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Technical Discussions

Dale Thorpe

01:11 Sep-08-1999
NDT of Fine Wire

AMS is a contract NDT service company to the automotive safety industry, specifically high volume ultrasonic examination of Airbag canister and inflators. We are currently involved in an R&D program for one of our clients that has brought to us a most unusual problem, at least for us.

The problem is brittle fracture of wire in their ignitors. The wire, or more correctly Bridgewire is used in pyro-technic devices and ordinace explosives. The brigewire is 98% platinum and 2% tungsten. The diameter is 0.00075" (in). Each spool contains an average of 7,000ft and as many as thirty spools are being consumed daily.

Wire that has failed will have a lower tensile <170,000 and low elongation <6%.

I would be interested in knowing if any one on this thread has had any experience with this type of problem?

Dale Thorpe
President
AMS (602)442-1899
dale@ndt-inspection.com

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PL Sorenson

04:00 Sep-09-1999
Re: NDT of Fine Wire : AMS is a contract NDT service company to the automotive safety industry, specifically high volume ultrasonic examination of Airbag canister and inflators. We are currently involved in an R&D program for one of our clients that has brought to us a most unusual problem, at least for us.

: The problem is brittle fracture of wire in their ignitors. The wire, or more correctly Bridgewire is used in pyro-technic devices and ordinace explosives. The brigewire is 98% platinum and 2% tungsten. The diameter is 0.00075" (in). Each spool contains an average of 7,000ft and as many as thirty spools are being consumed daily.

: Wire that has failed will have a lower tensile <170,000 and low elongation <6%.

: I would be interested in knowing if any one on this thread has had any experience with this type of problem?

: Dale Thorpe
: President
: AMS (602)442-1899
: dale@ndt-inspection.com

You might want to contact Sandia's Explosive Technology Group. See http://www.sandia.gov/explosive/labs.htm
It appears they have sufficient expertise in this area to be able to help.

Pete Sorenson

P.L. Sorenson - Technical Consultant

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Mark Davis
Teacher, And Consultant
University of Ultrasonics, Birmingham, Alabama, USA, Joined Mar 2000,

⁸⁵

Mark Davis
Teacher, And Consultant
University of Ultrasonics, Birmingham, Alabama,
USA,
Joined Mar 2000

⁸⁵

00:39 Dec-02-1999
Re: NDT of Fine Wire Dear Dale,

This looks like a digital radiography solution. One you could radiograph the product with film and then digitally enhance the film to look for the defect.

Or just shoot the parts on a digital plate and then enhance the images to look. We can also use geometric enlargement to images the wires.

Sincerely,

J. Mark Davis

My number is

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