GB/T 33825-2017Steel/copper composite rod and wire for hermetically sealed relay (English PDF)

3.6 Air tightness

The product and test accessories shall be tested after sealing. The leakage rate is not more than 1×10^-4 Pa · cm3/s.

3.7 Appearance quality

Product surface shall be bright and clean, no obvious longitudinal scratches, cracks, peelings, inclusions, pressure pit or other defects, allowing a slight local scratch or straightening roll.

4.1 Chemical composition

The analysis of Ni element with the substrates of 4J29, 4J44, 4J33, 4J34, 4J4 is carried out according to GB/T 223.25. The analysis of Co element is carried out according to GB/T 223.20. The analysis of other element shall be in accordance with GB/T 4336 or the method agreed by the supplier and the purchaser. The chemical composition analysis with the substrate of 30CrMnSiA is carried out according to GB/T 4336. The chemical composition analysis of composite is carried out according to GB/T 5121 (all parts).

4.2 Dimension and its allowable deviation

The outer diameter of the product is measured with a micrometer. The length is measured with a tape measure. And the diameter of the composite is measured according to GB/T 6462.

4.3 Surface roughness

The surface roughness of the product is measured with a roughness meter.

4.4 Composite quality

The finished wire is repeatedly bent until it is broken. And the fracture longitudinal metallographic sample is prepared and observed with a 30x microscope.

4.5 Air tightness

The testing of the product's air tightness is carried out according to the method agreed by the supplier and the purchaser.

4.6 Appearance quality

The appearance of the product is visually inspected.

5.5 Determination of inspection results

5.5.1 If the chemical composition fails, this batch of products shall be rejected.

5.5.2 Should the dimension and its allowable deviation, surface roughness, appearance quality fail, this piece or roll of products shall be rejected.

5.5.3 When the air tightness qualification rate is not greater than 90%, this batch of products shall be rejected.

5.5.4 If a sample of composite quality inspection fails, it shall extract double samples from this batch to repeat the test (including the failed piece or roll in the previous inspection). Only when the retesting results are qualified, this whole batch of products shall be accepted. If there is still one sample in the retesting failing, this whole batch of products shall be rejected.

6.1 Mark

In addition to the inspection mark, the product shall be marked or labeled on each box with.

a) supplier's name;

b) product's designation, dimension and status;

c) product's batch number.

6.2 Packaging

The rods are in single or multiple bundles. The wires are in coils. Wrap in plastic woven cloth or cosmetic paper. Load in a wooden box with plastic film, moisture-proof paper or gas-phase rust-proof paper.

6.3 Transport and storage

During the product's transport, it shall prevent bruises, abrasions. The products shall be kept in a dry, non-corrosive place. […]