Gage R&R for a destructive Test

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Gage R&R for a destructive Test

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Author	Topic: Gage R&R for a destructive Test
RLBredeweg Lurker (<10 Posts) Posts: 2 From:Grandhaven,Mi.USA Registered: May 2001	posted 21 May 2001 09:16 AM Gage R&R for destructive Test- What the test is is called is a "weld breakout test" they use a hydraulic press with a gage(Pressure meter) that reads in psi the part is fixtured and a ball on the end of the press comes down and pushes on the weld seam - Minimum specification for fracture is 3,000 Lbs. - No Max spec (infinity) or weld fracture. What I was considering is to verify the accuracy of the gage with a certified strain gage for correlation to the psi meter and than to review the last 30 days of measurement recordings (which I found out were being recorded as pass/fail) I have to respond back for a CAR written by our Registrar ASAP Can any body give a suggestion? IP: Logged
Dan Larsen Forum Contributor Posts: 137 From:Sussex, WI Registered: Feb 2001	posted 21 May 2001 04:43 PM My experience is with hardness measurements...may be similar, maybe not. First, you should consider the gage R&R not in terms of the actual test as much as the unit being used for the test. Use (if available) a standard for your pressure machine. Use the same standard, across a variety of operators, and the classic GRR procedure to calculate operator and machine influence. (NOTE: This is NOT a true GRR, but it is a gage CAPABILIY.) You can use the gage CAPABILITY in conjuntion with PROCESS CAPABILITY (your historical test values) to determine a true GRR. This is too ornate to try to explain here...I suggest Concepts for R&R Studies by Larry Barrentine for a more thorough evaluation. Or send me private e-mail or give me a call...see my profile. IP: Logged
Marc Smith Cheech Wizard Posts: 4119 From:West Chester, OH, USA Registered:	posted 21 May 2001 05:27 PM From Spaceman Spiff a while back: -> The best method I found for MSA on destructive testing is -> through using the ISOPlot method developed by Dr. Dorian -> Shainin (see www.shainin.com for information). -> -> Basically, I would take 2 consecutive samples as a group -> and collect a total of 30 groups. Next I would use sample -> 1 of each group as Trial 1 and sample 2 of each group as -> Trial 2. Then I would plot Trial 1 versus Trial 2 and -> determine the discremination ratio. It is very similar to -> correlation, but the method of calculating discrimination -> ratio is the key to qualify the measurement system. There -> is a software to do this from Shainin -> ( www.shainin.com/RedXTracker/ ). -> -> Check it out! [This message has been edited by Marc Smith (edited 21 May 2001).] IP: Logged
Brian Dowsett Forum Contributor Posts: 35 From:Waterford, Ireland Registered: Nov 1999	posted 13 June 2001 12:27 PM The way I got around this (albeit for a Q1 audit) was to build a rig that simulated the thing being tested. So if we're applying force to a weld to destruction, build a rig that "gives" at a typical range of values, maybe by lifting a set weight through a lever system. Cheers Brian IP: Logged

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