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 -

4767 views
Technical Discussions
Tom
Tom
09:50 Aug-14-2007
Elliptical Shots

Does anyone know a general rule of thumb as to how much of an offset you should use to radiograph a 2" joint using an elliptical exposure?


    
 
 
Dent
Consultant, NDE Manager NDELevel III/3
NDT Consultant, Canada, Joined Nov 1998, 248

Dent

Consultant, NDE Manager NDELevel III/3
NDT Consultant,
Canada,
Joined Nov 1998
248
05:10 Aug-14-2007
Re: Elliptical Shots
----------- Start Original Message -----------
: Does anyone know a general rule of thumb as to how much of an offset you should use to radiograph a 2" joint using an elliptical exposure?
------------ End Original Message ------------

15 Deg should work.


    
 
 
DJ Kallhof
DJ Kallhof
08:38 Aug-14-2007
Re: Elliptical Shots
----------- Start Original Message -----------
: : Does anyone know a general rule of thumb as to how much of an offset you should use to radiograph a 2" joint using an elliptical exposure?
: 15 Deg should work.
------------ End Original Message ------------

7 : 1 ratio has worked well for me in the past. Back off 14" and offset 2" or 21" and offset 3". You get the idea. The only thing that can make it tricky is excessive weld build up of the root or crown. Take a technique and adjust accordingly.



    
 
 
chris s
chris s
00:44 Aug-15-2007
Re: Elliptical Shots
----------- Start Original Message -----------
: : : Does anyone know a general rule of thumb as to how much of an offset you should use to radiograph a 2" joint using an elliptical exposure?
: : 15 Deg should work.
: 7 : 1 ratio has worked well for me in the past. Back off 14" and offset 2" or 21" and offset 3". You get the idea. The only thing that can make it tricky is excessive weld build up of the root or crown. Take a technique and adjust accordingly.
------------ End Original Message ------------

i use the 7:1 ratio also, works fine. until you get into heavy wall


    
 
 
G.Madhesan
G.Madhesan
01:44 Aug-22-2007
Re: Elliptical Shots
As said by Mr.Dent You can use a 7:1 technique but you have to consider the thickness of the pipe because the root will vary deponds upon the wall thick.


    
 
 

Product Spotlight

Magnetic X-Ray Pipeline Crawler

Zhong Yi brand pipeline crawler is magnetic/micro-video controlled crawler with DC X ray unit inst
...
alled for checking welding of pipeline. Move steadily inside the pipeline 6''-60''diameter with speed of up to 18m/min, Max. moving diatance 5 kilometers and provide the efficient inspection of the pipeline.
>

Robotic laser shearography enables 100% inspection of complex, flight-critical composite structures

An article in “Composites World Magazine” showcases Non Destructive Testing of aero-structures
...
with Laser Shearography. Over the years Dantec Dynamics has supplied many solutions for the aerospace industry. Referring to specific customer projects several of these cases are examined to outline the advantages of using Laser Shearography for automated defect detection.
>

NOVO Armor 15 & NOVO Armor 22

The Armor Kit Contains the NOVO Armor, which provides additional mechanical protection to the NOVO 1
...
5WN & NOVO 22WN Detectors, the Armor Stand and a traveling soft cover. - Newest shock absorbent technology case - Water resistant design - Supports wired & wireless communication - Multiple positioning options - Tripod connection using the Built-in 1/4” threads - Simple Detector battery replacement
>

Compact NDT inspection-heads for measurements with active thermography

The compact inspection head is suitable for thermographic ndt tasks. The uncooled infrared camera
...
is specially developed for NDI-tasks and offers a thermal sensitivity until now known only from thermal imagers with cooled detector. All required components and functions are integrated into the inspection-head. You will only need an ethernet cable to connect the sensor with the evaluation 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