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RE: [MW:11120] Porosity issue in CuNi welding

By Materials & Welding
This is very common when welding  ER Cu Ni. If all parameters are under control then I suggest change the brand of consumable. Use a branded consumable namely UTP Made in Germany. We had similar problem and we resolved by the above method.
Regards
Ajay Goel
 



 


Date: Sun, 22 May 2011 10:40:40 +0400
Subject: [MW:11114] Porosity issue in CuNi welding
From: romiomdabre@gmail.com
To: materials-welding@googlegroups.com

Dear All
 
We have noticed porosity issue in CuNi piping.
 
Material - ASTM B466 UNS C70600
Pipe Size 1/2" to 6"
Pipe Wall hk - 2.77 to 4.0mm
Welding Process - GTAW
Filler Wire - ERCuNi
Welding Position - 6G
Purging / Shilding - 99.995 % Ar.
Flow rate Shileding 15 - 25 Cfh
Flow rate Purging - We have welded  coupons with different flow rate like 15 -25 , 20 - 30 then 30-40
Interpass 100°C Max.
 
Please note that we have taken all general care like, cleaning, SSwire brush, Grinding wheels etc.
 
Request your valuable suggestion  & if there is any documentes / articles on CuNi welding pls provide.  
 

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