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UseResistance welding machineDuring welding, the surface of the workpiece must be kept clean. If rust, oil stains and other dirt are not cleaned, it will produce great resistance, so thatDefects such as incomplete welding and weak welding.
Resistance generally refers to contact resistance, which is an additional resistance, such as the contact surface between the workpiece and the workpiece, the contact surface between the workpiece and the electrode, and the resistance value between them.
Take the 3mm thick low carbon steel plate electrode pressure, F= 2000N test temperature, 20C as an example to see how big the difference in resistance value is between cleaning and not cleaning. 1. After pickling 300 μΩ 2. 100 μΩ after grinding with emery wheel 3. After grinding and cleaning the emery wheel, apply oil and store it at 300 μΩ. 4. The emery wheel becomes rusty after being polished and cleaned. 80000 μΩ 5. Surface with iron oxide scale 80000 μΩ 6. Re-rust on the surface with oxide scale 500000 μΩ 7. Surface after cutting: 1200μΩ 8. Surface after file processing: 280μΩ 9. Surface after grinding: 110μΩ
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