Welding plate to pipe

[RFreund]

What is the appropriate weld category/name/symbol for welding a steel channel (or plate) to a 3" diameter column? Or any large diameter section with a plate welded to it. In cross section, the plate width is tangent to the radius (thickness is parallel to column thickness).

Like this: o[

Would this be flare-bevel-groove weld? (this is what I would use if it were a small diameter and effective throat being a=5/8*R). How is the effective throat determined?

Thanks


EIT

 

[Duwe6]

Indeed it is a flare-bevel. I would figure effective throat experimentally -- "ask the weld". Mock-up the joint, then section it. Start with the smallest size face-of-weld you would guess will give you the necessary throat. When you [just] get the needed throat size, now you have the minimum 'face' size to inspect to.

Actual pennetration will vary with process, so a mockup using SMAW 'stick' will not translate to GMAW or GTAW.

 

[connectegr]

Depends on the condition...

SEE sketch

The welding required for a flare bevel groove may be unreasonable. For a small gap (< 3/16) a fillet weld can be increased accordingly.

http://www.FerrellEngineering.com

 

[DVWE]

RFreund,

Are you working with AWS D1.1? I'm assuming that's where the 5/8R stipulation comes from?

 

[connectegr]

From D1.1, a BTC-P10 is the closest example. But, E = 5/8(t) is a geometric limit as shown. In the case of a pipe the radius is considerably larger, thus the maximum E and actual weld size must be determined. Z-loss must be considered in the acute angle. Theoretically a loss of at least 1/8" at the root of the weld. This is because within close proximity to the corner the weld arc will strike, without infusing metal the entire depth. From this depth an effective weld "E" can be determined, but is limited is size by the diameter of the pipe. Since E can only be observed in cross section, a "weld dimension" should be provided for external measurement. This information is most easily determined and shared in a scaled cross section detail of the intended weld.

http://www.FerrellEngineering.com

 

[RFreund]

Thanks guys.

I was actually referring to AISC but I beleive they refer to AWS D1.1 in regards to the 5/8R.




EIT

 

[connectegr]

AISC does refer to D1.1 and especially in these cases.

http://www.FerrellEngineering.com