Ok!! Mr. Sam, I will recommend to do UT Phase Array, to discover if the annular plate has a good welding thickness. The backing is only to get a welding penetration.
Regards,2013/10/24 Sam <onlyprivate2007@gmail.com>
dear experts,--During weld visual inspection of storage tank annular bottom plate butt joints welding with backing strip, i found some length (50 mm) with excess penetration and Burn through (root concavity) on backside (soil side). it means it is on backing strip side.annular plate thickness = 10 mmbacking plate thickness = 3 mm1) may be burn through defect is only in backing strip or it may extend up to annular plate ?2) i have removed excess penetration from backing strip side. we can see some fusion problem at backstrip. but is there chance it will extend upto annular plate ?How will we evaluate this defects ?accept or reject. because we may got full penetration for annular plate and defects are in only backing strip. it is very difficult to remove full joint and reweld with new backing strip.regards,sam.
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