There is some confusion at my office as to the definition of the all around weld symbol.  I have not been able to find a satisfactory answer online.  Here is the question....

When two plates (one much smaller than the other )are welded together such that the large flat areas of the plates are in contact and the smaller plate overhangs the larger one, does the all around symbol imply that weld is wrapped around the smaller plate on the back side?  See picture for illustration.  

If one looks at the attached picture and please excuse the powerpoint drafting....does the all around weld symbol imply that the dashed line is welded?  

thanks in advance

That's how I interpret the all around symbol, meaning to weld all sides of the joint (even a lap joint).

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I agree with MM.  It is an "all" around symbol, not a partially around symbol.  If it were a partially around weld, you would not use that symbol.  

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In the case shown in your print, I would say yes it means all 4 sides. However if the vertical edges of the two plates were coplanar, it would not mean all 4 sides because one side would need to be a seam weld and not a fillet.  

David

It may be technically correct but I would not use it in this situation, because it is easily misinterpreted.  Take the extra 8.4 seconds to add additional weld symbols for clarity.

I prefer to restrict all-around to joints like tubes butting onto plates, where the meaning is clear.

Good point, Tick.  It is never a good idea to introduce ambiguity to a drawing.  If in doubt, spell it out.

When the people fear their government, there is tyranny; when the government fears the people, there is liberty. - Thomas Jefferson
 

Agree with eliminating ambiguity.  So, maybe turn the fillet symbol around...?:)

Dan  

This can be interpreted by different welders. To make it clear, possibly add the weld symbol to all 3 edges and not use 'all around'. If you want the underside welded, show a bottom view with another weld symbol. They both may be two different setups anyway.

Chris
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Agree that this means weld all around including the reverse side but it could be misinterpreted. Also as Dan says, your fillet weld symbol is backwards.
The symbol is always the same, regardless of what side the arrow is on.