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langtuteng2
Armenia, Joined Nov 2014, 196

langtuteng2

Armenia,
Joined Nov 2014
196
07:15 Aug-19-2019
some doubt on ISO 17640-2017
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hi, everyone! I have some doubt on the ISO17640. for Annex A, butt joint in plates and pipes, for example, if the thickness is 10mm, using the testing level A, for longitudinal discontinuities inspection, how could we get the total numbers of scanning is 2? why is it not 1?

 
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TH Kim
South Korea, Joined Sep 2017, 1

TH Kim

South Korea,
Joined Sep 2017
1
08:42 Aug-19-2019
Re: some doubt on ISO 17640-2017
In Reply to langtuteng2 at 07:15 Aug-19-2019 (Opening).

from A or B side, scanning have to be performed from both side of the weld seam.

 
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Mikel
Teacher,
GOIERRI SCHOOL, Spain, Joined Dec 2013, 7

Mikel

Teacher,
GOIERRI SCHOOL,
Spain,
Joined Dec 2013
7
19:42 Mar-23-2020
Re: some doubt on ISO 17640-2017
In Reply to langtuteng2 at 07:15 Aug-19-2019 (Opening).

hi, everyone! According to my interpretation, (A or B) means that "we can detect" longitudinal discontinuities from A or B, but when you indicate 2 scans in the table, it means that "must be inspected" from both sides of the weld (A and B).

 
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Bruno Zilli
Engineering, Ndt
Italy, Joined Apr 2018, 15

Bruno Zilli

Engineering, Ndt
Italy,
Joined Apr 2018
15
15:29 Mar-24-2020
Re: some doubt on ISO 17640-2017
In Reply to langtuteng2 at 07:15 Aug-19-2019 (Opening).

Hello,

Two (2) scans because it takes two sides of the weld, right and left referenced to the longitudinal axis. Some defects like 401 are prone to be detected only by one side of the parent material.
In general, in my opinion it is good to ensure the right ang le or closest as possible to it to the ut beam and the welding surface, where most probably are important flaws like 401-402. It has been done by the direct beam, one knot and two knots.

 
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