tig hardend shaft

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trying to weld a thin steel pulley to a hardend steel shaft on the trans. of a push mower. what tig wire would work the best? tried to mig it but the weld pulled out of the shaft.
Reply:It depends on the material...obviously. How thick is the shaft? Did you have enough heat when using the MIG? If one or the other is stainless and the other piece is mild steel, then I would use a 308L filler. You can use ER70S-6 to get them to stick but when doing mild to SS I use the 308. Does a magnet stick to both the pieces?John -  fabricator extraordinaire, car nut!-  bleeding Miller blue! http://www.weldfabzone.com
Reply:well I am not that eperienced on this but I would try just mild steel rod. put more heat on the shaft then the pulley..
Reply:The weld heat affected zone on the shaft is hard and brittle because it is a "hardenable" steel and it has essentially been heated and quenched during the weld process.You can try welding using 309 SS filler, with preheat and slow cooling.  The 309 is ductile and will stretch some under thermal stresses of welding and not tend to "pull out" the brittle HAZ.  The preheat and slow cooling help lessen the formation of brittle martensite.BUT, I would reccomend doing a TIG braze with silicon bonze (Everdur).Since brazing does not melt the base metal, and braze filler is ductile, this should work ok.
Reply:There's 10 to 1 odds that the shaft is only case hardend..Its only for wear..Fully hardend shafts will break every time.. If you can grind off only.010 deep...then hit it with a file..If the file leaves marks then the hardness has been removed and it will be safe to proceed.....zap!I am not completely insane..Some parts are missing Professional Driver on a closed course....Do not attempt.Just because I'm a  dumbass don't mean that you can be too.So DON'T try any of this **** l do at home.
Reply:If you get the crank hot enough for a good weld and cool slowly, you might smoke the seal.  DavidReal world weldin.  When I grow up I want to be a tig weldor.
Reply:the shaft was a quarter inch hex with a 3/8 long stud. the pulley slipped over the hex and a nut held it on. the stud broke off when trying to remove the nut. i ended up using stainless wire and it seam to holding. thanks for the help.
Reply:Good to hear, glad it worked out for you! John -  fabricator extraordinaire, car nut!-  bleeding Miller blue! http://www.weldfabzone.com
Reply:so what it stainless?  what did u do differnt other than stainelss wire
Reply:Originally Posted by infamousjerso what it stainless?  what did u do differnt other than stainelss wire