Standard for inspection of bare copper wire for tinned wire

After the finished product operator pulls all the produced copper wire to the packaging table, the quality inspection shall take the UL1095 electronic wire, UL1007 electronic wire, UL1015 electronic wire copper wire to the packaging table for strict inspection of its quality, the specific inspection standard shall be strictly carried out in accordance with the following steps:

1. Appearance inspection: Place the SPL filled with UL1007 electronic wire copper wire on the floor packaging table, hold a piece of white paper in one hand and put it at a position 1-2cm away from the copper wire, roll the SPL of UL1015 electronic wire copper wire for a week with the other hand, and visually test whether its appearance meets the following standards:

1) Smooth surface, no black line, no messy line, no pitting, no oxidation, no scratching, no bad tin plating (sticky tin, tin leakage), no oblique line, no hand joint, no hand mark.

2) UL2651 gray line is good, uniform, no pile edge, underedge (side high side low or two sides high side low), no strands.

3) The tension is moderate but loose or too tight.

4) No sticky ash phenomenon on the surface of the copper wire after rolling (too full)

Second, wire diameter inspection: wire diameter should be in accordance with national general standards, customers have special requirements according to their requirements strictly controlled. The specific inspection steps are as follows:

1), first debug whether the micrometer is zero.

2), the copper wire to be tested is placed outside the clip of the micrometer, and the end of the micrometer is twisted with appropriate force (the force cannot be too heavy or too light).

3), when you hear the micrometer ringing three times, you can observe its reading.

4), should be so repeatedly tested two, three times the reading can be consistent (the same copper wire) each time can not detect the same position, should be segmented inspection.

5), the wire diameter of more than 0.2cm copper wire to check the different interfaces of copper wire, so as to avoid flat wire.

Third, elongation test: elongation is required in accordance with national standards, customers have special requirements in accordance with their requirements strict control, the specific steps are as follows:

1) Open the switch of the elongation tester.

2) Observe whether the left clamp is in the original position and whether the reading shown by the instrument is zero. If the left sensor clamp is not in the original position and the reading shown by the instrument is not zero, press the recovery key and set the zero key immediately.

3) Gently open the clip, put one end of the copper wire to be tested into the induction clip, press down the induction clip, then gently straighten the copper wire and put the other end into another induction clip, press down the induction clip to clamp the copper wire firmly, press the test key.

4) After the copper wire is pulled off and stopped moving by the induction clip, the reading displayed by it is the elongation of the detected copper wire.

Four, resistivity test: resistivity requirements according to the national standard specific test steps are as follows:

1) Turn on the power switch of the resistivity tester.

2) Clamp the inductive clamp pair on both sides and observe whether the reading is zero.

3) If the reading shown by the instrument is 0, take a 1m long section of the copper wire to be tested and clamp the two ends of the copper wire respectively with two induction clips. The detected copper wire shall not be in contact with any metal items, and press the test key.

4) Observe the reading displayed, and take the reading to calculate the resistivity, the calculation method is as follows:

Resistivity = Reading **0.7854* Room temperature change coefficient /1000

5. After the inspection is completed according to the above steps, the qualified ones shall be stamped with QC seal.

Round copper wire model:

TR----- soft round copper cable TY----- hard round copper cable

TXR----- tin-plated soft round copper wire TYT----- extra hard round copper wire