Another Weld Symbol question...
Another Weld Symbol question...
(OP)
How do you display the difference between the following welded joints?
- nozzle/shell (CAT D) where the nozzle has the bevel and then fillet weld is applied outside.
- nozzle/shell (CAT D) where the shell has the bevel and then fillet weld is applied outside.
I am concerned about small dia pipe and understand that for VIII Div 1 if you bevel the shell it is not considered small dia (<2 7/8") but if you bevel the pipe it is. Comments?
Thank you in advance,
- nozzle/shell (CAT D) where the nozzle has the bevel and then fillet weld is applied outside.
- nozzle/shell (CAT D) where the shell has the bevel and then fillet weld is applied outside.
I am concerned about small dia pipe and understand that for VIII Div 1 if you bevel the shell it is not considered small dia (<2 7/8") but if you bevel the pipe it is. Comments?
Thank you in advance,





RE: Another Weld Symbol question...
RE: Another Weld Symbol question...
The symbol for the joint you describe wold require a bevel symbol on the reference line with a fillet symbol directly on top of the bevel symbol.
Remember that the bottom of the reference line ALWAYS corresponds to the arrow side of the joint.
RE: Another Weld Symbol question...
RE: Another Weld Symbol question...
RE: Another Weld Symbol question...
thank you for your response. I reread your earlier response describing the symbols and still am a bit confused. I don't have access to AWS A2.4.
Maybe I am not describing the joints good enough:
- both joints will have a full pen groove weld. Both joints will have a fillet on the outside.
One joint will bevel the hole in the shell and the other joint will bevel the nozzle.
All of my reference material for weld symbols don't really address these two different joint configs. Any help you can provide would be greatly appreciated.
Gies
RE: Another Weld Symbol question...
Getting back to the joints you describe, the break, and the arrow pointing to the side that bevels would properly indicate your intentions.
Just to add clarification, the reference line is horizontal, the break would go off of the reference line at an angle, and the arrow would angle from the break to the joint, pointing to the side that bevels.
RE: Another Weld Symbol question...
If I am reading this right, you are looking for a way to differentiate the weld symbol for weld details as illustrated in Fig.UW-16.1 (a) and (d). As you indicated, both are full penn welds; one penetrates the host, the other penetrates the nozzle neck. Whether or not I am right, I have always referred to (a) as a "saddle on" connection. I have also seen it referred to as "set on". As the weld symbol for both is the same, I have historically included the letters "SADD" in the tail of the weld to indicate bevel on the nozzle neck. No message in the tail indicates the host is to be beveled. Again, I may not be right, but all fabricators I have worked for understood and used this terminology. Hope that helps.
RE: Another Weld Symbol question...
SADD is how you indicate to your shop to bevel the nozzle?
As you know, when things get to be less than 2-7/8" small dia quals may come into play depending on what gets beveled.
Thanks for the continued input.
RE: Another Weld Symbol question...
RE: Another Weld Symbol question...
RE: Another Weld Symbol question...
weldtek provides sage advice.
RE: Another Weld Symbol question...
I finally got my head around the arrow break as put forth by weldtek and got a sketch from a colleague that clearly illustrates. Still, the arrow break is ambiguos and your welder will really need to know his stuff to execute properly. I stil think a note in the tail indicating "set on" or "set in" is your best bet.
RE: Another Weld Symbol question...
RE: Another Weld Symbol question...
I have always understood that if you bevel the shell no matter how small the nozzle is, small dia does not come into play; bevel the nozzle and you need to refer to Section IX (above QW-452.3).
Talked with a gentleman from the National Board and he stated that basically, this title tells you what you need to know. By saying diameter limits, it is specifically telling you the set on style (or where the pipe is beveled) falls under this qualification. With a joint in which the shell is beveled you do have a hole but it does not fall under this 'diameter' text.
RE: Another Weld Symbol question...
I concur with your contact at NB.
RE: Another Weld Symbol question...
a groove weld symbol: if on the shell arrow points to the shell, if on the pipe, arrow breaks to the pipe,
Oh I hope to be right on this one!
genb