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Teletest Focus+ was the first system to use long-range guided wave ultrasonic testing to detect corrosion in pipelines.

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Technical Discussions
Mark
Mark
20:13 Oct-20-2009
Cladding Question

Hi All,

Basically I have an interview on Friday and I know they are having a problem welding inconnel to carbon steel (I don't know the grades, but they are to be used off shore and sub sea), they are having up to 5% dilution problems with the inconnel.

Has anyone ever come across this or a similar problem?

It would be a good topic to talk about at the interview and i'm struggling to find anything from the web

Mark

    
 
 Reply 
 
Roger Duwe
NDT Inspector, API-510, 570, 653
MISTRAS, USA, Joined Jan 2009, 148

Roger Duwe

NDT Inspector, API-510, 570, 653
MISTRAS,
USA,
Joined Jan 2009
148
20:44 Oct-20-2009
Re: Cladding Question
In Reply to Mark at 20:13 Oct-20-2009 (Opening).

5% dilution sounds like a submerged-arc SAW overlay. A 'colder' weld process will decrease the dilution. I would try GMAW / MAG in the short-circuiting mode. It has the least penetration, and thus least dilution, of the common welding processes.

    
 
 Reply 
 
Mark
Mark
21:06 Oct-20-2009
Re: Cladding Question
In Reply to Roger Duwe at 20:44 Oct-20-2009 .

Hi Roger,

Yeah they are using sub arc (I should have said before). They make sub surface christmas trees and apparently spent a fortune on getting 4 very expensive machines so I would imagine they will try like hell to make them viable.

I've only seen pictures of these christmas trees, so i'm not sure if they used MAG and then got these machines to help with the work load or had old sub arc machines there and replaced them.

Not used much sub arc, could polarity be a factor? ie using AC instead of DC?

    
 
 Reply 
 
Roger Duwe
NDT Inspector, API-510, 570, 653
MISTRAS, USA, Joined Jan 2009, 148

Roger Duwe

NDT Inspector, API-510, 570, 653
MISTRAS,
USA,
Joined Jan 2009
148
15:40 Oct-21-2009
Re: Cladding Question
In Reply to Mark at 21:06 Oct-20-2009 .

AC is an excellent idea. Hopefully, the new machines have that option.

SAW is run DC-Electrode Positive, putting the bulk of the heat on the wire [and flux pile]. Going to DC-Electrode Negative would put the bulk of the heat onto the base metal, a VERY bad idea. I expect that this would more than double the dilution rate.

    
 
 Reply 
 

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