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Nondestructive Testing of Plum Blossom Coupling Forgings

Publisher:Jinchi Machinery and Equipment
2019-06-04

  1. The forgings of plum-blossom coupling should be free of cracks, white spots, folding, severe ingot segregation and serious non-metallic inclusions.

  2. Ultrasound inspection of plum-blossom coupling forgings is carried out in accordance with the regulations of JB/T1581-1996 or JB/T1582-1996. The requirements of ultrasonic injury control are as follows:

  A. Individual dispersed defects with equivalent diameter less than 2 mm are not counted, but should be recorded and reported to the buyer;

  B. No defects with equivalent diameter greater than 5 mm are allowed.

  C. If there are serious defects, the two sides shall negotiate and deal with them.

  3. When there is a requirement on the forging pattern of the demander, the magnetic powder inspection of the forging shall be carried out in accordance with JB/T6063-1992 after finishing. The requirements for magnetic particle inspection are as follows:

  A. Defects not less than 1 mm in length should be recorded.

  B. No defective accumulation of magnetic powder with a length greater than 5 mm is allowed.

  C. When the distance between the linear defects on the same bus is less than three times the length of the larger defects, it is calculated by one line.

  D. Defects greater than 5 mm in length, allowed to be partially polished within the tolerance range specified in the pattern, and re-examined after polishing.

  4. Metallographic test of plum-blossom coupling forgings determines grain size according to YB/T5148-1993. The actual grain size should not be less than 4 grades.

  5. The dimension and surface roughness of the forgings of plum blossom coupling shall conform to the requirements of the drawings provided by the buyer.