Proper weld symbol/end prep for full pen. butt weld of threaded rod

[brandonl]

If I wish to specify that a 3/4" diameter A307 threaded rod be butt welded to a flat plate or beam flange using a full penetration weld:

1. Is a weld symbol required, or would simply stating with a plan note that a fiull penetration weld be used be adequate?

2. If a weld symbol is not required, what type of end treatment should the welder perform on the end of the rod in order to properly complete the full pen weld?

3. If a weld symbol is required, what would be the proper symbol (or where might I look to find the proper symbol)?

4. What are the specifications/codes/publications that address such welding?

 

[CWIC]

1.) A welding symbol would be required to inform the welder as to what type of joint preparation/weld is needed.

2.) See number 1.

3.) There are several options although a single or double bevel are two options.

4.) AWS A2.4-98 Standard Symbols for Welding, Brazing and Nondestructive Examination

 

[brandonl]

Thank you CWIC for your quick reply. Just to clarify a few things: So the welder is not expected to know what types of end treatments are appropriate, rather the drawings must include this information in the form of a weld symbol?

Also, in the prequalified complete joint penetration groove welds shown in the AWS D1.1, can it be assumed that the details shown would apply to circular rod as well as flat material (i.e. when referring to the material thicknesses and the end preparation)? In other words, if the end preparation shown is to bevel or chamfer the end, then for a circular rod, this would translate to preparing the end of the rod as a truncated cone shape (i.e., beveling or chamfering around the circumference of the rod), and the material thickness limitations, etc,. apply as written.

Thanks again.

 

[CWIC]

brandonl:
The welder will perform the weld and prepare the joint as detailed in the welding symbol. Expecting the welder to figure this out for themselves can lead to just about anything...

Tapering the rod to a conical end would make welding the rod very difficult for the welder. This is why I mentioned beveling (although your idea is that of a bevel as well.) Basically you can prepare (bevel) the end of the rod to approximately 0.5D, the weld is performed on one side then backgouged on the other side of the joint and welded out (2 welds are performed.)

A single bevel can be used but distortion becomes more of a concern without preloading (angling) the rod to compensate for the weld contraction.

 

[unclesyd]

CWIC,
Do they still make a welding end for threaded rod?
I seen them used both with manual and stud welding guns.

 

[CWIC]

unclesyd/brandonl:
That is a very good idea if the parts invloved are such that the SW process could be implemeted (provided there are enough units and that the part geometry makes the process practical.)

If it's just a few, then arc welding the rods would be the most common process, if there are many, then ubnclesyd's SW process would definitely be the way to go. Custom-threaded studs are readily available.

 

[brandonl]

What would be "many". There would be about 100 to 150 in this application.

So there are weldable studs available that are threaded? From where?

 

[unclesyd]

Here is website with a lot of the types available. Your consumables supplier should be able to get any type and you can rent a stud welding gun.

http://www.sunbeltstudwelding.com/weldstuds.htm

 

[unclesyd]

For got to add that some of these are for arc welding.
You are getting into the range that a stud gun, which can be rented, would save a lot of time and money. Your can get them from these eople our your consumables supplier can get them.

 

[brandonl]

Ok - the studs seem like a good option. Thanks for the link and the info. Can studs be welded via a gun onto a vertical surface, or does it have to be on a horizontal surface?

There is still one question that hasn't been answered. And let's forget for a minute that this might not be the best way to do it, but what is the proper end prep for welding a threaded rod to a flat surface? Would it be to shape the end into a truncated cone? Or to do a single or double bevel? Or are both appropriate?