What are the cooling water quality requirements for intermediate frequency spot welding machines?

What are the cooling water quality requirements for intermediate frequency spot welding machines? Generally, the content of sulfate ions, silicate ions and phosphate ions in groundwater and surface water is low, while the content of bicarbonate ions is high. Therefore, the scale produced in the circulating cooling water system is mainly carbonate of calcium and magnesium. In addition, there are also small amounts of sulfate, silicate and phosphate of calcium and magnesium.

Because the heat transfer coefficient of the conductive circuit of the medium frequency spot welding machine is related to the surface area scale, the thicker the surface scale, the smaller the heat transfer coefficient. Usually the scale thickness cannot exceed 2 mm. The nature and temperature of the cooling water directly affect the growth of the scale thickness. , so you must choose to use clean, debris-free, neutral and soft water for spot welding.

For machine cooler, the specific provisions are as follows:

1. The cooling water is close to neutral, that is, the hydrogen ion concentration P value is 6.5-9.5;

2. Organic matter and suspended mechanical impurities are both ≤25 mg/L, and oil content is ≤5 mg/L.

3. Hardness ≤10° (hardness 1° is equivalent to 10 mg Ca0 or 7.19 mg Mg0 in 1 liter of water).

4. Rectification plan Calcium ions in water are the main reason for the formation of calcium carbonate. If calcium and magnesium ions can be removed from the water to soften the water, calcium carbonate will not crystallize and precipitate, and scale will not form.

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