2023-12-14
(1) Surface quality inspection ① The surface of the wire should have no scratches, dents, scratches, cracks, protrusions, folds, or other defects that reduce the service life of the device, exceeding 5% of the wire diameter. During the drawing process of gold wire, surface defects appear on the surface of the wire, which can increase the current density and make the damaged area easy to burn. At the same time, the ability to resist mechanical stress is reduced, resulting in the fracture of the damaged inner lead The surface of the gold wire should be free of oil stains, rust, dust, and other adherents, which will reduce the bonding strength between the gold wire and the LED bead chip, as well as between the gold wire and the bracket. (2) With a diameter deviation of 1 gram of gold, a length of 26.37m and a diameter of 50 can be drawn μ M (2 mil) gold wire can also be drawn with a length of 105.49m and a diameter of 25 μ A gold wire of m (1 mil). If the length of the gold wire is fixed, and the diameter of the incoming gold wire is half of the original, then the measured resistance of the gold wire is a normal quarter. According to photoelectric detection, for suppliers, the thinner the diameter of the gold wire, the lower the cost, and the higher the profit while keeping the selling price unchanged. For our company's use of gold wire LED beads, purchasing gold wire with cut corners in diameter poses a risk of increased wire resistance and reduced melting current, greatly reducing the lifespan of LED beads. A lifespan of 1.0 mil of gold wire is inevitably shorter than that of 1.2 mil of gold wire. Analysis of Pure Gold Method for LED Beads Gold Wire (3) Chemical Composition Inspection Method 1: ICP Purity Detection to Identify the Purity Grade of Gold Wire and Determine the Added Alloy Elements. LED bead bond alloy wire is drawn from a material with a gold purity of over 99.99%, which contains trace elements such as Ag/Cu/Si/Ca/Mg. By designing reasonable alloy components, the gold wire has the advantages of high tensile and bonding strength, good sphericity, and low vibration fracture rate. Most of the key alloy wires should be high-purity alloy wires with a purity of over 99.99%, and the total amount of trace elements should be kept below 0.01% to maintain the characteristics of gold.