This standard applies to metal castings whose drawings or referenced standards contain porosity specifications according to VW 50097.
Older porosity specifications based on the VDG (German Foundrymen's Association) Specification P 201 shall be treated as corresponding specifications according to VW 50097.
1 Scope..2
2 Aim......2
3 Description ...2
4 Definitions ....2
5 Test procedures ....2
5.1 Specification of reference areas .......2
5.1.1 Permissible reference area geometries .....2
5.1.2 Selection and size of the reference area....3
5.1.3 Position of the reference area..3
5.2 Selection of the section and projection planes....4
5.3 Quality of the reference areas to be evaluated ...4
5.3.1 Reference areas for evaluation of pore class S ..4
5.3.2 Reference areas for evaluation of pore class D ..4
5.3.3 Reference areas for evaluation of pore class F...5
5.3.4 Reference areas for evaluation of pore class G..5
5.4 Evaluation of the reference areas.....6
5.5 Result of the porosity test ........7
5.6 Example of the porosity test ....7
6 Referenced standards ....7
A.1 Pore class D - Problems and errors during specimen preparation and evaluation ....8
A.2 Porosity determination on a metallographic polished microsection .......11
A.3 Representation of microsections of different porosity.16
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