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Up Topic Welding Industry / Inspection & Qualification / undrecut criteria interperetation
- - By cbutts (*) Date 12-12-2019 01:41 Edited 12-12-2019 01:44
     I am having slight interpretation issues in regards to undercut criteria on D1.1 table 6.1, I states that undercut shall not exceed 1/16" for an accumulation of 2" over 12" of weld... my question is if you have a weld that has 3/64 undercut that exceeds the accumulation of 2" is that passable or no?
Parent - - By welderbrent (*****) Date 12-12-2019 02:42 Edited 12-12-2019 17:28
First, you have to start at the beginning.  We are talking about D1.1:2015.

Second, Table 6.1 starts undercut with 'Statically' loaded members. 

Followed by material less than 1" thick.  For this material, undercut can be 1/32" or less for the entire run of a weld regardless of length.  The 'exception' clause must be carefully considered.  IF the undercut IS over 1/32" it can be up to 1/16" for any 2" accumulation in a 12" run. 

Your 3/64" does not exist as a code measurement other than it is OVER 1/32" so it falls into the exception clause and can be up to 1/16" for up to 2" in length or accumulation of length to 2".  It is 1/32" for the whole run OR up to 1/16" for any accumulated sum to 2" in 12".

NO, it is NOT passable if it is over 2" in length, UNLESS, your material is equal to or greater than 1" thick.  Then your undercut would be acceptable regardless of length.  But, with 1" material it is rejectable if it exceeds 1/16" depth for any length.

Have a Great Day,  Brent
Parent - By cbutts (*) Date 12-12-2019 02:53
thank you sir this is what I was thinking
Parent - By Lawrence (*****) Date 12-12-2019 16:43
Great explanation Brent.

Hard to cover everything and remain brief.
Up Topic Welding Industry / Inspection & Qualification / undrecut criteria interperetation

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