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Technical Discussions
richeng
NDT Inspector,
P&W SHANGHAI ENGINE CENTER, China, Joined Mar 2009, 6

richeng

NDT Inspector,
P&W SHANGHAI ENGINE CENTER,
China,
Joined Mar 2009
6
04:34 Mar-23-2009
about magnetic particle machine

hi,

we wanna buy a magnetic particle machine to inspect aero engine parts.The longest part is about 1.8m and with 0.3m OD.The question is how to inspect the part all over its surface? the longitudinal crack and circumference crack?and how many times needed to do ?

    
 
 Reply 
 
S.V.Swamy
Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex , India, Joined Feb 2001, 787

S.V.Swamy

Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex ,
India,
Joined Feb 2001
787
09:20 Mar-23-2009
Re: about magnetic particle machine
In Reply to richeng at 04:34 Mar-23-2009 (Opening).

Dear Richeng,

Answering a few questions given below will clarify your own question.

1) Are the parts magnetic?

2) Are the parts of uniform cross section, for example, a bar or a tubular

3) What is the process of manufacture?

If the part is uniform in cross section, bench model magnetic particle testing machines are suitable. Longitudinal and circular magnetizations are possible. More details can be worked out once you are clear about the three points raised above.

Best wishes.

Swamy
Quality and NDT Expert

    
 
 Reply 
 
aldo
Engineering
Italy, Joined Jan 2009, 39

aldo

Engineering
Italy,
Joined Jan 2009
39
20:25 Mar-23-2009
Re: about magnetic particle machine
In Reply to richeng at 04:34 Mar-23-2009 (Opening).

Hi richeng..
I tinks that:
1)are correct the questions of S.V.Swamy
2) for longitudinal crack you can use the central o offset conductor and no end to end because excessive length of the part can caused eletrical arcing burning it. Is important that the rod must be coated for have not eletrical arcing
3) you can use the tipical circular magentization with coil for circumference crack. In this case you to choose central coil or wall coil..
3)you must have the plant for to operate with the parts wich have longest part
4) the choose of the specific such as ASTM E144....
Bye aldo

    
 
 Reply 
 
richeng
NDT Inspector,
P&W SHANGHAI ENGINE CENTER, China, Joined Mar 2009, 6

richeng

NDT Inspector,
P&W SHANGHAI ENGINE CENTER,
China,
Joined Mar 2009
6
03:17 Mar-24-2009
Re: about magnetic particle machine
In Reply to aldo at 20:25 Mar-23-2009 .

Dear all,

First,the parts can be magnetised.
Second,the longest shaft is not uniform cross section,and a tubular with a small side and a big side.
Third,there is a general process to all parts,but not details.

and more questions about 'flat coil', what is 'flat coil'?

    
 
 Reply 
 
richeng
NDT Inspector,
P&W SHANGHAI ENGINE CENTER, China, Joined Mar 2009, 6

richeng

NDT Inspector,
P&W SHANGHAI ENGINE CENTER,
China,
Joined Mar 2009
6
04:11 Mar-24-2009
Re: about magnetic particle machine
In Reply to richeng at 03:17 Mar-24-2009 .

dear sir,

In order to inspect all surface and all cracks,how many coils do the machine need?
(1) For pole piece inspection, use 2 coils ,22 amp rating.
(2) For vertical coil inspection, use one coil, 5 turns,
2700 amp rating.
(3) Split coil conductor, use 6000
amp rating.
(4) Flat coil, use 9 turns, 2700 amp rating.

It is some items from the general process. i'm confused about the 'coils' in the process.
so if i want to check some small ring parts,and big tubular shafts,how to choose MPI machine with whatever coils?

thanks!

    
 
 Reply 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 845

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
845
14:44 Mar-24-2009
Re: about magnetic particle machine
In Reply to richeng at 04:11 Mar-24-2009 .

Richeng,

I read your coordinates. Are you working for Pratt & Whitney?

The reason I'm asking is that I use to do lots in the aircraft industry and some of it was P&W related components. Our wet bench was the regular wet bench type. 6000 Amps output and a 5 turns coil. I also have a friend with his own shop who does work for them and the same goes for him. His machine is similar to what I've told you. If you're in the business of purchasing a wet bench, maybe you want to look at one with a fairly long bed to accomodate the engine shaft.

One other thing that come to mind, why don't you contact the P&W people in the USA or Canada. I'm sure they would be able to give you the right asnwer.

Cheerio's

    
 
 Reply 
 
Simon
Simon
15:20 Mar-24-2009
Re: about magnetic particle machine
In Reply to richeng at 04:34 Mar-23-2009 (Opening).

Log on to www.karldeutsch.com, you get more details for your reqt. They have plenty of MPI systems - Automated , Semi Automated and Manusl systems

Simon

    
 
 Reply 
 

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