PORTABLE HARDNESS TESTING
Hardness testing is considered as one of the best tools for judging the quality of heat treatment. For site inspections portable hardness testers are used.
One of the popular method of the harness testing is using poldi hardness tester.
Poldi hardness tester is having a standard test bar and a test facility on which hammering is done for indentations. The diameter of indentations in the bar and the parent material are taken and the hardness value HB can be read from the standard chart available with poldi tester. Poldi uses impact method of indentation.
The procedure for using Poldi Hardness Tester is as below
1. Preparation of the area for hardness testing - The area should be flat
2. Selection of standard Poldi bar - Bar factor nearly 1.00
3. Place the bar in the striker yoke of Poldi tester
4. Position the bar on the area and strike it with medium weight hammer (2kg) to get 3.0 to 4.0 mm indentation on the bar.
5. Measure the actual indentation on the bar and job by microscope of the Poldi set
6. Calculate BHN using the chart available with Poldi Set.
The procedure for using Poldi Hardness Tester is as below
1. Preparation of the area for hardness testing - The area should be flat
2. Selection of standard Poldi bar - Bar factor nearly 1.00
3. Place the bar in the striker yoke of Poldi tester
4. Position the bar on the area and strike it with medium weight hammer (2kg) to get 3.0 to 4.0 mm indentation on the bar.
5. Measure the actual indentation on the bar and job by microscope of the Poldi set
6. Calculate BHN using the chart available with Poldi Set.
Image taken from www.practicalmaintenance.net
Image taken from www.captain-engineering.blogspot.com
ENLARGED VIEW OF THE TEST END OF THE POLDI TESTER
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