unreasonable current timing settings, energization gaps appear, and local fusion fails.
IV Effect of Cylinder-Body Incoming Material and Joint Condition
1.Residual oil and oxide scale on the cylinder-body surface block metal fusion.
2.Poor cylinder-body roundness, with deformation, positions with excessive gaps cannot be pressed and fused.
3.The cylinder-body lap edges are uneven, with edge mismatch, the joint fitting is unstable, and poor fusion appears intermittently.
V Tooling Positioning Problems
1.The cylinder-body positioning is unstable, and the roller contact gap is unstable.
2.The tooling rotation speed is unstable, each position of the weld seam is heated unevenly, and fusion fails at intermittent positions.
VI On-Site Improvement and Control Key Points
1.Regularly inspect the roller, clean surface welding slag and oxide layer in time, grind worn and grooved rollers in time, and correct roller centering.
2.Check the pneumatic system, eliminate air leakage and pressure-fluctuation faults, and ensure stable pressure throughout roller welding.
3.Clean oil and oxide scale in the cylinder-body welding area before welding.
4.Regularly tighten conductive-loop joints, check the condition of conductive parts, and stabilize welding current output.
Wuxi Haifei Intelligent Equipment Co., Ltd. https://www.haifeiwelder.com/
Wuxi Haifei Intelligent Equipment Co., Ltd. has focused on the R&D and production of automated equipment for 17 years. The company has obtained ISO9001 quality management system certification, national 3C certification and CE certification. It is a National High-tech Enterprise, a Specialized, Refined, Differential and Innovative Enterprise of Jiangsu Province, a Specialized, Refined, Differential and Innovative Enterprise of Wuxi City, and a Gazelle Enterprise in Southern Jiangsu National Independent Innovation Demonstration Zone. Should you be interested in our automated equipment, please contact us: 400-0510-750.
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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