where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -

Vidisco Ltd.
Vidisco Ltd. is the leading designer and manufacturer of state-of-the-art Digital Radiography systems.

2249 views
Technical Discussions
azmi
azmi
01:21 Jul-04-2007
UT after MT. Surface preparation

Does it enough to perform UT after MT with manual cleaning on surface after MT? What i mean, UT still can be performed eventhough the weld surface is not cleaned by power brush.


    
 
 
chris s
chris s
08:00 Jul-06-2007
Re: UT after MT. Surface preparation
----------- Start Original Message -----------
: Does it enough to perform UT after MT with manual cleaning on surface after MT? What i mean, UT still can be performed eventhough the weld surface is not cleaned by power brush.
------------ End Original Message ------------

that should be fine. you will have problems if you ut and then mag. the ut gel will need to be completely removed.


    
 
 
Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1094

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1094
06:33 Jul-11-2007
Re: UT after MT. Surface preparation
It depends on the overall condition of the scan surface(s). If such surfaces were very clean, smooth and free of spatter and other surface irregularities, then the MPI technician will only have needed to apply a very fine and even thickness contrast coating prior to MPI. This would make UT on the painted surface possible if the contast coat is tightly adhering and very thin. However if the surface condition was poor at the time of MPI, then you can expect a much thicker, less even thickness coating - MOPI techs tend to spray contrast coating until it looks a good smooth finish. My general advice would be to power brush the scanning surfaces prior to MPI because this allows the technician(s) more control over both the MPI (thinner more even coating) and the UT ( better probe coupling and manipulation) leading to a higher probability of detection of defects.


----------- Start Original Message -----------
: : Does it enough to perform UT after MT with manual cleaning on surface after MT? What i mean, UT still can be performed eventhough the weld surface is not cleaned by power brush.
: that should be fine. you will have problems if you ut and then mag. the ut gel will need to be completely removed.
------------ End Original Message ------------




    
 
 
chris s
chris s
00:18 Jul-12-2007
Re: UT after MT. Surface preparation
----------- Start Original Message -----------
: It depends on the overall condition of the scan surface(s). If such surfaces were very clean, smooth and free of spatter and other surface irregularities, then the MPI technician will only have needed to apply a very fine and even thickness contrast coating prior to MPI. This would make UT on the painted surface possible if the contast coat is tightly adhering and very thin. However if the surface condition was poor at the time of MPI, then you can expect a much thicker, less even thickness coating - MOPI techs tend to spray contrast coating until it looks a good smooth finish. My general advice would be to power brush the scanning surfaces prior to MPI because this allows the technician(s) more control over both the MPI (thinner more even coating) and the UT ( better probe coupling and manipulation) leading to a higher probability of detection of defects.
:
: : : Does it enough to perform UT after MT with manual cleaning on surface after MT? What imean, UT still can be performed eventhough the weld surface is not cleaned by power brush.
: : that should be fine. you will have problems if you ut and then mag. the ut gel will need to be completely removed.
------------ End Original Message ------------

i did not see any mention of a paint coating



    
 
 
Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1094

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1094
05:33 Jul-13-2007
Re: UT after MT. Surface preparation
chris

If a fluorescent technique not requiring a contrast paint coating is required, then surface condition is even more critical. In nearly all other cases a contrast paint coat is required.

----------- Start Original Message -----------
: : It depends on the overall condition of the scan surface(s). If such surfaces were very clean, smooth and free of spatter and other surface irregularities, then the MPI technician will only have needed to apply a very fine and even thickness contrast coating prior to MPI. This would make UT on the painted surface possible if the contast coat is tightly adhering and very thin. However if the surface condition was poor at the time of MPI, then you can expect a much thicker, less even thickness coating - MOPI techs tend to spray contrast coating until it looks a good smooth finish. My general advice would be to power brush the scanning surfaces prior to MPI because this allows the technician(s) more control over both the MPI (thinner more even coating) and the UT ( better probe coupling and manipulation) leading to a higher probability of detection of defects.
: :
: : : : Does it enough to perform UT after MT with manual cleaning on surface after MT? What i mean, UT still can be performed eventhough the weld surface is not cleaned by power brush.
: : : that should be fine. you will have problems if you ut and then mag. the ut gel will need to be completely removed.
: i did not see any mention of a paint coating
------------ End Original Message ------------




    
 
 
chris s
chris s
08:09 Jul-17-2007
Re: UT after MT. Surface preparation
----------- Start Original Message -----------
are you talking about a developer?

: chris
: If a fluorescent technique not requiring a contrast paint coating is required, then surface condition is even more critical. In nearly all other cases a contrast paint coat is required.
: : : It depends on the overall condition of the scan surface(s). If such surfaces were very clean, smooth and free of spatter and other surface irregularities, then the MPI technician will only have needed to apply a very fine and even thickness contrast coating prior to MPI. This would make UT on the painted surface possible if the contast coat is tightly adhering and very thin. However if the surface condition was poor at the time of MPI, then you can expect a much thicker, less even thickness coating - MOPI techs tend to spray contrast coating until it looks a good smooth finish. My general advice would be to power brush the scanning surfaces prior to MPI because this allows the technician(s) more control over both the MPI (thinner more even coating) and the UT ( better probe coupling and manipulation) leading to a higher probability of detection of defects.
: : :
: : : : : Does it enough to perform UT after MT with manual cleaning on surface after MT? What i mean, UT still can be performed eventhough the weld surface is not cleaned by power brush.
: : : : that should be fine. you will have problems if you ut and then mag. the ut gel will need to be completely removed.
: : i did not see any mention of a paint coating
------------ End Original Message ------------




    
 
 

Product Spotlight

TVC awarded UKAS accreditation

TVC are delighted to finally announce we have been awarded UKAS accreditation for our calibration
...
laboratory. Laboratory accreditation to ISO/IEC 17025:2005 enables us to conduct the Electrical Verification of Ultrasonic Flaw Detection Equipment to BS EN 12668-1:2010. It has taken many months of hard work and we want to thank our staff for all their efforts during this massive undertaking.
>

Ultrasonic Flaw Detector & Thickness Gauge: Smartor

SIUI’s newly launched Smartor is a combination of ultrasonic testing and ultrasonic thickness me
...
asurement. ●IP 66 ●Compact size: 198 (W)* 128 (H) *520 (D) mm ●0.9kg only with battery ●5.7" LCD with high resolution 640×480 pixels ●One-hand operation ●Multiple conventional UT functions ●Smart Test Wizard ●Weld Simulation
>

FD800 Bench Top Flaw Detectors

The bench-top FD800 flaw detector range combines state-of-the-art flaw detection with advanced mater
...
ial thickness capabilities. Designed for use in the laboratory these gauges are the tool you need for all your flaw detecting needs.
>

Trade-In Offer

We are offering our existing clients trade-in against Wavemaker® G3 systems, Standard (Blue) inflat
...
able rings and modules for excellent deals on the latest Wavemaker® G4mini system.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window