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Why Water Cooling Is Required for Medium Frequency Seam Welding of Bellows
Jul 23,2026
Bellows are mostly made of thin-walled stainless steel, lightweight with low rigidity, prone to thermal distortion. They are widely used for sealing, expansion joints and pressure pipelines. Skipping insufficient water cooling during seam welding leads to mass rejects such as burn-through, crack leakage and wheel adhesion.
1 Prevent Burn-Through & Collapse of Bellows
Thin bellows walls store little heat and are extremely heat-sensitive. Continuous welding accumulates concentrated heat without water cooling, softening the metal to cause collapse, out-of-round deformation and loss of elasticity, even pinhole burn-through scrapping. Circulating water quickly removes residual heat to fix weld shapes and preserve original dimensional elasticity.
2 Avoid Weld Embrittlement & Post-Work Leakage
Bellows operate under pressure, vibration and cyclic expansion, requiring ductile welds. Prolonged high-temperature exposure embrittles stainless steel and generates invisible microcracks that expand during service to cause gas/liquid leakage. Water cooling accelerates cooling, refines grain structure, improves weld compactness and ductility to extend service life.
3 Reduce Oxidation & Preserve Corrosion Resistance
High heat yellows, blues or blackens weld zones, destroying stainless steel anti-corrosion performance. Continuous water cooling shortens high-temperature exposure time, minimizing oxidation discoloration for bright welds and intact rust resistance.
4 Stop Wheel Adhesion & Stabilize Weld Quality
Molten stainless steel easily adheres to hot wheels to form hard nodules, causing scratches, periodic arcing and missing welds with frequent downtime for grinding. Water cooling keeps wheels at low constant hardness, drastically reducing adhesion, grooving and wear, delivering consistent smooth welds and less downtime.
5 Eliminate Thermal Drift for Batch Consistency
Continuous operation heats wheels and conductive components, raising circuit resistance and weakening welding heat. Cold machine produces sound welds while long runs trigger cold joints and incomplete fusion. Water cooling stabilizes overall equipment temperature, maintaining identical heat input for every seam and consistent batch quality.
6 Protect Core Components & Extend Equipment Lifespan
Heavy current heats internal electrical and conductive parts continuously. Without water cooling, overloading accelerates aging, unstable output and overheat alarms, even permanent component damage. The cooling system cools wheels and key parts simultaneously for long uninterrupted stable production and longer machine service life.
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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