There is a difference between the two. When I took the course for CSWIP 3.2, TWI explained it very well and how it was called by its name is what it really is.
Incomplete Penetration is when the root did not go through the the "land"
Lack of root fusion is when the weld went through the "land" but did not fused on the "land" in one side or both sides.
On Thu, Nov 3, 2011 at 7:15 AM, Morin, Darcy (Bantrel Management Services) <MorinD@bantrelmanagementservices.com> wrote:
Thank you very much for this resource. It is very helpful.I notice what TWI describes as "lack of root fusion" and what ASME B31.3 describes as "incomplete penetration" are in fact one and the same.In normal service, a girth butt weld designed under ASME B31.3, a weld is allowed 38 mm of "incomplete penetration" for every 150 mm of weld. BUT zero "lack of fusion". Many RT interpreters under ASME B31.3 confuse the 2 indications, leading to unnecessary rework and an artificially high repair rate. Can any of our experts speak to this?Warm regards,Darcy Morin
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Anil Hegde
Sent: Wednesday, November 2, 2011 11:24 AM
To: materials-welding@googlegroups.com
Cc: harryeng.09@gmail.com
Subject: Re: [MW:12831] Welding Defect PhotoHope this will help you.--tc
On Wed, Nov 2, 2011 at 3:39 PM, Harry Patel <harryeng.09@gmail.com> wrote:
Dear Sirs,Anybody have welding defect photo like incomplet fusion,incomplete penetration, root concavity in pipe.I hope for your reply.Thank you very much in advance.--
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