Injones,
Welcome to the AWS Forum!
It's good to see new people coming to this forum.
I'm having problems picturing what you describe as square tube to tube joint (closed corner joint?).
Get yourself a copy of AWS A2.4 Standard Symbols for Welding, Brazing and Nondestructive Examination. Familiarize yourself with the weld symbols and terminology.
It's good that you are going onto the shop floor to ask questions. You learn a lot that way.
You are putting on weld symbols which speaks to the minimum strength requirement of the weld joint to carry the load. Does the Design Engineer review your drawings before release?
Tyrone
By Steelslinger
Date 09-25-2017 18:49
Edited 09-25-2017 18:52
If the Tubes are matched in size (Ex. 4 x 4 x 1/4 to another 4 x 4 x 1/4) you would have two Inside Corner/T-Joint Fillets and two Butt Joint Flare Bevel PJPs. You would not be able to use the 'All Around' symbol, as it is not a single type of weld. You would have to call out each type of weld joint, perhaps adding 'TYP' in the tail so you would not have to mark each face of the tube.
If they are unmatched in size (4 x 4 x 1/4 end to the side wall of a 6 x 6 x 1/4), then you would have a 'All Around' Fillet.
We create a print wide Detail Drawing of the joint with weld symbols, then mark it as typical for this type of connection. That helps cutting down on muddying up the print with weld symbols.
Injones,
WELDCOME TO THE AWS WELDING FORUM, The Greatest Welding Forum In The World, Bar None.
An interesting and very applicable query to start off your relationship here.
Now, part of your answer will also be dependent upon your applicable code. It appears from your materials and examples that D1.1 is at play here??
When you combine the requirements of D1.1 with the specifics of A2.4 Welding Symbols, you will find that the previous post of Steelslinger is very good.
A smaller size HSS to HSS CAN be called as an all around fillet weld, IF, it is needed and/or required for said fillet weld to wrap the corners. Most of the time it is not when it comes to structural steel.
Size on Size HSS will have two fillets and two PJP Flare Bevel Groove welds. Thus, the welder must be qualified for CJP's not just fillets and you have another issue with the corners.
As previously mentioned, the corners are generally not required to be welded. Just as going around the corner on a stiffener plate or other applications, this area is generally left unwelded. There are a couple of reasons: many shops use an electrode that is not qualified out of position and this weld will be out of position unless the part is stood up on end. Seldom done in the shop. Most shop welders are not qualified for out of position even if the electrode is. Next is the idea that you have 4 separate welds called. Especially with code allowed holdbacks and other code issues, the four welds need not connect and in many cases are better off not connecting.
One time when it will be welded is for sealing for some paints and/or galvanizing.
Read carefully your application of the code and A2.4 when it comes to calling out the flare bevel groove welds. Weld size is very important especially on larger members where it is quite possible the weld does not need to be of a size that would bring it all the way out to flush condition which will be required if you don't give them a weld size.
He Is In Control, Have a Great Day, Brent