Power Fittings Manufacturers Introduce Key Points Of Fittings Appearance Inspection
1. Cast iron parts
1.1 The appearance of cast iron is not allowed to have cracks and shrinkage. Important parts are not allowed to have defects such as pores, slag holes, sand holes and flash.
1.2 Non-important parts are allowed to have pores and sand holes with a diameter of no more than 4mm and a depth of no more than 1.5mm. Each piece should not have more than two, and the distance between the two is not less than 25mm. The two defects cannot be in the same corresponding position on the inner and outer surfaces, and the quality of galvanizing should not be reduced.
1.3 The surface where the wire clamp contacts the wire is not allowed to have defects such as burrs and zinc thorns.
2. Hardware steel parts
2.1 The shearing, profiling and punching of steel parts are not allowed to have defects such as burrs, cracks and lamination.
2.2 The cutting surface of the gas cutting should be uniform, and the chamfer should be removed.
2.3 Forgings are not allowed to have defects such as overburning, lamination, local melting, oxidation, and scaling.
2.4 The weld seam of the welded parts should be fine and flat with fine scales, and the edges should be sealed, with the undercut depth not exceeding 1mm.
2.5 The weld seam should be free of cracks, pores, and slag inclusions.
3. Copper and aluminum parts of metal fittings
3.1 The surface of copper and aluminum parts should be smooth, flat, and clean. There should be no defects such as cracks, blistering, peeling, slag inclusions, folding, pores, sand holes, severe scratches, and delamination.
3.2 The electrical contact surface of copper and aluminum parts should not have defects such as bumps, scratches, spots, pits, and embossing.
3.3 Copper and aluminum parts should be free of flash and burrs.
3.4 The drilling holes of copper and aluminum parts should be chamfered and burred, and the edges of cast holes should be rounded.
4. Metal fasteners
According to Article 7 of GB2314-85 "General Technical Conditions for Power Fittings".
