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Technical Discussions
Aravind
Aravind
15:48 Jul-08-2019
Penetrant Testing DEVELOPER

Engineers,

Let me know whether it is recommended to apply Developer in DPT by Brushing Method?
Thanks

 
 Reply 
 
Rick Lopez
R & D,
John Deere - Moline Technology Innovation Center, USA, Joined Jul 2011, 191

Rick Lopez

R & D,
John Deere - Moline Technology Innovation Center,
USA,
Joined Jul 2011
191
23:42 Jul-08-2019
Re: Penetrant Testing DEVELOPER
In Reply to Aravind at 15:48 Jul-08-2019 (Opening).

Aravind,
It would help to know your process details, whether you are following a standard, and why brush application is proposed (it would not be typical). What developer form are you considering? I assume you are not thinking of dry powder or water soluble forms (poor indication contrast against the specimen surface for color contrast (dye) penetrant), but that still leaves water suspendible and nonaqueous forms.

 
 Reply 
 
Anmol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 805

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
805
20:42 Jul-09-2019
Re: Penetrant Testing DEVELOPER
In Reply to Aravind at 15:48 Jul-08-2019 (Opening).

No Brushing for developer

 
 Reply 
 
ashok kumar patra
,
Saudi K-KEM Engineering service co, Saudi Arabia, Joined May 2018, 55

ashok kumar patra

,
Saudi K-KEM Engineering service co,
Saudi Arabia,
Joined May 2018
55
06:35 Jul-11-2019
Re: Penetrant Testing DEVELOPER
In Reply to Aravind at 15:48 Jul-08-2019 (Opening).

No brushing for developer .

 
 Reply 
 
Aravind
Aravind
07:04 Jul-11-2019
Re: Penetrant Testing DEVELOPER
In Reply to Anmol Birring at 20:42 Jul-09-2019 .

Thank you sir

Is it applicable for all forms of Developer( Dry, Water Soluble, water Suspendible and Non Aqueous)?

Thank you

 
 Reply 
 
ashok kumar patra
,
Saudi K-KEM Engineering service co, Saudi Arabia, Joined May 2018, 55

ashok kumar patra

,
Saudi K-KEM Engineering service co,
Saudi Arabia,
Joined May 2018
55
14:38 Jul-11-2019
Re: Penetrant Testing DEVELOPER
In Reply to Aravind at 07:04 Jul-11-2019 .

Yes because if you brush you will take some penetrant out with it and are some type of line formation due to bristles.
and what about light uniform coating? you will get non uniform coating.

 
 Reply 
 
Peter P.
Consultant, ASNT MT/PT Level 3, Quality Manager
SharingNDT, USA, Joined Jan 2017, 80

Peter P.

Consultant, ASNT MT/PT Level 3, Quality Manager
SharingNDT,
USA,
Joined Jan 2017
80
19:37 Jul-15-2019
Re: Penetrant Testing DEVELOPER
In Reply to Aravind at 15:48 Jul-08-2019 (Opening).

Aravind,

Form b, c, and d developers are wet developers. For obvious reasons, you cannot brush these developers because you will streak the penetrant from an indication or streak any residual penetrant left on the surface after rinsing. You basically compromise the what the indication is because you pulled the penetrant out and streaked it across the surface area. It will create a lot of background and make it impossible to perform a high quality inspection.

Form a developer cannot be brushed either for the same reasons as mentioned above, but you can dip and drag it. But even then, this isn't a practical way of applying dry developer as it is meant to be applied in a dust chamber.









 
 Reply 
 
Dana
Turbocam, Inc, USA, Joined Jun 2019, 1

Dana

Turbocam, Inc,
USA,
Joined Jun 2019
1
17:20 Jul-16-2019
Re: Penetrant Testing DEVELOPER
In Reply to Peter P. at 19:37 Jul-15-2019 .

We have found dredging (dip and drag) works exceedingly well for surface cracks on small parts. If our cloud chamber method produced 10/1 signal to noise ratio, then the dredging produced 20/1. Especially good at finding fine tight cracks. However, every method has a down side. You must control penetrant contaminating the dry powder in the dredging box.
….Dana

 
 Reply 
 
Rick Lopez
R & D,
John Deere - Moline Technology Innovation Center, USA, Joined Jul 2011, 191

Rick Lopez

R & D,
John Deere - Moline Technology Innovation Center,
USA,
Joined Jul 2011
191
18:48 Jul-16-2019
Re: Penetrant Testing DEVELOPER
In Reply to Dana at 17:20 Jul-16-2019 .

Dana,
We're getting away from OP's original question, but your observations mesh well with a number of past studies. Quantitative assessment of indication luminance (brightness) showed doubled (or more) brightness was common with dip/drag technique versus other dry powder application methods. I would be curious if you had also tried isopropanol-based NAWD (form D), as those studies suggested that this variant could be even more sensitive than dip/drag dry powder.

https://4nsi.com/assets/files/Rick-Lopez-Research-in-FPI.pdf

Regards

 
 Reply 
 

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