where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -

840 views
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 
 

Product Spotlight

Ultrasonic Probe Recharacterization Service

NDT Systems offers a comprehensive Aftercare and Recharacterization Service for all our ultrasonic
...
probes. The Recharacterization Service is fully compliant with International ASTM E1065 Standard Guide (and other applicable standards) and offers complete documentation, traceable to the ASTM E1065 Standard. For more details or to schedule Recharacterization Services contact ndtsales@ndtsystems.com
>

OPBOX with standard software is able to do all types of inspections and measurements: flaw detection in welds and materials, scanning of objects, testing composite materials, forged and moulded pieces, many UT inspections, measurements of properties of ma

Typical applications: UT measurements with pulse technique, Measurement of thicknesses also at hig
...
h temperatures, Measurements of properties of materials, including fluids and gases We are delivering a standard version of the software (for any Microsoft Windows up to 10 x64 with Microsoft Hardware certification report Approved) and for special needs: SDK with ready to use examples for LabView, MATLAB x64, C++ wrapper for dll, Python and Linux., and also low-level description of how to control our devices directly from any USB tools
>

Conformable wedge transducer

The conformability is obtained with a flexible membrane filled with water between the transducer and
...
the inspected component. The coupling between the membrane and the component requires a small quantity of water or couplant. The conformable wedge combines the acoustic performance of immersion technique with good coupling and low attenuation.
>

High-performance Linear Phased Array Probes

Available to order from stock in a range of 5MHz – 7.5MHz and from 16 to 64 elements. Designed w
...
ith piezo-composite elements, Phoenix phased array probes provide high-resolution imaging to maximise sensitivity; accurate ultrasonic detection and sizing of defects in welds; and effective corrosion mapping. Housed in a rugged stainless steel case for on-site industrial NDT applications.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window