Analysis of common defects in castings

Casting porosity This is a small cavity formed by the gas which can not escape during the solidification of metal. The inner wall of the cavity is smooth and contains gas. It has a high reflectivity to the ultrasonic wave. However, because it is basically spherical or ellipsoidal, that...


Internal casting defects of die casting (part 1)

1 Casting porosity (1) Features and inspection methods: After dissection, appearance inspection or flaw detection showed that the pores had smooth surface and round shape. (2) Causes: ① The introduction direction of the alloy liquid is unreasonable or the flow speed of the metal liquid is too high, resulting...