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Up Topic Welding Industry / General Welding Discussion / Abreviation in tail of welding symbol. Picture attached
- - By strother (***) Date 02-13-2014 18:15 Edited 02-13-2014 18:43
I am trying to decipher two abbr. in the tail section of two seperate welding symbols on structural steel shop drawings . One is BTC - P10.  The other is TC - U4a .

Picture posted. I know what the rest of the symbols mean but I'm not sure about the tail.
Attachment: welding.jpg (884k)
Parent - - By Think Positive (*) Date 02-13-2014 18:21
Do you have access to a copy of the AWS D1.1 Code Book?

At first blush, my hunch is that the note is referring to the weld joint design details - such as bevel, or U groove, or j groove, and so on with their respective dims. and tols.

Anyone else care to comment?  I don't have access to a copy of the code right now.
Parent - By strother (***) Date 02-13-2014 18:47
I don't have a D1.1 book but I was thinking the same thing . There is a detail of the joint on one drawing its pretty straight forward but I want to be sure I'm not missing something.
Parent - - By jwright650 (*****) Date 02-13-2014 21:59
TC-U4a is a full penetration joint using a backing bar
BTC-P10 is a partial pentration joint

As the others have stated, they are shown the the prequalified joints in Clause 3 of D1.1
Parent - - By strother (***) Date 02-13-2014 22:20
Thanks that was the info I needed . The detail (which is not in the pic] shows backing bars on all for sides of of the horz. tube but backing does not go into the corners. The weld symbols in the pic I attached do not specify length of weld and do not show weld all around . So should I wrap the corners or leave them open?
Parent - By ctacker (****) Date 02-14-2014 01:58
That would be a question for the EOR. Clause 5.10 may give you some guidance also.
Parent - - By jwright650 (*****) Date 02-15-2014 17:18
I've seen cases where the EOR allowed only the flat portions of the joint and ignored the corners(TS radius).

However, If it were done in my shop, I would like to see one of the following:

-A continuous 1/4x1 flat bar bent and fitted around the inside of the 45* beveled TS16x6x1/4(be sure to full pen the joint in the backing bar so that it is continuous), leaving 1/4" outside to give you a 1/4" root opening.

-A 1/2" or thicker plate cut and ground to fit snuggly 1/4"(depending on plate thickness used) up inside the 45* beveled TS12x6x1/4 leaving a 1/4" root opening.
Parent - By ctacker (****) Date 02-15-2014 17:51
There are exceptions to having a continuous backing in statically loaded applications. See clause 5.10.2, D1.1-2010
Parent - By strother (***) Date 02-18-2014 01:31
John,
   Thanks for your help. I will ask the EOR unless he tells me not to I will run the backing all the way and tie in the corners.

  Thanks again for the concise and useful information.
- By 803056 (*****) Date 02-13-2014 19:09
I agree, they are prequalified joint details for the AWS structural welding codes.

Al
Up Topic Welding Industry / General Welding Discussion / Abreviation in tail of welding symbol. Picture attached

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