70/10 CuNi tig rod 1

[iwib]

Can a 70/30 CuNi filler rod (GTAW) be use to weld a 90/10 CuNi pipe/tube? Some people say it can, but I want a more trusted opinion. If it can, what are the ideal parameters e.g. voltage, amps, wire size etc.


Cheers....

 

[SJones]

Copper Development Association, Publication 139

Consumables of 70-30 copper-nickel should be used to weld both alloys......The 70-30 consumables offer superior deposition characteristics and the corrosion resistance of the weld metal is at least comparable to both alloys

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04

 

[vpl]

iwib

How much can you trust something you read on a free Internet forum?

This isn't meant to diss Steve's excellent response or any other that people, especially the frequent contributors supply. IMO, Eng-Tips does an amazing job of providing accurate responses to all sorts of questions.

However, you really don't know how good an answer you're getting.

Now Steve gave you a hint as to where to find the answer. Since his quote only says "both alloys," you might want to confirm that your 90/10 alloy is one of those.

In fact, I'd recommend a visit to the Copper Development Association website (

http://www.copper.org)

and take a look at all their publications. I especially like their prices.

BTW, Steve, thanks for the response. Star for you.

Patricia Lougheed

******

Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of the Eng-Tips Forums.

 

[stanweld]

You could also read AWS/ASME A/SFA 5.7, A7.5. which also states that class ERCuNi (70% Cu - 30% Ni) is used to weld the copper-nickel alloys' 90/10, 80/20 and 70/30.

Also AWS Handbooks.

There is no shortage of info.

 

[iwib]

Hi VPL,

You're asking how much trust? I'd say not that much! Only to those who give references like you, Steve and Stanweld. I may just be starting but I know a few things, I do some research and it's more of just a confirmation that result of my research will be parallel to answers people give here.
I thank everybody here for their contribution, whether informative or not.


Cheers..