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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