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Technical Discussions
Brian Younce
Brian Younce
05:13 Dec-20-2000
Mechanical Cleaning Prior To Magnetic Particle Inspection

NDT Folks,
I am wondering if anyone has information regarding mechanical cleaning prior to magnetic particle inspection. The specific application would be removing heat treat scale prior to magnetic particle inspection. One method that we are considering is a glass media blast. My concerns would be metal smearing or discontinuity contamination.
I would like to hear of any specific practices which some of you may use for this same type of application. Thank you in advance for any help.
Regards,
Brian


    
 
 Reply 
 
Dave Ronson
Dave Ronson
06:16 Dec-20-2000
Re: Mechanical Cleaning Prior To Magnetic Particle Inspection
: NDT Folks,
: I am wondering if anyone has information regarding mechanical cleaning prior to magnetic particle inspection. The specific application would be removing heat treat scale prior to magnetic particle inspection. One method that we are considering is a glass media blast. My concerns would be metal smearing or discontinuity contamination.
: I would like to hear of any specific practices which some of you may use for this same type of application. Thank you in advance for any help.
: Regards,
: Brian

I would suggest you try using a chemical such as Ardrox 185 used with Ardrox 188 a high alkaline type product which is made for steel components to remove heat scale. Unfortnatlry, you will have to heat both products to around 180 degrees F. It is not a feild application.




    
 
 Reply 
 
Tom Murphy
NDT Inspector
USA, Joined Jul 2000, 16

Tom Murphy

NDT Inspector
USA,
Joined Jul 2000
16
06:39 Dec-20-2000
Re: Mechanical Cleaning Prior To Magnetic Particle Inspection
We commonly use glass bead blasting. We perform MT
inspection of steam turbine components after a period
of service. They have heat scale after they have run
for awhile. Our procedure requires that the glass
shot should be of a high grade crown glass of the
soda lime type with silica content >62%. It also
recommends a spherical shape and bead diameters of
0.006 inches to 0.010 inches in diameter. The beads
are not to be reused.

Regards,
Tom

: NDT Folks,
: I am wondering if anyone has information regarding mechanical cleaning prior to magnetic particle inspection. The specific application would be removing heat treat scale prior to magnetic particle inspection. One method that we are considering is a glass media blast. My concerns would be metal smearing or discontinuity contamination.
: I would like to hear of any specific practices which some of you may use for this same type of application. Thank you in advance for any help.
: Regards,
: Brian




    
 
 Reply 
 
Barry J Gordon
Barry J Gordon
01:50 Dec-20-2000
Re: Mechanical Cleaning Prior To Magnetic Particle Inspection
: NDT Folks,
: I am wondering if anyone has information regarding mechanical cleaning prior to magnetic particle inspection. The specific application would be removing heat treat scale prior to magnetic particle inspection. One method that we are considering is a glass media blast. My concerns would be metal smearing or discontinuity contamination.
: I would like to hear of any specific practices which some of you may use for this same type of application. Thank you in advance for any help.
: Regards,
: Brian


Brian,

In circumstances where we don't want discontinuity contamination such as turbine blades we use bicarb soda blasting. It is very gentle on the parent material but will still remove a strong build up of scale and has the added advantage of being environmentally friendly.


    
 
 Reply 
 

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