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Technical Discussions
Win Hoo
Sales,
Malaysia, Joined Jan 2011, 25

Win Hoo

Sales,
Malaysia,
Joined Jan 2011
25
02:20 Feb-19-2012
lap joint inspection method

Dear Sir,

I have a lap joint which is a stainless steel material grade SS304
with 1.85mm wall thickness and round surface of diameter 23mm
Exisiting manufacturer use Penetrant Testing for detect the crack for
this lap joint. Question is that any other method we can use instead
of PT method.

Thanks & Regards
Win Hoo

 
 Reply 
 
LK
NDT Inspector,
Norway, Joined May 2008, 104

LK

NDT Inspector,
Norway,
Joined May 2008
104
12:00 Feb-19-2012
Re: lap joint inspection method
In Reply to Win Hoo at 02:20 Feb-19-2012 (Opening).

ET

 
 Reply 
 
LK
NDT Inspector,
Norway, Joined May 2008, 104

LK

NDT Inspector,
Norway,
Joined May 2008
104
14:35 Feb-19-2012
Re: lap joint inspection method
In Reply to LK at 12:00 Feb-19-2012 .

kind of small diameter, is it a pipe to pipe lap joint? Perhaps you can consider leak testing as well.

 
 Reply 
 
Win Hoo
Sales,
Malaysia, Joined Jan 2011, 25

Win Hoo

Sales,
Malaysia,
Joined Jan 2011
25
15:33 Feb-19-2012
Re: lap joint inspection method
In Reply to LK at 14:35 Feb-19-2012 .

Dear Lk,

Attached is the photo for lap joint.Customer are use PT for detect crack.They are looking for other method for crack detection.Thanks in an advance for your advise.

I have try with ET but the pencil probe contact surface are very small to detect surround the lap joint is very unconvenience.

Thanks & Regards
Win Hoo

 
 Reply 
 
Borja
Director
Innerspec Technologies, USA, Joined Jun 2002, 36

Borja

Director
Innerspec Technologies,
USA,
Joined Jun 2002
36
17:50 Feb-19-2012
Re: lap joint inspection method
In Reply to Win Hoo at 02:20 Feb-19-2012 (Opening).

We have done similar work in the past (lap weld inspection) using EMAT. Feel free to contact us for additional info. Www.innerspec.com.

 
 Reply 
 
Adel
Adel
16:35 Feb-20-2012
Re: lap joint inspection method
In Reply to LK at 12:00 Feb-19-2012 .

Dear Win,
Could you please send me a photo (or graph) of the lap joint. I'm interested to test this with infrared thermography (IRT). We have done similar works to detect the cracks.
www.visiooimage.com


Regards,

Adel

 
 Reply 
 
coool guy
coool guy
18:42 Feb-25-2012
Re: lap joint inspection method
In Reply to Win Hoo at 15:33 Feb-19-2012 .

where is the picture?

 
 Reply 
 
Win Hoo
Sales,
Malaysia, Joined Jan 2011, 25

Win Hoo

Sales,
Malaysia,
Joined Jan 2011
25
12:32 Feb-26-2012
Re: lap joint inspection method
In Reply to coool guy at 18:42 Feb-25-2012 .

zoom image

Lap Joint Photo

Dear Coool Guy,

Sorry for the delay.Attached is the lap joint photo for your kind perusal.
 
 Reply 
 
Dent
Consultant, NDE Manager NDELevel III/3
NDT Consultant, Canada, Joined Nov 1998, 252

Dent

Consultant, NDE Manager NDELevel III/3
NDT Consultant,
Canada,
Joined Nov 1998
252
14:41 Feb-26-2012
Re: lap joint inspection method
In Reply to Win Hoo at 12:32 Feb-26-2012 .

We would not normally call something like this a lap joint.
Looks more like a socket weld or partial penetration weld.

I think PT is your best choice.
Why do you want to use something else?

 
 Reply 
 
collin maloney
NDT Inspector, - Plant Inspector
Applus RTD, Australia, Joined Nov 2000, 147

collin maloney

NDT Inspector, - Plant Inspector
Applus RTD,
Australia,
Joined Nov 2000
147
05:28 Feb-28-2012
Re: lap joint inspection method
In Reply to Win Hoo at 12:32 Feb-26-2012 .

Win

this looks like a slip on flange welded to a pipe stub. If this is the case, looking at the UT couplant in the photo, you are looking from the wrong surface and should be testing from the flange side.
You are quoting 1.85mm wall, so PT for cracks would be more than sufficient. If you are looking for lack of penetration, a right angled pencil probe from the inside bore should do the trick.

Regards
Collin

 
 Reply 
 
Kunal
NDT Inspector,
Insight Quality Services, India, Joined Feb 2012, 2

Kunal

NDT Inspector,
Insight Quality Services,
India,
Joined Feb 2012
2
07:47 Feb-28-2012
Re: lap joint inspection method
In Reply to Win Hoo at 02:20 Feb-19-2012 (Opening).

Dear Win Hoo Sir,

U Have SS304 material, i seen the photograph of that lap joint and the penetrant testing is the best way to detect the surface cracks for this job, if u r presently testing this job by visible method and u r not getting anything then to get more sensitivity go for fluorescent method might be u got something. Still if u don't want to go with PT no matter, u can try MT if the opening of your job is like flange means hollow from inside u can try central conductor method either u go for head shot . . .

Best Regards,
Kunal :-)

 
 Reply 
 
P V SASTRY
R & D, NDT tecniques metallurgy
TAKEN VRS FROM THE POSITION OF SR. DEPUTY GENERAL MANAGER BHEL CORPORATE R&D, India, Joined Jan 2003, 195

P V SASTRY

R & D, NDT tecniques metallurgy
TAKEN VRS FROM THE POSITION OF SR. DEPUTY GENERAL MANAGER BHEL CORPORATE R&D,
India,
Joined Jan 2003
195
16:48 Feb-28-2012
Re: lap joint inspection method
In Reply to Kunal at 07:47 Feb-28-2012 .

Dear Kunal,

Your suggestion about PT is ok.

But your suggestion for MT on SS 304 material may not be a good one. This is a paramagnetic steel in normal condition. It is assumed that the filler material used is of matching composition.

This steel has a permeability of about 1 to 1.02 (Some claims go up to 1.43) in annealed condition. This is to be weighed against a permeability no. of about 200 to 800 for mild steels.

When Austenitic steels are work hardened some micro structural changes take place. Some of the austenite converts into martensite and imparts magnetic properties to the steel. But even if this particular part was work hardened by about 30% the permeability does not go up beyond 1.5 (This figure also slightly varies, some claims go up to 3.1). In view of this Still this is not a fit case for MT.

Even if it is considered that due to welding, some amount of delta ferrite is generated ( up to 5 to 8 % which is much more than the content in annealed condition) the permeability still remains to be grossly inadequate for meaningful MT.

Best wishes

P V SASTRY

 
 Reply 
 
Kunal
NDT Inspector,
Insight Quality Services, India, Joined Feb 2012, 2

Kunal

NDT Inspector,
Insight Quality Services,
India,
Joined Feb 2012
2
11:55 Feb-29-2012
Re: lap joint inspection method
In Reply to P V SASTRY at 16:48 Feb-28-2012 .

Dear Sastry Sir,
Thanks for your suggestion, I really don't know much about metallurgy and effect of heat on metal's inter molecular structure, this information is really needful for me.

Best Regards,
Kunal :-)

 
 Reply 
 

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