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Technical Discussions
MIKE MACKE
NDT Inspector
GE Inspection Services, USA, Joined Aug 2001, 8

MIKE MACKE

NDT Inspector
GE Inspection Services,
USA,
Joined Aug 2001
8
00:03 Aug-14-2001
Micro weld inspection

How would you inspect for a full penetration weld for a 3mm diameter ball welded to a tapered cylinder set. Also a 3 mm disc by 0.8mm thick is inserted into cylinder valve top and is laser welded...Cylinder wall is 0.8mm thick the weld penetration has to be a min of 0.02mm deep to accept....what is a good technique to examine directly off the production line for addaquate weld penetration. I was thinking of real time rt with some sort of optical comparitor. The image would be 10X?

Regards M.C. Macke


 
 Reply 
 
Dave Utrata
R & D,
Center for NDE, Iowa State University, USA, Joined Feb 2000, 37

Dave Utrata

R & D,
Center for NDE, Iowa State University,
USA,
Joined Feb 2000
37
00:20 Aug-14-2001
Re: Micro weld inspection
Sounds like the geometry and make-up of the part are under tight control. This assumes your flaw tolerance will be within a fairly tight window.
While I wouldn't rule out UT at this point (assuming the geometry does in fact allow) I'd suggest going to a resonant or multi-frequency test method. Either would be at least as costly up front as the RT you suggest, but both lend themselves well to high-volume production/inspection.


: How would you inspect for a full penetration weld for a 3mm diameter ball welded to a tapered cylinder set. Also a 3 mm disc by 0.8mm thick is inserted into cylinder valve top and is laser welded...Cylinder wall is 0.8mm thick the weld penetration has to be a min of 0.02mm deep to accept....what is a good technique to examine directly off the production line for addaquate weld penetration. I was thinking of real time rt with some sort of optical comparitor. The image would be 10X?
.
: Regards M.C. Macke
.



 
 Reply 
 
M. Kim Johnson
M. Kim Johnson
01:15 Aug-14-2001
Re: Micro weld inspection
I am with Quasar International, Inc. We would be glad to look at your problem. We produce Resonant Inspection (Resonant Ultrasound Spectroscopy) systems for the type of inspection you are presenting. We already inspect welded parts looking for these type effects.

M. Kim Johnson

: Sounds like the geometry and make-up of the part are under tight control. This assumes your flaw tolerance will be within a fairly tight window.
: While I wouldn't rule out UT at this point (assuming the geometry does in fact allow) I'd suggest going to a resonant or multi-frequency test method. Either would be at least as costly up front as the RT you suggest, but both lend themselves well to high-volume production/inspection.
.
:
: : How would you inspect for a full penetration weld for a 3mm diameter ball welded to a tapered cylinder set. Also a 3 mm disc by 0.8mm thick is inserted into cylinder valve top and is laser welded...Cylinder wall is 0.8mm thick the weld penetration has to be a min of 0.02mm deep to accept....what is a good technique to examine directly off the production line for addaquate weld penetration. I was thinking of real time rt with some sort of optical comparitor. The image would be 10X?
: .
: : Regards M.C. Macke
: .
.



 
 Reply 
 
Gordon E. Smith
Consultant
H.C.Nutting, Co., USA, Joined Nov 1998, 6

Gordon E. Smith

Consultant
H.C.Nutting, Co.,
USA,
Joined Nov 1998
6
02:18 Aug-16-2001
Re: Micro weld inspection
I Mike,

I agree with the resonant test method as being you best bet..Capital Dollar$ up front but low cost per part..

This technology is currently being used on small welded automotive parts and at some time in the past by GE CanNuc (Canadian Nuclear Fuels Group).

See the McMaster NDT handbook for basics..

Or eMail me (Ex GE SuperAbrasives NDT III)
.
Gordon


 
 Reply 
 
marsha deloach
marsha deloach
04:10 Aug-12-2002
Re: Micro weld inspection
Is there a formula for determining depth for weld penetration?
: I am with Quasar International, Inc. We would be glad to look at your problem. We produce Resonant Inspection (Resonant Ultrasound Spectroscopy) systems for the type of inspection you are presenting. We already inspect welded parts looking for these type effects.
.
: M. Kim Johnson
.
: : Sounds like the geometry and make-up of the part are under tight control. This assumes your flaw tolerance will be within a fairly tight window.
: : While I wouldn't rule out UT at this point (assuming the geometry does in fact allow) I'd suggest going to a resonant or multi-frequency test method. Either would be at least as costly up front as the RT you suggest, but both lend themselves well to high-volume production/inspection.
: .
: :
: : : How would you inspect for a full penetration weld for a 3mm diameter ball welded to a tapered cylinder set. Also a 3 mm disc by 0.8mm thick is inserted into cylinder valve top and is laser welded...Cylinder wall is 0.8mm thick the weld penetration has to be a min of 0.02mm deep to accept....what is a good technique to examine directly off the production line for addaquate weld penetration. I was thinking of real time rt with some sort of optical comparitor. The image would be 10X?
: : .
: : : Regards M.C. Macke
: : .
: .
.



 
 Reply 
 

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