- Scope of application:
It is suitable for the continuity test of checking the paint film of enameled round wire with a nominal diameter of 0.070mm and above and 0.700mm and below.
- According to the standard:
G
- Test equipment:
Salt water pinhole tester.
- Test specifications:
4.1. Salt water preparation:
Use purified water (or boiled water) to make a saline solution with a concentration of about 0.2%, and add an appropriate amount of 3% phenolphthalein alcohol solution dropwise
The indicator, the dosage can be combined with the test, and it is replaced regularly.
4.2. Unbent saline pinhole:
4.2.1. Take a sample with a length of 6000+50mm and immerse it in the specified salt without being subjected to any stretching and deliberate bending.
in aqueous solution.
4.2.2. The solution is connected to the conductor of the positive electrode sample is connected to the negative electrode, and a DC voltage of 12V is applied.
4.2.3. Put the wire end into the water to confirm that the connection is good, that is, if the wire end appears red, it means the connection is good.
4.2.4. Check the number of pinholes produced by the sample within 1min of pressurization (a red line is a pinhole)
4.2.5. Record the number of pinholes in the corresponding sample. (If the number of pinholes cannot be counted, the test is considered invalid, and the saline solution should be replaced and the dripping should be reduced.
The amount of indicator, re-test)
4.3. Bend the saline pinhole first: (bend before immersing in saline)
4.3.1. The sample is wound into a coil with a diameter of 128mm (15 turns is sufficient), the coil is folded in half at four symmetrical points, and then flattened.
Into a 100 × 100mm square. Immerse in the prescribed saline solution.
4.3.2. The solution is connected to the positive electrode, the conductor of the sample is connected to the negative electrode, and a 12V DC voltage is applied.
4.3.3. Put the wire end into the water to confirm that the connection is good, that is, if the wire end appears red, it means the connection is good.
4.3.4. Check the number of pinholes generated at the bending of the sample within 1min of pressurization (a red line is a pinhole”
4.3.5. Record the number of pinholes corresponding to the bend of the specimen. (If the number of pinholes cannot be counted, the test is considered invalid.
Add less amount of indicator and re-test
4.4. Post-bend saline pinhole: (bend after applying voltage)
4.4.1. The sample is wound into a coil with a diameter of 128mm (15 turns is sufficient), and immersed in the specified saline solution.
4.4.2. The solution is connected to the conductor of the positive electrode sample to the negative electrode, and a DC voltage of 12V is applied.
4.4.3. Put the cable end into the water to confirm that the connection is good, that is, the red color on the cable end indicates that the connection is good.
4.4.4. In saline solution, fold the coil in half at four symmetrical points, then flatten to form a 100×100mm square. Make
The wire is completely submerged in salt water.
4.4.5. Check the number of pinholes generated at the bend of the sample within 1min of pressing. (A red line is a pinhole)
4.4.6. Record the number of pinholes at the bend of the corresponding sample. (If the number of pinholes cannot be counted, the test is considered invalid.
Reduce the amount of Dizhen indicator and re-test)
- Test results and calculations:
Record the number of pinholes as the test result.
