After the finished product operator brings all produced copper wire to the packaging table, quality inspection must bring UL1095. UL1007. and UL1015 electronic wire to the packaging table for rigorous quality inspection. Specific inspection standards must be strictly followed in accordance with the following procedures:

Ⅰ. Appearance Inspection

1) Smooth surface, free of black lines, stray wires, pitting, oxidation, nicks, scratches, dents, poor tinning (sticky or leaking), slanted lines, hand joints, or fingerprints.

2) UL2651 gray wire must be smooth and uniform, with no heaping, missing edges (one side high, one side low, or two sides high, two sides low), or strands.

3) The tension should be moderate, not too loose or too tight.

4) There should be no dust on the copper wire surface after rolling (overfilling).

II. Wire Diameter Inspection

1) First, check that the micrometer is zeroed.

2) Place the copper wire to be inspected outside the micrometer's clamping clip and twist the end of the micrometer with appropriate force (not too much or too little).

3) Observe the reading after hearing three beeps on the micrometer.

4) Repeat this inspection two or three times until the readings are consistent (for the same copper wire). Do not inspect the same location each time; inspect sections separately.

5) For copper wires with a diameter of 0.2 cm or more, inspect the different interfaces of the wire to avoid flattening.

III. Elongation Test

1) Turn on the elongation tester.

2) Check that the left clamp is in its original position and that the instrument reading has returned to zero. If the left sensing clamp is not in its original position and the instrument reading does not return to zero, immediately press the Reset and Zero keys.

3) Gently open the clamps. Place one end of the copper wire to be tested into the sensing clamp. Press the clamp down. Gently straighten the wire and place the other end into the other sensing clamp. Press the clamp down to secure the wire, and press the Test key.

4) After the sensing clamp breaks the wire and stops moving, observe the reading on the display. This is the elongation of the copper wire being tested.

IV. Resistivity Test

1) Turn on the resistivity tester.

2) Clamp the two inductive clamps together and observe whether the reading is zero.

3) If the instrument displays a reading of 0. take a 1m section of the copper wire to be tested and clamp each end of the wire with the two inductive clamps. The copper wire to be tested must not come into contact with any metal objects. Press the test button.

4) Observe the displayed reading and calculate the resistivity using the following method:

Resistivity = Reading ** 0.7854 * Room Temperature Conversion Factor / 1000

V.  Stamp the QC stamp on qualified products

Round Copper Wire Models:

TR - Soft Round Copper Wire

TY - Hard Round Copper Wire

TXR - Tinned Soft Round Copper Wire

TYT - Extra Hard Round Copper Wire