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Technical Discussions
Drive
Drive
14:07 Jul-15-2010
Alternating Current Field Measurement

Please I will like to know how one carries this techniques.are there any codes out there that could be of help? I know they are successfully used for weld inspections. I will like to know how one can qualify for this techniques and its major limitations...hindering it from being as prominent as the Big 6 NDT methods.

Any other comments as regards this techniques will be appreciated.

 
 Reply 
 
Jim Draper
Consultant, ASNT Level III MT PT RT VT
Draper NDT, USA, Joined Jul 2009, 99

Jim Draper

Consultant, ASNT Level III MT PT RT VT
Draper NDT,
USA,
Joined Jul 2009
99
22:09 Jul-15-2010
Re: Alternating Current Field Measurement
In Reply to Drive at 14:07 Jul-15-2010 (Opening).

I'm not sure what exactly you are asking. If you are trying to measure the magnetic field induced by a alternating curent, you can use a hall effect gauss meter made for A.C. fields. If you are wanting to know about using an A.C. Yoke for weld inspection, generally the strength of the yoke is tested by lifting a test bar with it.

 
 Reply 
 
Joe Buckley
Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT, United Kingdom, Joined Oct 1999, 528

Joe Buckley

Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT,
United Kingdom,
Joined Oct 1999
528
23:59 Jul-15-2010
Re: Alternating Current Field Measurement
In Reply to Jim Draper at 22:09 Jul-15-2010 .

"I'm not sure what exactly you are asking. "

Feel quite sorry for Dave, Martin and friends, all those years doing what I thought was an excellent job, developing promoting the technique and establishing its credibility, and there are obviously people who are completely ignorant of it...

I'm sure one of the experts will be on the forum soon, but I know that training is available in both PCN and SNT-TC-1A schemes.

The most established standard is E 2261 – 03 : " Standard Practice for
Examination of Welds Using the Alternating Current Field Measurement Technique" there are also a number of industry specific standards.

Loads of Info on http://www.tscinspectionsystems.com/

I've never used the technique in anger myself, but have worked with a lot of people who have. Having an eddy current background I was initially sceptical, (It can't be that easy....) but it seems to be a pretty reliable technique. Its limitations, when used appropriately, seem to be few, and easily predictable.

Joe

 
 Reply 
 
Jim Draper
Consultant, ASNT Level III MT PT RT VT
Draper NDT, USA, Joined Jul 2009, 99

Jim Draper

Consultant, ASNT Level III MT PT RT VT
Draper NDT,
USA,
Joined Jul 2009
99
00:51 Jul-16-2010
Re: Alternating Current Field Measurement
In Reply to Joe Buckley at 23:59 Jul-15-2010 .

That's interesting. Never heard of it, but I'm going to have to look into it.

 
 Reply 
 
Nick Welland
Other, Quality and NDT
Aben Technical Services, Australia, Joined Oct 1999, 42

Nick Welland

Other, Quality and NDT
Aben Technical Services,
Australia,
Joined Oct 1999
42
06:10 Jul-16-2010
Re: Alternating Current Field Measurement
In Reply to Jim Draper at 00:51 Jul-16-2010 .

ACFM is a very good inspection method which should be in wider use than it currently is. I have been using ACFM for over 10 years with success and have seen its use in Australia grow albeit slowly over that time, both on- and off-shore. It is run by fairly user-friendly software, but it must be interpreted by properly trained persons. I suspect the limiting factor has been in cost of equipment and the training, companies have been reactive in its promotion and its most prominent applications here are client-driven.
Cheers All,
Nick

 
 Reply 
 
Martin Lugg
Consultant,
Eddyfi Technologies, United Kingdom, Joined Nov 2000, 27

Martin Lugg

Consultant,
Eddyfi Technologies,
United Kingdom,
Joined Nov 2000
27
09:54 Jul-16-2010
Re: Alternating Current Field Measurement
In Reply to Joe Buckley at 23:59 Jul-15-2010 .

Thanks Joe! We do wonder what we've been doing since Alternating Current Field Measurement was developed in the mid 1980s.

The ASTM standard practice is the main published procedure, and is in turn referenced by ASME Code V Article 15. ACFM is also included in the ABS guide for Nondestructive Inspection of Hull Welds, a Cofrend Recommendation (in French), and NACE Standard Practice RP0296.
It is one of the 4 techniques recognised by ASNT under Electromagnetic Methods in SNT-TC-1A (2006).

Regarding certified training courses, as well as PCN and SNT, the longest running is the CSWIP scheme (aimed more at offshore inspection).

Finally, as far as use goes. It is (I think) very widely used for subsea inspection now, but take up onshore has been slower. Since it seems to be competing mainly with MT and PT (although giving depth information as well as detection) the much higher capital cost is a barrier. Service companies are understandably not keen on spending more money on kit which can do their inspections faster, if they are on a day rate from their client!

 
 Reply 
 
Drive
Drive
09:58 Jul-16-2010
Re: Alternating Current Field Measurement
In Reply to Drive at 14:07 Jul-15-2010 (Opening).

Nick and Joe.....Thanks for the responses

@ Jim .welcome to my world a few weeks back when i was ignorant of ACFM today am in a situation i have to develop its procedure, hence looking for standards, which Joe has freely given me..again joe thanks

 
 Reply 
 
Sunny Stephen
Engineering, Welding inspector
ocerancare corporation, Malaysia, Joined May 2015, 1

Sunny Stephen

Engineering, Welding inspector
ocerancare corporation,
Malaysia,
Joined May 2015
1
10:10 May-20-2015
Re: Alternating Current Field Measurement
In Reply to Joe Buckley at 23:59 Jul-15-2010 .

Good day to all..
Anyone have the ASTM standard E 2261 03:Standard Practice for Examination of Welds Using the ACFM or any download links..can share it to me. Appreciate it

here is my mail sunny9367.ss@gmail.com. Thanks in advance

 
 Reply 
 
Frank Lund
R & D,
United Kingdom, Joined Apr 2005, 222

Frank Lund

R & D,
United Kingdom,
Joined Apr 2005
222
16:43 May-20-2015
Re: Alternating Current Field Measurement
In Reply to Sunny Stephen at 10:10 May-20-2015 .

E2261 - 03 has been updated to E2261 - 07. I helped revise it to the "07" version to take account of the restrictions of the technique and the disturbances which affect it.

Are many people relying upon the outdated version?

 
 Reply 
 

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