No wonder you can't get an answer! You incorrectly described the alloy in your initial query, and you must include more details regarding your welding process & procedures:
"looking in the region of just over 50% cobalt, 10% nickel and 20 - 30% chromium."Now GTD 222 is made up of this:
Metric English
Carbon, C 0.080 - 0.12 % 0.080 - 0.12 %
Chromium, Cr 22.2 - 22.8 % 22.2 - 22.8 %
Cobalt, Co 18.5 - 19.5 % 18.5 - 19.5 %
Manganese, Mn <= 0.10 % <= 0.10 %
Nickel, Ni 55.03 - 57.42 % 55.03 - 57.42 %
Silicon, Si <= 0.25 % <= 0.25 %
Tungsten, W 1.80 - 2.20 % 1.80 - 2.20 %
Which means that Nickel is @ over 50% in this alloy now known as: GTD 222 which is a "Centri-Vac Nickel Cobalt Alloy..." Here's the link from "MatWeb:"
http://www.matweb.com/search/datasheet.aspx?matguid=705da93caed547be8ebe479a1c440f6f&ckck=1Now, you might be able to match a similar super alloy in this chart listed in the .pdf below with GTD222 by comparing the chemical compositions shown in each alloy found in the chart.
http://www.sulzerts.com/portaldata/5/Resources//resourcecenter/toolsforyou/Super_Alloy_Compositions_.pdfHere's another set of links which may also be helpful:
http://www.c-mgroup.com/vacuum_melt_index/nickel_base_equiax.htmhttp://www.c-mgroup.com/vacuum_melt_index/equiax_xref.htmCheck out the patent for GTD 222 in this .pdf and read it carefully as it compares the chemical compositions of a few similar nickel alloy version which are slightly different in %'s of specific elements:
http://www.freepatentsonline.com/7014723.pdfHere's the starting page for this patent:
http://www.freepatentsonline.com/7014723.htmlHere's another very interesting patent regarding the use of GTD 222:
http://www.freepatentsonline.com/20110024393.pdfHere's the start page for the same patent:
http://www.freepatentsonline.com/y2011/0024393.htmlAnother interesting patent:
http://ip.com/pdf/patapp/US20110062220.pdfAnd another one:
http://www.freepatentsonline.com/7278828.pdfOne more:
http://www.freepatentsonline.com/20110042361.pdfStart page:
http://www.freepatentsonline.com/y2011/0042361.htmlFinally here's the last patent I found referring to welding of GTD 222:
http://www.patents.com/us-6652677.htmlHere's a very good and informative paper from NASA titled:Tensile Properties of Weldments in Alloy GTD 222. For example, here's an excerpt:
"The two GTD 222 vendors were Teledyne Alvac and Carlton Forge Works/Special Metals. Teledyne Alvac
supplied rolled bar with two different cross sections, L-shaped about 1.4 in. high, 0.9 in. along the base, and 0.4 in.
thick, and “hat”-shaped which were essentially rectangular, 0.5 by 1.2 in. Carlton Forge supplied a rolled ring about
1.5 in. wide radially and 0.9 in. thick. Rolling procedures were not divulged.
All the materials were solution treated before welding. The Teledyne Alvac GTD 222 was solution treated at
either 1800 or 2200 °F for 1 hr, yielding ASTM grain sizes of 9-10 or 2-3, respectively. The Carlton Forge material
was solution treated at either 2100 or 2200 °F for 1 hr, but both temperatures yielded an ASTM 2-3 grain size."
This information comes from the .pdf listed below:
http://gltrs.grc.nasa.gov/reports/1996/TM-107271.pdfYou can also buy this article from the ASME Library for $25.00 USD:
"Nickel-Base Alloy GTD-222, a New Gas Turbine Nozzle Alloy"
J. Eng. Gas Turbines Power -- January 1993 -- Volume 115, Issue 1, 155 (5 pages) Here's the link:
http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ000115000001000155000001&idtype=cvips&gifs=yes&ref=noHere's another interesting paper also:
http://iweb.tms.org/SUP/superalloys2000/01-4771-721.pdfHere's .pdf covering the MSDS of a brand of welding filler for GTD 222:
http://polymet.thomasnet.com/Asset/pmet823.pdfYou also may want to get in touch with this gentleman Named David A. Moore who wrote this paper for presentation titled:
“Wrought GTD-222: A New Structural Alloy for Gas Turbines,” ASM International Advanced Aerospace Materials/Processes Conference, Anaheim, California (1993).
Here's his CV:
http://www.unified-eng.com/people/mooreCV.htmlGo to this link to download a .pdf from the Wood Group covering repair methods for various types of turbine components including weld repairs on GTD 222:
http://wamp.tavanir.org.ir/getFile/?id=6D760D923B1642D0D016F18B1F481762Here's an interesting article from Liburdi:
http://www.liburdi.com/TurbineServices/Articles/Newsletters/Increasing%20Life%20Through%20Repair.pdfThis also is from Liburdi via ASME Turbo Expo 2009
Gas Turbine Technical Congress & Exposition
June 8-12, 2009, Orlando, Florida, USA:
http://www.liburdi.com/LiburdiEngineering/analysis-life/White%20Papers/PRACTICAL%20EXPERIENCE%20WITH%20THE%20DEVELOPMENT%20OF%20SUPERALLOY%20REJUVENATION%20%20GT2009-59444.pdf This one is from the Dept of Energy:
http://www.netl.doe.gov/technologies/coalpower/turbines/refshelf/handbook/4.4.1.pdfHere's some Russian research of these GTD nickel alloys:
http://www.omkb.ru/english/pages/news/termostabilnost.htmThese are from one of my favorite sites... University of Cambridge Department of Material Sciences & Metallurgy in the UK:
http://www.msm.cam.ac.uk/phase-trans/2002/papers/APNickelWeldv2.pdfhttp://www.msm.cam.ac.uk/phase-trans/2002/papers/Babu1.pdfThis one is an oldie, but goodie from NASA:
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19950004780_1995104780.pdfI threw this in because it's a fascinating article in itself:
http://www.tms.org/pubs/journals/JOM/0306/David-0306.htmlAnother good article:
http://site.ge-energy.com/prod_serv/products/tech_docs/en/downloads/ger3957b.pdfAnother interesting article nonetheless:
http://www.camelottech.com/CMFiles/Docs/Fuels%20Flexibility%20in%20Heavy%20Duty%20Gas%20Turbines.pdfThis one explains Laser Powder Fusion Welding:
http://www.huffmancorp.com/downloads/white_papers/LPFWcolor_Kaser.pdfFrom Pratt & Whitney:
http://www.pw.utc.com/media_center/assets/pwps_igt_f7a_nozzles.pdfhttp://www.prattwhitney.mobi/power_systems/Frame_7FA+e_Nozzles.htmlMore from GE who patented GTD 222:
http://site.ge-energy.com/prod_serv/products/tech_docs/en/downloads/ger4171.pdfThis one is from Combined Cycle Journal:
http://www.combinedcyclejournal.com/4Q2009/CCJ_24-31.pdfThis alloy, Nimonic 263 is similar to GTD 222, and is made by Special Metals Corporation:
http://www.specialmetals.com/documents/Nimonic%20alloy%20263.pdfAnother similar alloy from Special metals:
http://www.specialmetals.com/documents/Nimonic%20alloy%2090.pdfHere's their line of high performance alloys:
http://www.specialmetals.com/products/index.phpAnd this one as well:
http://www.specialmetals.com/documents/Inconel%20alloy%20740.pdfAnd these too:
http://www.specialmetals.com/documents/Joining%20%28Oct%2003%29.pdfhttp://www.specialmetals.com/documents/fabricating.pdfhttp://www.specialmetals.com/documents/Product%20Handbook.pdfFinally, Technical papers:
http://www.specialmetals.com/technical.phpWell, that's about all I could gather for now... If I find anything else of relevance, I'll post it here.
Respectfully,
Henry
P.S. You need to give us much more information in order for any of us to assist you because after all if i could read your mind, I wouldn't be here wasting my time...
I'd be in the best casino piling up the cash - CAPECHE??? In other words, the most details as possible is necessary for anyone to help you in depth.