heat treating tool???

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I'm welding a 3/4" torque shaft into a 19mm 1\2" drive socket for a local machine shop. I'm tigging, using ss filler. When finished I want to oil quench the tool. I've done similar jobs using corn oil, heated up. Will any oil do or is there a better way?Miller TrailBlazer 251Miller HF-250-1Miller MaxStar 150 STLHyperTherm PowerMax 380 plasmaLincoln PowerMig 180Millermatic 252Miller Diversion 180
Reply:Well, the entire process seems like a geerage Fix so Corn Oil will doSure smells better than Dino erl'.Ed 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:I'm not really up on tooling, but aren't ya lookin' at 2 seperate heatings.  One to harden, and one to temper.I've done a little reading, but I'm sure that I'm not too certain about the process."Any day above ground is a good day"http://www.farmersamm.com/
Reply:Does the shaft end have a 1/2" square to fit the socket and the filler just holds things in place, or is the shaft butted onto the rear of the socket? What is the point of the quench? If you have overheated and thus over-tempered the shaft or socket, it would have to be re-hardened and then tempered correctly again and that would depend on the alloy. Most stainless alloys don't harden that way but can still be affected by high temperatures when welded to high-C containing steels. I don't know all the details so should really defer to an expert here.
Reply:Is this a SS piece?Ed 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:both the shaft and the socket are crome coated carbon of some sort. The shaft did fit into the socket, like a socket weld. I used 316 ss filler tig. I am attempting to post pics. Attached ImagesMiller TrailBlazer 251Miller HF-250-1Miller MaxStar 150 STLHyperTherm PowerMax 380 plasmaLincoln PowerMig 180Millermatic 252Miller Diversion 180
Reply:Like I said this is a geerage heat treatment and a Guess at best.Since you have welded it up, the heat has removed the hardness to some extent-  annealing You will have to heat the area up again to a Dull red and then Quench in a volume enough to move the piece around rapidly- this will put the hardness back in but now it is very brittle.For the tempering, it gets trickier as you need to be able to see the Color changes.Sand the Piece so it is shiny- slowly heat the piece to achieve the desired Color and Quench immediately.http://www.anvilfire.com/index.php?b...0anvilfire.comhttp://www.anvilfire.com/FAQs/heat_faq_index.htmEd 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:The 1/2" drive socket is likely to be 6150 chrome vanadium as will the extension (if it's a regular socket extension). I presume that that the weld is simply to prevent ending up with the socket remaining on an inaccessible nut/bolt? Or does the weld have to transmit torque?Regular austenitic stainless filler is NOT hardenable via heat treatment, nor is it the best choice for welding carbon steels though i have a couple of 'special sockets' done exactly the same way for hand usehttp://www.suppliersonline.com/propertypages/6150.asp
Reply:The alloy of the steel determines the temperature, soak time and quench medium to harden it. It also determines the temperature and soak time you temper it at. 316 SS is not heat treatable, it only work hardens.
Reply:Originally Posted by hotrodderThe 1/2" drive socket is likely to be 6150 chrome vanadium as will the extension (if it's a regular socket extension). I presume that that the weld is simply to prevent ending up with the socket remaining on an inaccessible nut/bolt? Or does the weld have to transmit torque?Regular austenitic stainless filler is NOT hardenable via heat treatment, nor is it the best choice for welding carbon steels though i have a couple of 'special sockets' done exactly the same way for hand usehttp://www.suppliersonline.com/propertypages/6150.asp
Reply:Torque wrench by hand to 100-200 ft-pounds or so?  Don't bother trying to heat treat it.  You'll probably make more of a mess of things.If the custom tool really does need to be heat treated and hardened, you used the wrong weld filler.Worried about things in the HAZ?  Temper the whole sheebang in an oven at 500F for 2 hours or so, then turn the oven off and leave the door closed and let the oven slowly cool back down overnight or so.  You'll soften the alloy steel a bit, but will hopefully temper and stress relieve the HAZ.  The best laid schemes ... Gang oft agley ...
Reply:Thanks for the knowledge, the tool does not have to be heat treated or hardened, I just wanted to produce the best possible finished product. I have to ask, what does "HAZ" refers to?Miller TrailBlazer 251Miller HF-250-1Miller MaxStar 150 STLHyperTherm PowerMax 380 plasmaLincoln PowerMig 180Millermatic 252Miller Diversion 180
Reply:Originally Posted by waginThanks for the knowledge, the tool does not have to be heat treated or hardened, I just wanted to produce the best possible finished product. I have to ask, what does "HAZ" refers to?
Reply:I agree with moonrise.  This is not a cutting tool and hardness is not a required property.  Just a mild stress-relieving soak as described by moonrise.This opinion is not based on recent experience or knowledge, but only recollection from a metallurgy class in college 50 years ago.awright
Reply:I woulld use utectic 680 and not heat treat it at all.  I have welded cracked sockets with this stuff.  There are other rods like Esab All state which is the same thing.  Done a few things like that.  You  are probably good to go, but I didn't see the amount of torque.Welds look really good.David Real world weldin.  When I grow up I want to be a tig weldor.
Reply:Welding hardened steel is a gamble.Your best bet is to TIG weld and let it cool on its own. See the problem is you do not know if the steel was air hardened,oil hardened, or water hardened when manufactured. Unless you could know that - heat treating is just a wild guess.Heat treating involves a particular heating and cooling time schedule.AWS certified welding inspectorAWS certified welder