Partial Pen Groove Weld
Partial Pen Groove Weld
(OP)
Do you call out the size and angle on a partial pen groove weld?
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RE: Partial Pen Groove Weld
RE: Partial Pen Groove Weld
RE: Partial Pen Groove Weld
Note: Your plate thickness must be adequate to provide the minimum root face. It is less expensive to increase the plate thickness and use a partial pen, then to revert to CJP weld of the thinner material.
I can be more specific if you describe the joint.
http://www.FerrellEngineering.com
RE: Partial Pen Groove Weld
The engineer designing the connection should provide the AWS weld designation and specific information if necessary. If the engineer does not know this information, how will the detailer or welder? The short-cut is showing CJP or PJP
This is a general rule...
For example a CJP, TC-U4a, is typically a field weld with backing for flange welded moment connections. This information is very helpful to the weld inspector when verifying the welding procedure and qualifications. The specific detail, groove angle, root opening, may be a fabricator or erector preference, but should be detailed on the erection drawings for future inspection and verification of erection fit-up.
I frequently see design drawings with a bevel groove weld symbol and nothing more. This wisdom is continued on the shop drawings and erection drawing. Is the intent CJP, or PJP with ??? effective weld? You know what (ass)(u)(me)ing does for us. Do you really want the iron worker to be the first person to recognize that more information is needed. If you really need a CJP weld for strength, do you want to try and determine if an AWS procedure was used after the welding is complete.
I have seen a million welder short-cuts made with WPS in hand. But, at least they were aware that a procedure is expected.
Sorry, ToadJones I am rambling...
http://www.FerrellEngineering.com
RE: Partial Pen Groove Weld
Actually, I'm glad to read your rambles.
What I have is a very small wideflange in tension welded to an endplate.
I want to simply use a fillet all around, but the top of the wideflange must be flush with the top of the endplate. So, I plan to call out a fillet all around except along the top where i was going to use a partial pen.
Somehow, I seem to have run into this exact situation a lot over the last few years.
RE: Partial Pen Groove Weld
I admit, like a lot of engineers, I am lacking in knowledge exact weld processes and terminology....like TC-U4a...if I see that, I have to look it up everytime
RE: Partial Pen Groove Weld
RE: Partial Pen Groove Weld
You have a BTC-P4. You can convert the 2-sided fillet to a partial pen.
SEE ATTACHED - Hope this helps.
I do understand that AWS requirements and weld designations can be an additional headache. Between the engineer (EOR or connection engineer), fabricator, and erector these requirements should be clearly defined on the shop drawings and erection drawings. IMHO Just another reason the EOR should require a licensed connection engineer. Someone who understands the force/design requirements and the fabrication erection issues.
http://www.FerrellEngineering.com
RE: Partial Pen Groove Weld
That is what i called out "BTC-P4"
Thank you for the conversion....I really appreciate that.
why is there a need to put both the size and effective size on the weld call out?
RE: Partial Pen Groove Weld
Regretfully, in your case a CJP (TC-U4b, shop weld with backguoge) may be required.
If the weld strength required is greater than 5.25 k/in. the flange is not thick enough for a partial pen.
At 5.25 k/in. the (E) effective weld size is 1/4.
S = 1/4 + 1/8
min PL = S + 1/8 = 1/2
BUT, in the proper position with FCAW/GMAW (wire feed) you could use BTC-P4-GF. S = E = 1/4, and min thickness would be 3/8"
http://www.FerrellEngineering.com
RE: Partial Pen Groove Weld
This is not for a lot of connections....just one big bracket.
When sizing the welds, a 1/4" fillet weld on the effective tension area (like a tension base plate design) was was sufficient.
This will be made in the field by our own welders so cost is really not a concern, at all.
RE: Partial Pen Groove Weld
http://www.FerrellEngineering.com
RE: Partial Pen Groove Weld
on your sketch....you call out no angle, does the welder assume a 45º angle?
RE: Partial Pen Groove Weld
http://www.FerrellEngineering.com
RE: Partial Pen Groove Weld
Byu the way, why the hell is it called out BTC = Butt-Tee-corner...why use all?
RE: Partial Pen Groove Weld
For PJP welds the information missing from the WPS is the effective weld size. If the welder knows the "E" he can determine the rest of the information from the WPS.
The reason I believe this information should be clearly shown on the shop drawings and erection drawings. Is that the WPS is not provided to the CNC operator or other non-welders in the shop. With some of the new CNC equipment, the beam line will prep the flanges and cut the access holes. The welder walks up to a piece ready for welding, he verifies the fit-up, cleans the surface, and starts welding.
I do understand the simplicity of CJP for the engineer. But, this a much more expensive process. Especially when joint details are repeated.
http://www.FerrellEngineering.com
RE: Partial Pen Groove Weld
Call me
We can discuss this in better detail.
(205)879-2036 ext 102
http://www.FerrellEngineering.com
RE: Partial Pen Groove Weld
http://www.FerrellEngineering.com
RE: Partial Pen Groove Weld
Connect- you've been more than helpful and I dont want to waste anymore of your time.
To be quite honest, I am embarrassed to ask for some of these clarifications. I have been doing this long enough that I really should know better. But, as a design engineer doing mostly structural analysis on steel structures and foundations and only lately doing my own detailing as well, I have just recently gotten more involved in more detailed weld call-outs.
Thank you
RE: Partial Pen Groove Weld
you are right...i have heard the same joke or one-liner "use a CJP" a million in times over my short career.
RE: Partial Pen Groove Weld
RE: Partial Pen Groove Weld