Hardness Testing Procedure

PMI Just In Case Positive Material Identification Ferritscope & Hardness Testing

QUALITY DOCUMENT

HARDNESS TESTING PROCEDURE

DOCUMENT No

QD-HT-01

REVISION

01

DATE

21st August 2012

PMI JUST IN CASE, Fern House, 32 Fern Valley, Crook, Co. Durham, DL15 9PZ Tel: 01388 763527 Mob: 07846 185234 e-mail: e-mail: [email protected] web: www.pmijustincase.co.uk

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Hardness Testing Procedure ________________________________________________________________________________

Contents

Revision 01 st 21 Aug 2012

1.0

Purpose

2.0

Scope

3.0

References

4.0

Training

5.0

Safety

6.0

Equipment

7.0

Procedure

8.0

Identification and Marking

9.0

Reporting

Appendix I

Sample Report

Uncontrolled when printed

QD-HT-01 Page 1 of 5

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1.0

Purpose To define the scope and method of carrying out Hardness Testing (HT) using an Equotip 3. This form of testing is an effective way of determining hardness of a material without leaving a permanent mark in the area tested.

2.0

Scope This procedure is a standard procedure that describes the methods for carrying out Hardness Testing on materials and components, during manufacture and in service. All material/part types which are subjected to Hardness Testing will be clearly detailed on the Hardness Test Report.

3.0

References Equotip 3 Portable Hardness Tester Operating Manual. Standardized according to ASTM A956 and DIN 50156

4.0

Training Personnel applying this procedure shall be familiar with this procedure and only trained personnel are permitted to operate the Equotip 3 Portable Hardness Tester Directors of PMI Just In Case have attended a manufacturers training course in the use of the Equotip 3 equipment. Personnel subsequently employed by PMI Just In Case are trained in house.

5.0

Safety All activities will be carried out in accordance with the site Health, Safety and Environmental Policy and Site Safety Manual. Testing, monitoring and control of the hardness test shall be undertaken by experienced / authorised personnel only.

6.0

Equipment Equotip uses a proven, dynamic testing principle. An impact body with a hard metal test tip is propelled by spring force against the surface of the test piece. Surface deformation takes place when the impact body hits the test surface, which will result in loss of kinetic energy. This energy loss is detected by a comparison of velocities vi and vr when the impact body is at a precise distance from the surface for both the impact and rebound phase of the test, respectively.




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Velocity measurements are achieved through a permanent magnet in the impact body that generates an induction voltage in t he coil of the impact device. The signal voltage is proportional to the velocity of the impact body. Signal processing provides the hardness reading for display and storage.       

 

7.0

The large LCD display always shows how the Equotip is configured to test. Variable function keys allow for quick change of common test parameters. Converts to all common hardness scales (HV, HB, HRC, HRB, HS, Rm) No subjective measuring errors are possible, giving highly repeatable results. Internal self diagnostics with error messages assure reliable test results. Readings can be stored automatically in the internal memory or sent directly to a printer. In addition to the above, a certified reference Test Piece supplied by Proceq can be used as a comparison between readings obtained and actual certified readings to confirm the accuracy of the machine. Automatic compensation for impact direction Accurate on curved test surfaces (R > 10mm)

Procedure Surface Preparation 



The surface condition of components to be tested and the reference materials shall be free of any foreign material, including oxidation, which may interfere with the test. Analysis shall only be carried out on surfaces that are bare metal with no residual contaminants from scales, coatings, paints or embedded remnants from contact with other materials.

Reference Set-up Samples and Equipment Checks For standard testing, set-up check readings shall be carried out on the calibrated Test Piece, as a minimum: 

Each time the analyser is switched on

and re-confirmed at least at the following times:      

At intervals not exceeding each 200 determinations carried out Each time a different Standard or material range is required If there is a significant change in equipment or material temperature Whenever the equipment has been accidently knocked or adjusted Whenever any error is suspected Immediately at the end of a work session

Reading Frequency 

As a minimum 3 readings shall be taken in each designated area, and the average value calculated. All readings shall be reported, including the average, in the format is shown in Appendix 1.

Witness Tests 

All readings and recordings associated with the test shall be available for third party witness.




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1. Load Load the impact device by sliding the loading tube forward.

8.0

2. Place Place and hold the impact device on the surface of the test piece at the desired test point.

3. Measure Trigger the impact by pressing the trigger button. The hardness value will be instantaneously displayed

4. Display Showing all information on a large clear display.

Identification and Marking When required by the client or contract, all test items and verified to be within the specified tolerance shall be stamped, using 3mm low stress stamps, with hardness value and scale.

9.0

Reporting All test results shall be the subject of a typed test report, which shall be issued on completion of the testing. If another reporting format is required, it shall be specified by the client or contract. In such instances, the client shall supply the relevant report sheets and copies of all completed reports will be retained on file. The test report sheet shall generally contain, as a minimum, the following information:

          

Client Client Reference No Part Identification Date of Test Report No Procedure No, and Revision Equipment used Material type Descripti on of component tested Readings taken and average Operator name and Signature.

The Client will be made aware of all readings which fall outside of specification requirements as stated on drawings and responsibility of accepting or otherwise will be solely theirs. Where required, or advised by the client, notes referring to any inaccuracies will be made in the Comment box at the end of the report.




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APPENDIX I




Hardness Testing Procedure

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