Welding Threaded Rod to Plate 4

[StructTaco]

Is it possible to weld ASTM A193 Gr B threaded rod to A36 plate?

Thanks

 

[Ron]

Whioh Grade B? There are several and each has different properties.

In general the materials are weldable, but you might have to follow pre-heat and post-heat procedures to control thermal response. Grade B7 is quenched and tempered, so you might not want to weld on that, depending on your application.

Also, there's a big strength difference between A193 and A36..you might want to consider that in your application.

 

[metengr]

StructTaco;
For ASTM A193 material specification there is no Grade B material. Go back and check for the number after B, like B5 or B7, etc.

 

[CoryPad]

There are 43 grades that start with B in ASTM A 193, so you should be more specific. In general, you shouldn't weld these materials because of the reduction in mechanical properties and corrosion resistance.

 

[StructTaco]

I was looking at A193 Gr B7, but I only need A307 grade.

OK, how about A307/A36 threaded rod, is it weldable? If not does anyone know of any threaded rod that is weldable?

Thanks very much for responses. Corrosion will not be a problem, interior exposure and it can be painted or cold galvanized.

I need to attach a 1" diameter threaded rod to a 3/4" A36 plate with 15k of tension. I was going to spec. E70XX and a butt weld in order to develop the strength of the rod.

Thanks in advance.

 

[paddingtongreen]

A307 or A36 is good. E70xx is the matching weld material for A36.

Timing has a lot to do with the outcome of a rain dance.

 

[Mr168]

You may want to consider threading the rod into the plate and following up with an appropriately sized fillet weld.

 

[Ron]

agree with Mr168...that shares the stress with the plate and the weld.

 

[StructTaco]

Thanks everyone, very helpful!

 

[MikeMet]

One thing to consider is the fatigue issue that is created if your installation is in a cantalever configuration or if vibration is common. There is already an issue with fatigue starting at the root of a fillet weld. A fillet weld on threaded rod has the added effect of adding stress to the inherent stress concentrations at the root of the threads. There have been many documented failures of back or seal welded threaded fittings failing due to fatigue at the root of the thread next to the seal weld. You should consider making the transition through the toe of the fillet weld as smooth as possible, to the point of even grinding away the threads or shot peening.

 

[unclesyd]

You can mitigate some of the problem mentioned by MikeMet by sticking the rod through the plate a short distance and making a small weldon the backside.

 

[ColonelSanders83]

Why don't you use a shot stud? They come in all shapes and sizex

 

[StructTaco]

This is to attach a threaded rod for a holdown in a shearwall from a factory built/prefab house to a site built foundation. Vibration shouldn't be a problem, and I'll spec that the rod be threaded into the plate, then welded to the plate.

 

[unclesyd]

You might want to look at the Williams Brochures

http://www.williamsform.com/

 

[Tmoose]

I'd weld a threaded coupling nut to the plate after I ground the zinc plating off. Probably already have a box of them if you are working with threaded rod.

McMaster-Carr
90264A260
Grade 2 Zinc-Plated Steel Coupling Nut 1"-8 Thread Size, 2-3/4" Length, 1-3/8" Width
In stock
Quantity Each
1-9 Each $4.90

Might use the kind with a hole part way down to confirm the thread engagement is adequate.
93525A329
Zinc-Plated Steel Coupling Nut W/Sight Hole 1"-8 Thread Size, 3" Length, 1-1/2" Width
In stock
Quantity Each
1-9 Each $12.57