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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

 
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