RE: [MW:11120] Porosity issue in CuNi 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

 

 

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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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