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Any idea what filler material I should use for UREA welding to to a Tantalum part? My understanding is that the UREA material is a modified 310L low Si, high N Stailess Steel). I am a rookie for selecting filler material and thought I would try to get a recommendation before I ruin this part.
Reply:What is tantalum?309 is the typical filler for welding stainless to a carbon steel, not sure if that helps you any or not.MM350P/Python/Q300MM175/Q300DialarcHFHTP MIG200PowCon300SMHypertherm380ThermalArc185Purox oaF350CrewCab4x4LoadNGo utilitybedBobcat250XMT304/Optima/SpoolmaticSuitcase12RC/Q300Suitcase8RC/Q400Passport/Q300Smith op
Reply:I'm no metalurgist by any stretch of the imagination but a quick Google search turned up this:"Filler wire is normally not used when welding tantalum and for best results direct current electrode negative is used. High frequency should be used for initiating the arc. Helium is recommended for welding tantalum to provide for maximum penetration since joints are designed to avoid using filler metal." from here:http://www.keytometals.com/Article50.htmMM200 w/Spoolmatic 1Syncrowave 180SDBobcat 225G Plus - LP/NGMUTT Suitcase WirefeederWC-1S/Spoolmatic 1HF-251D-1PakMaster 100XL '68 Red Face Code #6633 projectStar Jet 21-110Save Second Base!
Reply:would help if we all had more info. what is being made or repaired using this material?thru some quick reading also, it is used in areospace, nuclear reactors,chemical processing vaccum furnaces and capacitorsnow that would lead me to think you should be given some specs to welding. now www.eaglealloys.com does make a wire-- .002 thru.125 thick by 50 ft if used in those apps you have code or specs to followLast edited by prop-doctor; 01-18-2010 at 07:57 PM.idealarc 250/250 ac-dc tigidealarc 250/250 ac-dc tig #2 used for sticklincoln sp100hh125dual arbor grinder polisher30 yrs of hand tools52 pitch blocks 6p-26prake gauge -pitch gaugeG&D prop repair 918-207-6938Hulbert,okla 74441
Reply:Simply because of the exotic materials used, I assume this is a critical part and has some engineering put into it. Why skimp now, consult a weld engineer.Have we all gone mad?
Reply:Ok I did some research of my own and found some documentation that suggest using AWS ER310MoL which is some 310L modified. The alloy content is similar to the UREA. Not sure how this will work out with tantalum but atleast I know it will stick to one of the components good. I will have this inspected by the engineer that designed it after it is complete.
Reply:Who came up with this idea? I'd tell him to go urea (piss) off!Tatalum (Ta) is very corrosion resistant, is used for severe acidic processing, and is only affected by hydrofluoric acid, so I guess they need this for urea processing.The stainless alloy you are talking about is not called UREA, urea is the chemical product that is being processed which requires corrosion resistant materials.My first guess is that SS and Ta are not compatible for a fusion weld. A google search brought up some obscure paper on explosive bonding of steel and tantalum, but not much else. Typically, explosive bonding is a solid state process, non-melting, and is typically reserved for joining material that are incompatible when melted together.Ta melts at 5425 F compared to 300 series SS which melts at around 2650 F, so that does not seem good for melting together. Also, Ta welding requires excellent cleanliness since contamination with oxygen, nitrogen, hydrogen, copper, nickel, probably many other elements can cause embrittlement or cracking in welds.Take a look at this technology, claims to coat stainless steel valves and piping components with Ta for severe acid enviroments. http://www.tantaline.com/
Reply:If the temps Pulser put up are correct, you are going to waste that Ta part when 1 of 2 things happen: #1. The SS you are trying to bond to goes up in smoke from doubling it's temp to try and bond it to the Ta. Or, #2. The SS will melt and bond in, and when that material cools, it will crack like nobody's business. I am voting for #1. Brazing. #2. Silver soldering. #3 Nuts& bolts, or rivets. #4. Epoxy. #5. Duct tape. Good luck!!!And then, after so much work...... you have it in your hand, and you look over to your side...... and the runner has run off. Leaving you holding the prize, wondering when the runner will return.
Reply:I'm a welding engineer and you got me stumped. I've only read about welding it very rare. http://www.espimetals.com/tech/tantalum.pdfenjoy couldn't find any information on intermetalic welding other than resistance welding.here's the thing tantalum is $80/pound scrap price. Only ~40x the price of stainless steel. whoever can afford or justify to make something out of Ta, will certainly be paying for some qualified and certified welds and welding procedure. this isn't your garden variety Inconel.couldn't find the PPM for acceptable oxygen content. Doesn't seem to be quite as stringent as Ti or zirco, but sounds like you would need some form of trailing gas and back purge.Good luck.
Reply:Provide the joint detail and tantalum component type and I may be able to propose a method of joining these materials for you. |
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发表于 2021-9-1 00:38:21