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 -
748 views
Technical Discussions
Muthukumaran
Muthukumaran
08:45 Apr-12-2017
Weld defects

What are the differences between porosity and gas pore in weld defects? What are the significant technical differences? Please kindly share your suggestions.

 
 Reply 
 
Rick Lopez
R & D,
John Deere - Moline Technology Innovation Center, USA, Joined Jul 2011, 188

Rick Lopez

R & D,
John Deere - Moline Technology Innovation Center,
USA,
Joined Jul 2011
188
15:30 Apr-12-2017
Re: Weld defects
In Reply to Muthukumaran at 08:45 Apr-12-2017 (Opening).

Muthukumaran,
Some context on the reason behind your question would be helpful. In my mind they are essentially the same type of flaw - the only potential difference being "porosity" is likely considered a cluster of smaller gas-filled voids, while "gas pore" may have been used to describe a single isolated gas-filled void.

In my opinion, the terminology in industrial applications where NDT is used is often a source of confusion. Castings are a good example (although not the subject of your question). If you have a movement/loss of sand in the cope of a sand casting, then that is often called a "scab" (but may also be called a "sag" or a "drop" depending on the book you reference). What is a "buckle" or a "rat-tail" you might wonder - well those are less-severe versions of scabs that don't yet merit that name.

 
 Reply 
 
Hamid Reza
,
Canada, Joined Oct 2016, 68

Hamid Reza

,
Canada,
Joined Oct 2016
68
08:59 Apr-14-2017
Re: Weld defects
In Reply to Muthukumaran at 08:45 Apr-12-2017 (Opening).

Dear Muthukumaran,

According to ISO 6520-1:2017, Welding and allied processes — Classification of geometric imperfections
in metallic materials — Part 1: Fusion welding
Page 8:

Gas Pore: gas cavity of essentially spherical form.

There are about 18 types of porosities listed in that document. I have attached a summary here.

I read somewhere (in a textbook) that categorized gas pores as spherical porosities with diameter smaller than 1.5mm. But so far, I was not able to find it.

 
 Reply 
 
Hamid Reza
,
Canada, Joined Oct 2016, 68

Hamid Reza

,
Canada,
Joined Oct 2016
68
09:00 Apr-14-2017
Re: Weld defects
In Reply to Hamid Reza at 08:59 Apr-14-2017 .

zoom image


Porosities

 
 Reply 
 

Product Spotlight

UCI Hardness Tester NOVOTEST T-U2

UCI hardness tester NOVOTEST T-U2 is is used for non-destructive hardness testing of: metals and
...
alloys by scales of hardness: Rockwell (HRC), Brinell (HB), Vickers (HV); non-ferrous metals, alloys of iron etc., and using five additional scales for calibration; with tensile strength (Rm) scale determines the tensile strength of carbon steel pearlitic products by automatic recalculation from Brinell (HB) hardness scale.
>

Semi-Automated Phased Array Immersion System for Small Composite Parts

Turn-key semi-automated system as an improved and affordable solution for inspection of small comp
...
osite parts. Includes support table, immersion tank, scanner, PA instrument, PC, Analysis software, database, wedge management and other options.
>

FMC/TFM

Next generation for Phased Array UT is here now with FMC/TFM! Have higher resolution imaging, impr
...
oved signal to noise ratio, characterize, size and analyze defects better with access to several wave mode views and save raw FMC data for higher quality analysis.  Some of the benefits are:
  • Beautiful Image! Easier to understand what you're looking at
  • Completely focused in entire image or volume
  • Much easier to define setups before inspection
  • Easier to decipher geometry echoes from real defects
  • Oriented defects (e.g. cracks) are imaged better
  • See image from different wave modes from one FMC inspection
  • FMC data can be reprocessed/analyzed without going back to the field
>

TraiNDE UT

TraiNDE UT is a virtual tool associated with a signal database which simulates real inspection con
...
ditions for numerous applications (Type A/V1 block, DAC block, welds and plates).
>

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