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FASTENER TIPS: TESTING, TEST REPORTS, SUPPLIER OVERSIGHT

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Presentation on theme: "FASTENER TIPS: TESTING, TEST REPORTS, SUPPLIER OVERSIGHT"— Presentation transcript:

1 FASTENER TIPS: TESTING, TEST REPORTS, SUPPLIER OVERSIGHT
Approved for Public Release

2 Topics Past Problems Quality Control Test Methods Test Variables
Test Report Content Fastener Testing Approved for Public Release

3 Past Problems Lack of hydrogen embrittlement relief Wrong wedge angles
Wrong gage lengths Sampling Process control of piercing diameter Concentricity of head and/or socket to shank Fastener Testing Approved for Public Release

4 Piercing Diameter Minor Diameter Out of Tolerance
Minor Diameter Within Tolerance Fastener Testing Approved for Public Release

5 Concentricity Socket is not centered in the head of the screw
Head and shank are not concentric Fastener Testing Approved for Public Release

6 Topics Past Problems Quality Control Test Methods Test Variables
Test Report Content Fastener Testing Approved for Public Release

7 Mil-I-45208 “Inspection System Requirement” Requires:
Quality Control Mil-I “Inspection System Requirement” Requires: Clear and concise procedures. (Para ) Use of calibrated equipment. (Para. 3.3) Providing and maintaining adequate records (i.e. Objective Quality Evidence (OQE)). (Para ) Other quality standards may apply ,however the rules are basically the same (e.g. MIL-Q-9858, ISO 9001). Fastener Testing Approved for Public Release

8 Topics Past Problems Quality Control Test Methods Test Variables
Test Report Content Fastener Testing Approved for Public Release

9 Test Methods ASTM F606 Standard Testing Methods Are Typically Invoked Unless Otherwise Specified Tensile / Yield / Elongation (Mach. specimens) Axial Tension (Full Size fasteners) Proof load (Full Size fasteners) Wedge tension (Full Size fasteners) Hardness Fastener Testing Approved for Public Release

10 Test Methods Flat surface Cylindrical surface Hardness testing performed on a convex cylindrical surface Correction factors of ASTM E18 need to be applied Fastener Testing Approved for Public Release

11 Determination Of Proper Wedge Angle For Wedge Testing
Test Methods Determination Of Proper Wedge Angle For Wedge Testing ASTM F606 (Unless otherwise specified) ASTM A574 (Socket Head Cap Screws) MIL-S-1222H3 (Titanium, SC ) Fastener Testing Approved for Public Release

12 Gage Lengths Are Different For Ferrous And Non-ferrous Fasteners
Test Methods Gage Lengths Are Different For Ferrous And Non-ferrous Fasteners Fastener Testing Approved for Public Release

13 Plated Steel Fasteners May Require Additional Processing And Testing
Test Methods Plated Steel Fasteners May Require Additional Processing And Testing The plating process can cause Hydrogen Embrittlement of steel fasteners. Post plate baking is normally required to drive off hydrogen introduced into the base material Hydrogen Embrittlement can cause delayed cracking. Stress Durability Testing may be required to determine the effectiveness of the post plate baking process. Fastener Testing Approved for Public Release

14 Determining Sample Size And Test Requirements
Test Methods Determining Sample Size And Test Requirements The manufactured lot size is needed to determine the correct number of samples. Type of specimens. Machined specimens Full size fasteners Fastener Testing Approved for Public Release

15 Determining sample size and test requirements
Test Methods Determining sample size and test requirements FF-S-86 Fastener Testing Approved for Public Release

16 Determining sample size and test requirements
Test Methods Determining sample size and test requirements FF-S-86 Fastener Testing Approved for Public Release

17 Determining sample size and test requirements
Test Methods Determining sample size and test requirements Mil-S-1222 Fastener Testing Approved for Public Release

18 Determining sample size and test requirements
Test Methods Determining sample size and test requirements Mil-S-1222 Fastener Testing Approved for Public Release

19 Topics Past Problems Quality Control Test Methods Test Variables
Test Report Content Fastener Testing Approved for Public Release

20 Variables that can affect test results
Test Variables Variables that can affect test results Fixturing, Alignment. Speed of applied load. Test Specimen preparation (Surface finish). Tool marks act as stress risers. Fastener Testing Approved for Public Release

21 Topics Past Problems Quality Control Test Methods Test Variables
Test Report Content Fastener Testing Approved for Public Release

22 Test Reports Name of Testing Organization Date of the test
Purchase Order number and Item number Manufactured lot size Material Spec. Alloy, Type, Class, Grade, Condition Type of specimen tested (machined vs. full size) Traceability to hardware (Lot Code) Acceptance criteria. Statement of acceptance or rejection Units should be the same as those contained in the acceptance spec. (lbs vs. psi) Signature of test organization representative and date. Fastener Testing Approved for Public Release

23 Test Reports C of C Fastener Testing Approved for Public Release

24 Test Reports Chemicals
Fastener Testing Approved for Public Release

25 Test Reports Mechanicals
Fastener Testing Approved for Public Release

26 Test Reports Mechanicals
Fastener Testing Approved for Public Release

27 Test Reports Mechanicals
Fastener Testing Approved for Public Release

28 Test Reports NDT Fastener Testing Approved for Public Release

29 Test Reports NDT Fastener Testing Approved for Public Release

30 Summary Past Problems Quality Control Test Methods Test Variables
Test Report Content Fastener Testing Approved for Public Release


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