We are facing minor pore defects in CuNi 90/10
Nazz A
we are working here in qatar under Qatar Petroleum. We have to complete the fire line systrm through Cu Ni. We are using Tig welding and ising monel 67 CuNi filler wire. With goving back purging as Argon 99.99 % composition.
But still we arr facing the defects as porocity. We already covered the area and clean the parent metals and filler wire. Using all of materials like cutting disk wire brush clits and everything is non ferrous. Our present climate is summer here in Arabian dessert.
But in the Radiography,we cant controle the porocity here. Our all welders are wrll expetienced and well occupied. The poricity is always minor and when we cut out and checking its cant show.
Our acceptable criteria is lower than 0.6 mm.
I hope that you will give the right solution on our problem.
Yours regards...
Zeghanu Gigi
From: Nazz A <nazz...@gmail.com>
To: Materials & Welding <material...@googlegroups.com>
Sent: Friday, 24 July 2015, 9:53
Subject: [MW:23188] We are facing minor pore defects in CuNi 90/10
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Bijay
| Where is porosity occurs? In start and end point or every where? Sent from Yahoo Mail on Android
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george....@gr.bureauveritas.com
| From: Nazz A Sent: Σάββατο, 25 Ιουλίου 2015 - 07:45 To: Materials & Welding Reply To: material...@googlegroups.com |
Subject: [MW:23188] We are facing minor pore defects in CuNi 90/10 |
Sir I am Muhammad. we are working here in qatar under Qatar Petroleum. We have to complete the fire line systrm through Cu Ni. We are using Tig welding and ising monel 67 CuNi filler wire. With goving back purging as Argon 99.99 % composition. But still we arr facing the defects as porocity. We already covered the area and clean the parent metals and filler wire. Using all of materials like cutting disk wire brush clits and everything is non ferrous. Our present climate is summer here in Arabian dessert. But in the Radiography,we cant controle the porocity here. Our all welders are wrll expetienced and well occupied. The poricity is always minor and when we cut out and checking its cant show. Our acceptable criteria is lower than 0.6 mm. I hope that you will give the right solution on our problem. Yours regards... -- You received this message because you are subscribed to the Google Groups "Materials & Welding" group. To unsubscribe from this group and stop receiving emails from it, send an email to materials-weld...@googlegroups.com. To post to this group, send email to material...@googlegroups.com. Visit this group at http://groups.google.com/group/materials-welding. To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/193c15ab-9484-4301-a2dc-abbc4438e166%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Vanchinath S.A.
You may try argon+1.5%Hydrogen as shielding gas.
Eyup Tan
Change argon torch cup size bigger and argon flow you may increase
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José Juan Jiménez Alejandro
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Ing. Jose Juan Jimenez Alejandro
Cel. 8116171750
Skype: jjjimeneza
GENE MATSKO
pgoswami
-
Sufficient amount of de-oxidizers , such as titanium in the filler wire.The advisable content around 0.5%,
-
Cupro Nickel weld metal is more sluggish than, say, austenitic stainless steel. Weld preparations therefore need to be more open , such as an included angle of 70 to 80 deg to enable the welder to control and manipulate the weld pool. and to provide good shielding right up to the root.
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Cleanliness of weld preparations and filler wires , solvent cleaning is generally advisable before welding . Weld preparations may need to have the tenacious oxide films removed by belt or disc sanding and should be thoroughly degreased with commercially available solvents.
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The use of high purity shielding gas. The use of Ar-H2 mixed gases reduces the risk of oxidation and leaves a brighter surface after welding compared with pure argon.
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Stainless steel wire brushes and stainless steel wire wool are also useful
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Last of all when GTAW is done in field, prevention of wind draft is essential.
From: material...@googlegroups.com [mailto:material...@googlegroups.com]
Sent: Saturday, July 25, 2015 4:49 PM
To: material...@googlegroups.com
Subject: Re: [MW:23200] We are facing minor pore defects in CuNi 90/10
Nazz A
Because we cant ise the Ar H2 mixture until now because of the company procedure.
Anyway thanx for regards to everybody.
Kannayeram Gnanapandithan
To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/EBE13A3C0EF044ED9769E5C957CE09A5%40homepg.
manoj kumar
George V Aliyattukudy
Hi Manoj.
The usual steps to be followed while interpreting a radiograph is;
· Quality of the Radiograph
o Has the area of interest been covered,
o The density limitations are met
o Visibility of the IQI wires or holes (Qualifies the technique used)
· Identification
o Location marker placement
o Required Information as per applicable Code and Spec.
· Image Viewing and Flaw identification
ASME sec V Article 2 and 22 give you the required information
Trust the above will be helpful,
Regards
Viji George
From: material...@googlegroups.com [mailto:material...@googlegroups.com]
On Behalf Of manoj kumar
Sent: Sunday, October 11, 2015 10:41 AM
To: Materials & Welding
Subject: Re: [MW:23696] We are facing minor pore defects in CuNi 90/10
Dear All,
Kindly Clarify,
How weld defects are Evaluated in radiography interpretation, whether its respect to IQI.
Because film density is ok and weld bead also clearly visible with out defect, But IQI 2T hole is not clearly visible.
In this case what will v do.. whether the segment is ok or will gone for Retake.
Please kindly give the guidance with respect to ASME code.
Thanks & Regards
K. Manoj Kumar
Quality Engineer CSWIP3.1 Level II
On Saturday, 22 August 2015 13:27:19 UTC+5:30, kannayeram gnanapandithan wrote:
use Argon +helium mixture with peening
THANKS & BEST REGARDS,
KG.PANDITHAN, IWE, AWS-CWI, CSWIP 3.1,
CONSULTANT-WELDING & QUALITY
On Tue, Oct 27, 2015 at 6:48 AM, pgoswami <pgos...@quickclic.net> wrote:
Hi Muhammad,
Mr.. Gene Matsko, raised a very practical problem related to source of gas porosity and solution to the same. In spite of all good weld variables, weird issues like "Argon Leak" could cause such problems.Cupro Nickel welds generally have less flowability than austenitic stainless steel weld metals and could generate "micro porosities" in the weld for the reasons as stated above. In addition the other resources to minimize porosities could be :-
1. Sufficient amount of de-oxidizers , such as titanium in the filler wire.The advisable content around 0.5%,
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Lakshman
See, when 2T Hole is not visable how we will say weld bead is ok and no deffects?
Might be like as 2T hole,deffects also become invisible, hence required IQI should be visable,
Or else please ensure once again for the procedure for the 2T specification/sizing....
Lakshman kumar.B
Project manager.
9440031459
From: manoj kumar
Sent: 11-10-2015 19:51
To: Materials & Welding
Subject: Re: [MW:23696] We are facing minor pore defects in CuNi 90/10