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Nondestructive testing CHD/NHD/SHD/FHD/Hardness of surface heat treatment

Hardening depths: case-hardening depth (CHD) after carburizing, nitriding hardness depth (NHD) after nitriding, surface-hardening depth (SHD) after induction hardening, and the fusion hardness depth (FHD) after laser hardening are the most important quality characteristics of surface-hardened workpieces, in addition, hardness and residual stress values at the surface and in the bulk or even the depth-profiles, all which can be tested non-destructively by 3MA technique.

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Gear/Bearing Grinding Burns and Residual Stress nondestructive testing by 3MA

For years, grinding burns has been detected and characterized nondestructively by 3MA technique. Gearwheel or bearing could be systematically examined in running tests with regard to its tooth flank load capacity and with regard to the change of the material properties in the tooth flanks. "3MA gearwheel scanner" allows for the tooth flanks to be scanned in meander-shaped surface scans.

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Advantages and disadvantages of Rockwell hardness destructive test methods

Rockwell hardness values obtained with different process variants cannot be compared with each other. In addition, the hardness value obtained with a certain process method must lie within a certain range. For values outside this range, the method should be changed because the indenter has either penetrated too strongly or too weakly into the material.

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