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 -

 1622 views
Technical Discussions
Nandesh Kumar A
Nandesh Kumar A
14:21 Feb-28-2010
Can anybody explain me for ISO 13847 ?

One of our code (ISO 13847 ) says the following.

"The total area, when projected radially through the weld, shall not exceed 2% of the projected weld area in the radiograph. The area shall be the length the weld affected by the porosity (with a minimum length of 150 mm ) times the maximum width of the weld."

The above criterion is in order to evaluate porosity on a radiograph. Now I've a uniformly distributed porosity of upto 45 mm length. The total length of the weld is 192 cm (24 inch OD, pipeline )Can anybody explain me (if possible with a sketch) how to proceed with it?

Replies are highly appreciated.

Nandesh Kumar

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

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
15:09 Mar-01-2010
Re: Can anybody explain me for ISO 13847 ?
In Reply to Nandesh Kumar A at 14:21 Feb-28-2010 (Opening).

Nandesh

If the weld length affected by porosity is 45mm, this is less than 150mm and so you must use the default 150mm figure. Multiply this by the maximum width of the weld in the affected region and then multiply by 0,02 (2%). Say the weld width is 25mm: 150mm x 25mm x 0,02 = 75 sq mm. Measure and add together all pore diameters in the affected region, multiply the total by pi. If the calcualted figure is less than your previous calculation (75 sq mm in my example) then the area is accpetable. Greater pore area sum total = rejectable.

Hope this helps

Nandesh
Nandesh
05:33 Mar-02-2010
Re: Can anybody explain me for ISO 13847 ?
In Reply to Nigel Armstrong at 15:09 Mar-01-2010 .

Thanks Nigel...but can ypu please explain me whats the terms " projected radially" and " projected weld area " in my post?
Regards,

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

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
06:34 Mar-02-2010
Re: Can anybody explain me for ISO 13847 ?
In Reply to Nandesh at 05:33 Mar-02-2010 .

Nandesh

The use of "projected" radially and weld area is to maintain proportionality with regard to image magnification. If the set-up used has a low ratio between source-to-object distance and material thickness, differential magnification will enlarge a source-side pore more than a film-side pore.

Assuming you used a panoramic exposure on a 24" sch 40 pipe (wt = 0,375") then differential magnification is not a problem you need worry about.

Hope that helps

Nigel

13:08 Feb-08-2014
Re: Can anybody explain me for ISO 13847 ?
In Reply to Nigel Armstrong at 15:09 Mar-01-2010 .

"The distribution of scattered porosity is such that when projected radially through the weld the total area of porosity exceeds 1% of any 600mm Sq of projected weld metal."

Product Spotlight

#### A1525 SOLO

A1525 Solo – the most compact and affordable TMF unit with two phased array transducers and 3D v
...
isualization and analysis software in standard delivery set. A compact, ergonomic and easy to handheld Phased Array unit based on Total Focusing Method for easy-going imaging of inspection objects with two-dimensional and three-dimensional visualization and evaluation of inspection results.
>

#### IRIS 9000Plus - Introducing the next generation of heat exchanger inspection.

Representing the seventh generation of the IRIS system, the IRIS 9000 Plus has nearly 200 years of c
...
ombined field inspection experience incorporated in its design. This experience combined with a strong commitment to quality and a history of innovation has made Iris Inspection Services® the undisputed leader in IRIS technology.
>

#### 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.
>

#### 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.
>

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