GMAW Spray Welding Duplex SS

[arcer]

Does anyone have experience with GMAW spray welding of Dupplex SS? The procedure must meet the usual ferrite restrictions, impact tests, and corrosion tests per A 923, as well as the usual mechanical tests req'd per Sec IX. I have a FCAW that is qualified but this particular customer doesn't allow FCAW.

 

[metengr]

We have used the GMAW spray transfer method on low alloy and stainless steel. We had problems with lack of fusion weld defects, in general. You have to work very closely with the welders, and have them gain experience with this process to overcome these defects.


A source of excellent technical information regarding fabrication and welding of duplex ss is below;

http://www.edelstahlservice-sulz.de/neu/Techno/edelstahl/ess_duplex_steel.pdf

 

[unclesyd]

Here is some additional information on welding 2205. There are two pdf documents on 2205 on this page.
Make sure you open a full page window to show all the publications

http://www.outokumpu.com/pages/Page____10027.aspx

There is a tremendous amount of information on stainless steel at the home website under the SS group.
This site has so much information it’s a little hard to navigate.

http://www.outokumpu.com

 

[Carburize]

A philosophical question - "Why would anybody want to reject a perfectly good FCAW procedure and insist on one that most practicing welding engineers recognise as inherently prone to LOF defects??"

 

[arcer]

The only explanation I have is ignorance. I don't mean to be facetious, I relly believe that many people in the position of making these decisions, really don't know much about the process and in many cases don't know much about welding in general. I believe that fluxcore got a bad reputation many years ago (30+) in the old innershield days that it hasn't been able to completely shake. I'm not saying that FCAW is the process for all applications, but in my mind it definitely has it's place.

 

[Carburize]

I agree completely.

 

[EdStainless]

If historical bias is why the don't like FC, they why on earth would the like spray transfer? Its history isn't clean.
I would prefer FC of the two processes.
What NDT will be used on this project?

= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.

http://www.trenttube.com/Trent/tech_form.htm

 

[arcer]

I agree. Visual and RT inspections will be performed. Go figure.