Classification of Discontinuities

Pipe Defect: A discontinuity in the centre of the ingot, caused by cavities formed during solidification Becomes elongated in rolling operations Not usually visible on the surface of the article.

 

Processing Discontinuities

2nd stage of discontinuity

Generated by forming or fabrication operations subdivided into: primary processing discontinuities: Casting, rolling, forging.

Secondary processing discontinuities – Machining, grinding, heat treating, welding, plating.

Image result for pipe defect in ingot

Primary Processing Discontinuities – Casting

  1. Inclusions
  2. Porosity
  3. Cold shuts
  4. Hot tears
  5. Shrinkage cavities

 

 

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