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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.


 
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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.


 
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Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
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 ------------




 
 Reply 
 
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



 
 Reply 
 
Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
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 ------------




 
 Reply 
 
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 ------------




 
 Reply 
 

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