Test Method of Tungsten Contacts in Cut-out

Weld strength is measured according to the regulations in JB / T 9864.2 ------ 1999.

Check and measurement of tungsten contacts is available by using universal measuring tool.

Tungsten contacts appearance and weld can be checked with a magnifying glass or by visual inspection.

Determination of the number of sections of crystal grains according to GB / T 4197 requirements.

The roughness of contact surface of tungsten contacts can be measured with surface roughness measuring instrument.

Purity of tungsten sheet is measuring according to GB / T 4324.1-4324.30 requirements.

Hardness measurements according to GB / T 230 rules: If the Vickers hardness measurement method is adopted, the load should be 4.904N, according to GB / T 4340 requirements. The conversion of measured values can refer to the relevant tables; the measurement results should be consistent with the provisions of the HRA.

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