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European Weld Callouts - Confused with the "/C" and the "a2" portions
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European Weld Callouts - Confused with the "/C" and the "a2" portions
European Weld Callouts - Confused with the "/C" and the "a2" portions
European Weld Callouts - Confused with the "/C" and the "a2" portions
European Weld Callouts - Confused with the "/C" and the "a2" portions
European Weld Callouts - Confused with the "/C" and the "a2" portions
European Weld Callouts - Confused with the "/C" and the "a2" portions
European Weld Callouts - Confused with the "/C" and the "a2" portions
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print (drawing) callouts, welding
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  Post Number #1  
Old 15th January 2018, 11:39 AM
Emmyd's Avatar
Emmyd

 
 
Total Posts: 19
Please Help! European Weld Callouts - Confused with the "/C" and the "a2" portions

Hi Covers!

I need some help with some European weld callouts. I used to have a link that was very good at explaining the callouts, but I no longer have it and can't find it with searches.

I've attached a photo of the part in question - it is a flat plate with a large nut that is to be welded - 2 callouts are listed for the same feature: a fillet weld and a projection weld. I know the symbols for the fillet & projection weld, and the "23" & "141". I'm more confused with the "/C" and the "a2" portions. Can someone please help?

Thanks in advance!
Em
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European Weld Callouts - Confused with the "/C" and the "a2" portions-weld-callout-question-jpg  

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  Post Number #2  
Old 15th January 2018, 01:18 PM
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Miner

 
 
Total Posts: 4,187
Look! re: European Weld Callouts - Confused with the "/C" and the "a2" portions

I think I found the a2 reference in this link as referring to a dimension for the fillet.

The 23/C and 141/C in the prior link as well as this link refer to 23 = projection weld, 141 = TIG weld and the /C as the welding class. I could not find any details on the welding class.
Thank You to Miner for your informative Post and/or Attachment!
  Post Number #3  
Old 15th January 2018, 01:20 PM
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Emmyd

 
 
Total Posts: 19
re: European Weld Callouts - Confused with the "/C" and the "a2" portions

Thanks, Miner. I did find the classes in my search - the C class is for non critical welds.

I appreciate the feedback!
Em
  Post Number #4  
Old 15th January 2018, 02:06 PM
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Marc

 
 
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Re: European Weld Callouts - Confused with the "/C" and the "a2" portions

Quote:
In Reply to Parent Post by Emmyd View Post

Thanks, Miner. I did find the classes in my search
Where did you find them?
  Post Number #5  
Old 15th January 2018, 02:10 PM
Emmyd's Avatar
Emmyd

 
 
Total Posts: 19
Re: European Weld Callouts - Confused with the "/C" and the "a2" portions

Quote:
In Reply to Parent Post by Marc View Post

Where did you find them?
Here's where I found the classifications.
Definition of Class A,B,C Welds / General Welding Discussions / Weekend Warriors Welding Forum
Thanks to Emmyd for your informative Post and/or Attachment!
  Post Number #6  
Old 15th January 2018, 02:27 PM
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Marc

 
 
Total Posts: 26,292
Re: European Weld Callouts - Confused with the "/C" and the "a2" portions

Thanks - That may help folks with future welding questions.
Thanks to Marc for your informative Post and/or Attachment!
  Post Number #7  
Old 15th January 2018, 02:50 PM
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Al Rosen

 
 
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Re: European Weld Callouts - Confused with the "/C" and the "a2" portions

I'd be careful accepting those definitions, without reference to the primary source. Here is another explanation for welding class.
Quote:
Weld Classifications

One of the most comprehensive sources for designing welded structures is British Standard BS 7608 "Code of practice for Fatigue design and assessment of steel structures". It provides standard SN curves for welds.
Quote:
The curves shown above are valid for structural steel welds.
Look at

Last edited by Al Rosen; 15th January 2018 at 02:57 PM.
Thanks to Al Rosen for your informative Post and/or Attachment!
  Post Number #8  
Old 15th January 2018, 02:57 PM
Emmyd's Avatar
Emmyd

 
 
Total Posts: 19
Re: European Weld Callouts - Confused with the "/C" and the "a2" portions

Quote:
In Reply to Parent Post by Al Rosen View Post

I'd be careful accepting those definitions, without reference to the primary source.
Good point. I can definitely see the difference between structural welds and the kind of weld I asked about. This particular weld on the picture I shared is not a critical weld - usually we only projection weld nuts like this as the function is to only hold the nut long enough to torque the mating bolt in place. The unusual part of this print is that it calls out 2 different welding methods for the same nut.
I do agree that it is always a good thing to check the primary source.

Thanks!
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