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What Effects Do Oxidation and Oil Contamination on Workpiece Surfaces Have on Weld Spots in Silver-Point Spot Welding with Medium-Frequency Spot-Welder?

Sep 29,2026

Silver-point spot welding with a medium-frequency spot-welder welds silver contacts onto a copper base material, and is mostly used for electrical components such as relays and switches. Both silver and copper surfaces easily oxidize and easily pick up oil contamination. Surface contaminants change the welding-interface state and trigger various weld-spot defects.

I Silver-Point Spot Welding Is Sensitive to Surface Condition

1.Welding heat generation relies on contact resistance; oxide films and oil change the contact resistance value, causing abnormal heat generation.

2.Fluctuations in workpiece surface cleanliness cause uneven weld-spot quality under the same set of welding parameters.

3.Silver points and workpieces exposed to air slowly oxidize; the longer the storage and transfer time, the greater the influence of oxidation.

4.Oil contamination is highly covert and easily overlooked.

II Various Effects of Surface Oxidation and Oil Contamination on Weld Spots

1.Cold joints and point detachment, insufficient weld-spot strength

2.Pores and inclusion defects inside weld spots

3.Spatter, weld-spot blackening, and poor appearance

4.Deteriorated conductivity and easy heating during use

5.Accelerated electrode wear and increased maintenance costs

6.Unstable batch quality and poor consistency

III Prevention and Control Solutions for Surface Oxidation and Oil Contamination

1.Do good surface cleaning before welding

2.Workpiece storage and protection

3.Process parameter and electrode control

4.Production-process inspection and control

Wuxi Haifei Intelligent Equipment Co., Ltd. https://www.haifeiwelder.com/

Wuxi Haifei Intelligent Equipment Co., Ltd. has been focusing on the R&D and production of spot‑welding machines for 17 years. The company has obtained ISO9001 Quality Management System Certification, China Compulsory Certification (3C) 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, and a Gazelle Enterprise in the Southern Jiangsu National Self‑Dependent Innovation Demonstration Zone.

Should you be interested in our spot‑welding machines, please contact us: 400‑0510‑750.

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