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Re: Laser-Ultrasonic NDT

Posted by: Rainer Meier (PID_127), E-mail: rainer.meier@erl11.siemens.de, on April 18, 2000 at 15:19 :

In Reply to: Re: Laser-Ultrasonic NDT posted by : MATTHEW GODFREY on April 18, 2000 at 13:34:

: I HAVE RECENTLY BEEN LOOKING AT A WAY OF TESTING LASER
WELDS, I WORK FOR GENERAL MOTORS AND I AM CURRENTLY DEVELOPING
A SYSTEM WITH KRAUTKRAMER IN COLONGE. I MAY HAVE SOME
INFORMATION THAT IS OF USE TO YOU. AND VICE VERSA, IF
YOU HAVE ANY INFORMATION THAT MAY HELP ME. PLEASE
CONTACT ME AT THE ABOVE E ADDRESS.

Dear Mr. Goodfrey,

we develloped a UT-technique for the inspection of laserwelded
tube sleeves. The tubes and sleeves were made from inconel, which
shows a very coarse and directed grain structure in the weld zone.
(I suppose, you want to inspect aluminum welds, where the coarse
grain structure is possibly a not so big problem).

Two things were very important: The use of focused UT-beam (beam
width 0.3 mm) to have a sufficient resolution at a weld with of
appr. 1 mm in the keyhole area and a broad band transducer with
a center frequency of 15 MHz. The UT inspection is done in 0°
immersion technique.

As the result of our devellopment, we are able to determine the
weld width and to inspect the weld for flaws. The condition of the
weld crone is a sensitive parameter: it must be smooth enough.

I don't know your inspection problem in detail, but I suppose it's
not so critical than ours (which was for a German Nuclear
Power Plant). So I think there are solutions without grounding the
weld crown. It would be interesting, to know your inspection
requirements.

Rainer Meier
Siemens NDT
Freyeslebenstrasse 1
D-91058 Erlangen
Germany

Phone +49 9131 183881
Fax +49 9131 187547
mail Rainer.Meier@erls11@siemens.de

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Comments:
: : I HAVE RECENTLY BEEN LOOKING AT A WAY OF TESTING LASER : WELDS, I WORK FOR GENERAL MOTORS AND I AM CURRENTLY DEVELOPING : A SYSTEM WITH KRAUTKRAMER IN COLONGE. I MAY HAVE SOME : INFORMATION THAT IS OF USE TO YOU. AND VICE VERSA, IF : YOU HAVE ANY INFORMATION THAT MAY HELP ME. PLEASE : CONTACT ME AT THE ABOVE E ADDRESS. : Dear Mr. Goodfrey, : we develloped a UT-technique for the inspection of laserwelded : tube sleeves. The tubes and sleeves were made from inconel, which : shows a very coarse and directed grain structure in the weld zone. : (I suppose, you want to inspect aluminum welds, where the coarse : grain structure is possibly a not so big problem). : Two things were very important: The use of focused UT-beam (beam : width 0.3 mm) to have a sufficient resolution at a weld with of : appr. 1 mm in the keyhole area and a broad band transducer with : a center frequency of 15 MHz. The UT inspection is done in 0° : immersion technique. : As the result of our devellopment, we are able to determine the : weld width and to inspect the weld for flaws. The condition of the : weld crone is a sensitive parameter: it must be smooth enough. : I don't know your inspection problem in detail, but I suppose it's : not so critical than ours (which was for a German Nuclear : Power Plant). So I think there are solutions without grounding the : weld crown. It would be interesting, to know your inspection : requirements. : Rainer Meier : Siemens NDT : Freyeslebenstrasse 1 : D-91058 Erlangen : Germany : Phone +49 9131 183881 : Fax +49 9131 187547 : mail Rainer.Meier@erls11@siemens.de

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