2507 ss

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Does anyone know where I can find some information on GMAW flux core filler in 2507 s.s.?Common sense in an uncommon degree is what the world calls wisdom.
Reply:Welding2507 possesses good weldability and can be joined to itself or other materials by shielded metal arc welding (SMAW), gas tungsten arc welding (GTAW), plasma arc welding (PAW), flux cored wire (FCW), or submerged arc welding (SAW). 2507/P100 filler metal is suggested when welding 2507 because it will produce the appropriate duplex weld structure.Preheating of 2507 is not necessary except to prevent condensation on cold metal. The interpass weld temperature should not exceed 300°F or the weld integrity can be adversely affected. The root should be shielded with argon or 90% N2/10% H2 purging gas for maximum corrosion resistance. The latter provides better corrosion resistance.If welding is to be done on only one surface and post-weld cleaning is not possible, GTAW is suggested for root passes. GTAW or PAW should not be done without a filler metal unless post-weld cleanup is possible. A heat input of 5-38 kJ/in. should be used for SMAW or GTAW. A heat input of about 50kJ/in. can be used for SAW.From http://www.sandmeyersteel.com/2507.html#11
Reply:http://www.avestapolarit.com/upload/.../AVPDuplex.pdf
Reply:Brainfarth,Some of the larger overseas filler metal manufacturers make fluxcored filler metals for duplex stainless steels.  Check out what Bohler has to offer.  There's also a company called Metrode, although I don't know if they make a fluxcored filler, or just solid wire.In the states, SelectArc makes filler metals for duplex stainless steel.If you're unfamiliar with the welding of these alloys, post some more info on what you're working on, and I can suggest shielding and back purging gases, and other parameters for welding if you need them.Prepare to be shocked at the prices.  $15-$20 per pound is common...Benson's Mobile Welding - Dayton, OH metro area - AWS Certified Welding Inspector
Reply:2507?Sandvikhttp://www2.sandvik.com/sandvik/0140/Internet/se01280.nsf/0/ecd132de31b33bd085256bd5006d666b/$FILE/Welding%20Practice%20for%20Sandvik%20Duplex.pdfhttp://www.smt.sandvik.com/Global/Do...-eng-2006).pdfNo FCAW (S or G) filler /process listed.  GMAW, GTAW, SMAW, SAW, ESW.Sandvik's listed 'filler of choice' for welding of 2507 is 25.10.4L.  They list a wire (25.10.4L for GTAW, fine-print note stating to call Sandvik first if trying to use the wire for GMAW) and SMAW filler (25.10.4.LR).GMAW or GTAW lists several different possible shielding gases, from straight argon (first time I have ever seen straight argon listed as a shield gas for GMAW) up through argon-helium-nitrogen blend (to have some nitrogen pick-up into the weld for the 'correct' 50-50 austentite-ferrite blend and the nitrogen in the duplex filler after welding.  As well as 'special' root/back-purge shielding gases.My suggestion is to call or contact Sandvik.This does not sound like a simple 'weld it up' type of job.  The best laid schemes ... Gang oft agley ...
Reply:Thanks for the info.  Looks like I mistyped on the begining post.  We are to TIG up some large diameter pipe and I thought that cored-filler rod would be easier than back-purging. There is alot of welding to be done, so it sounds like the purge is the way to go if the price of the filler is going to be through the roof.Common sense in an uncommon degree is what the world calls wisdom.
Reply:If you are going to be doing some butt welds on duplex, it welds a little different than regular stainless. Your root bead will "freeze" almost instantly. I usually just feed wire into my puddle for my root, but on duplex I have to keyhole it and drip the wire in. It will look real pretty when you figure it out. It has a real nice shine to the finish also.         Have fun! Post some pics if you can. I would take pictures, but our work is somewhat "secretive".