weld symbols 2

[hapunaterp]

For some reason I have in my head that I learned the following: when calling out a fillet weld you don't need to put the triangle and fillet size on the top and bottom because if it is on the bottom only and there are two sides then it is 'understood' that you mean both sides.
i cannot find supporting evidence of this in anything i read so although I have been told this, I am not sure the information is correct.
Does this sound familiar to anyone else and is it true?
thank you -

 

[Lomarandil]

I've seen that assumed for the fillet weld size, but I would definitely show the fillet weld "triangle" symbol on whatever sides I intended to have weld.

----
The name is a long story -- just call me Lo.

 

[JLNJ]

If there is no triangle on top, then you are asking for a one-sided weld. If you want fillet welds on both sides of the joint, you need two triangles.

Traditionally, you haven't needed to duplicate the size callout on the "other" side, but AISC is now saying that if you don't call out a weld size, you are asking for the minimum weld size permitted.

 

[dik]

You show both 'triangles', but you don't have to repeat the text...

Dik

 

[msquared48]

Triangles both sides for welding on both sides, or you can just show the all around symbol if it applies correctly.

Mike McCann, PE, SE (WA)

 

[Nor Cal SE]

I agree with all other posts and especially JLNJ's statement of why it is good to include the fractional thickness number on both triangles, presuming you want something more than the minimum. For the very small time it takes to write that additional number, you could save yourself much quibbling with a contractor/fabricator.

 

[nutte]

AWS says you're supposed to show the weld size on both sides. Weld size and triangle on one side, blank triangle on the other is common, but it is not technically correct. It used to be, I think many years ago, but it's not currently.

 

[hapunaterp]

Much appreciated. All good information.

 

[dik]

Thanks nutte... will change my ways... I've always shown it on the near face...

Dik

 

[weab]

I'm guessing that Dik is an older codger like me. Once upon a time, AWS would allow a double fillet call out with the bottom (near) only size callout which would be understood to be the same on both sides. Both sides would only be called out if they were not the same. Somewhere along the way, AWS changed things, but didn't highly publicize it. (No internet at the time.) An AWS manual from perhaps the 80's might bear this out.

I learned from my boss at the time who was probably telling me the wrong thing because he had learned the old way. When I found out the correct way, I was shocked to find out that the change was made many years earlier.

 

[MacGruber22]

As mentioned, these days not putting a throat or weld size in front of the symbol technically means you are only asking for the minimum AWS weld. I suspect not many in the structural world interpret that in the same way, but it isn't that much work to put the text on either side.

I also see people calling for CJP groove welds by only showing the groove symbol and nothing else. Need to have "CJP" on the tail to be clear there too.

Call me "Mac"