Dear Mr.Bathula Anil Kumar,
As convenient to the welders, 4 + gap is not the problem to keep and give good fusion while welding by tig. Of course the heat input will be more on the root as the process takes time.
Still as it is the tig process heat input will be with in the limit. It is purely the welder's fault of not melting the sides properly, if there is minimum mis match.
If the mismatch is more melting will be little difficult, where in you can compensate by reducing the gap and doing some preheat locally and then welding will minimise the difficulties. While the heating is done, you should ensure the root face is strong enough and no undercuts happen.
Thanks and Regards,
K.Rajagopal
On Sun, Jul 13, 2008 at 7:51 AM, Pathmanan Ganesan <p.ganesan@kharafinational.com> wrote:
Keep 2.5 mm to 3.2 mm root gap.
-----Original Message-----
From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of Bathula Anil
Kumar
Sent: 22 June, 2008 1:47 AM
To: materials-welding@googlegroups.com
Subject: [MW:880] clarification reg root gap
Dear Friends,
My Name is Anil Kumar working as a Quality Control Inspector in Qatar,
for Decon for an Oil Refinery project. I Joined the company recently and
during my regular visits to site and also reviewing various data sheets
I found that most of the defects are Root undercut, LOP and LOF, the
welding used for the production is TIG welding with 2.4mm filler wires
for all SS, CS and LTCS materials the Dia of the pipes ranges from 2inch
to 24 inch and yeah there is lot of problem with the material reg the
mismatch and ovality in the pipe apart from this another prob I observe
that the root gap used for the welding is mostly 4+ mm for all the
joints , I strongly recommended for 2.5 to 3.5 mm at the max for the
Root gap but some of the welders complaining that they are finding
difficulty in moving the electrode.
I request you to kindly suggest me what is the root gap for the above
said materials and what are the other possibilities for the above said
repairs and the corrective action required to be taken for the same.
I thank you one and all very much for creating such a beautiful group
Thanking you,
Regards
Bathula Anil Kumar
Visakhapatnam
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