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Technical Discussions
Len Andersen 212-839-6599
Engineering
New York City Department of Transportation, USA, Joined Nov 2009, 31

Len Andersen 212-839-6599

Engineering
New York City Department of Transportation,
USA,
Joined Nov 2009
31
15:27 Feb-11-2010
Partial-Joint-Penetration Welds and Current UT Capabilities

Ladies and Gentlemen,
I read the February 2010 "Welding Journal" article, "Oil Industry Challenges for the 21st Century". Hardy Campbell's ( hardycampbell@aol.com ). The author’s views on UT acceptability on PJP did not mention Phase Array. Your views would be appreciated.
Sincerely
Len Andersen
Construction Project Manager
landersen@dot.nyc.gov / 212-839-6599 / FAX 4042 / Administrative Assistant 4012
www.lenandersen.com

 
 Reply 
 
Roger Duwe
NDT Inspector, API-510, 570, 653
MISTRAS, USA, Joined Jan 2009, 148

Roger Duwe

NDT Inspector, API-510, 570, 653
MISTRAS,
USA,
Joined Jan 2009
148
20:44 Feb-16-2010
Re: Partial-Joint-Penetration Welds and Current UT Capabilities
In Reply to Len Andersen 212-839-6599 at 15:27 Feb-11-2010 (Opening).

Len,
Phased Array will give you a better look at the fusion/lack-of-fusion area. Should be able to see defects at the bottom of the weld a little better. If the PA scan is recorded, the actual depth of fusion can be measured very accurately [assuming a well calibrated instrument].

Basically, the only drawbacks of PA over manual UT-shearwave is the extra training required to be a competent inspector, increased cost of equipment, and somewhat slower scanning speed. The cause for the slower speed, in my case, is that there is more data to evaluate being presented. That is a good thing.

 
 Reply 
 
Carlos Correia
R & D, - -
UCV & EGROUP, Venezuela, Joined Oct 2008, 120

Carlos Correia

R & D, - -
UCV & EGROUP,
Venezuela,
Joined Oct 2008
120
00:08 Feb-17-2010
Re: Partial-Joint-Penetration Welds and Current UT Capabilities
In Reply to Roger Duwe at 20:44 Feb-16-2010 .

Hello Len, in my opinion you also shall to consider the focusing capabilities of your system (the combination of your transducer, wedges and equipment). The limit of your focusing potential is the near field of your “system”, an important part of your near field length could be retained in the wedge… So, the focusing capability of your system is restricted. If you couldn’t focus the beam in the area you need to explore, you can oversize the reflectors.
Regards

 
 Reply 
 

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