Need help selecting filler rod.

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I'm going to attempt to weld/TIG a cast iron (dont think its cast steel) exhaust manifold. I have been searching for info on cast iron welding and plan on preheating the work before I attempt striking an arc. From what I have researched on this forum I need either Ni99 or Ni55 filler rods. I dont want to get the filler rods locally because they only sell them 10#'s at a time. I have been looking on welding depot's web sight and they have a filler rod section but dont know the compound desegnation, for example welding mild steel I have been using ER70S-2. Want to make sure I get the right thing, also if you have an online source you would like to share I would love to hear about it. ThanksHummerReally old (&faithful) Lincoln SA-250 Diesel, &Longevity 200P
Reply:I have used phosphorous bronze to gas weld a bench vise back together. that's an option too.   and brazing rod is usually availible at farm or hardware storesI think I used it as tig filler.   It was about 6 years ago and I had just bought the tig.  I'm not really sure that tigging with brazing rod is appropriate,  I think it vaporizes some of the metals.  -but I didnt know better.  anyway the vise is still together.and I dont understand you said they welding depot doesnt list composition?   Ni55    Ni99    it's right there.     I'd just buy the stick electrodes and bang off the flux.http://store.weldingdepot.com/cgi/we...er_image=.htmlagain.  I dont know better.Last edited by dsergison; 06-24-2008 at 11:24 AM.
Reply:Originally Posted by dsergisonI have used phosphorous bronze to gas weld a bench vise back together. that's an option too.   and brazing rod is usually availible at farm or hardware storesI think I used it as tig filler.   It was about 6 years ago and I had just bought the tig.  I'm not really sure that tigging with brazing rod is appropriate,  I think it vaporizes some of the metals.  -but I didnt know better.  anyway the vise is still together.and I dont understand you said they welding depot doesnt list composition?   Ni55    Ni99    it's right there.     I'd just buy the stick electrodes and bang off the flux.http://store.weldingdepot.com/cgi/we...er_image=.htmlagain.  I dont know better.
Reply:nope sorry.  I dont know where to get Ni99 tig rod.- but here is another guy who was trying the same sort of thing.http://www.practicalmachinist.com/vb...d.php?t=153230you might even leave the flux on....   might make stopping and starting a bitch.can it hurt to try?
Reply:http://www.locknstitch.com/CastIronWelding.htmJust info on cast ironEd Conleyhttp://www.screamingbroccoli.com/MM252MM211 (Sold)Passport Plus & Spool gunLincoln SP135 Plus- (Gone to a good home)Klutch 120v Plasma cutterSO 2020 benderBeer in the fridge
Reply:Originally Posted by dsergisonnope sorry.  I dont know where to get Ni99 tig rod.- but here is another guy who was trying the same sort of thing.http://www.practicalmachinist.com/vb...d.php?t=153230you might even leave the flux on....   might make stopping and starting a bitch.can it hurt to try?
Reply:www.tinmantech.comKent sells the original OA cast iron fusion welding materials, ideal for manifold repairs and pretty much the only way to do a professional restoration quality long lasting job. Every method developed since was mainly to make repairs like that faster and easier....not better. -Aaron
Reply:Originally Posted by WS6HUMMERThe Nickel electrodes are stick rods, I never thought about knocking off the flux and using them, not a bad idea.
Reply:Thanks.One more thing, I found som TIG filler rods(Ni99) and noticed it says they are for AC and DC+.Does this mean if I weld cast with DC I need to run my electrode as positive (DCEP)?https://weldingsupply.securesites.co...031537%5Cs%5CsLast edited by WS6HUMMER; 06-25-2008 at 09:27 AM.Really old (&faithful) Lincoln SA-250 Diesel, &Longevity 200P
Reply:I've never seen that designation for TIG rod.  Normally AC or DC +/- distinctions are only made for stick/SMAW welding.  You can run TIG in DC+, however the amperage must be kept much, much lower; since most of the heat is concentrated on the tungsten electrode.TIG in DC+ polarity might make sense for welding really thin material, but that's the only place I can think of using it.  I can't think of any reason to run Cast Iron welds in AC mode....normally only used for aluminum and magnesium...I suggest that you double check with your supplier that the product really is TIG filler metal.... Originally Posted by WS6HUMMERThanks.One more thing, I found som TIG filler rods(Ni99) and noticed it says they are for AC and DC+.Does this mean if I weld cast with DC I need to run my electrode as positive (DCEP)?https://weldingsupply.securesites.co...031537%5Cs%5Cs
Reply:WS6HUMMERLooking at that weld page, those are not Tig rods, the page listed them as stick electrodes.  That's why it listed them as running AC or DERP.  Bang the flux off 'em, but run them DCSP.I r 2 a perfessional
Reply:Originally Posted by kbnitWS6HUMMERLooking at that weld page, those are not Tig rods, the page listed them as stick electrodes.  That's why it listed them as running AC or DERP.  Bang the flux off 'em, but run them DCSP.