Welding Disc Blades

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Ref: http://www.agrisupply.com/plain-disc...des/c/4500011/I have a bunch of stands to weld up using used disc blades for bases and 1/4" X 2" square tubing for the uprights. In the past we just cranked the MIG welder up on the hot side and put some heavy beads around the joint. After years of service, occasionally a crack will develop just outside the bead on the disc blade. The blades are much harder than the mild steel tubing.Anyone know what type of steel disc blades are made of?We now have both MIG and TIG welders at our disposal. What would be the preferred method to weld these stands?Thanks BigSmith
Reply:(while I'm waiting for the water heater to drain............)I've repaired a moldboard using 7014, and it held up well.  I had to patch in a cracked section by removing the section, then welding in a piece of mild steel, and padding the mild steel to make a wear surface.  It's held for years.I'm assuming a moldboard is similar material wise, but not sure.  I hope this helps"Any day above ground is a good day"http://www.farmersamm.com/
Reply:"After years of service, occasionally a crack"I imagine I would just MIG weld them againEd 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 would guess they're high carbon steel, but the pone number ( 800 345-0169) of the site you posted is free to call and they might either know or be able to find out for you.Discs are frequently  used as stanchions by members of the old engine clubs, often having pipe fittings welded on so the uprights can easily be removed. Lots of that is done by stick welding, but I'd agree with Broccoli's comment that if past ones have lasted well, just use the same technique as before.
Reply:ahh the old disc fried up many o fish and shrimp over an open fire on the beach in elgolffo sure was fun down there before Mexico went crazy350P 30A spool gun cut master 51  syncro 250 other stuff " take a dog off the street and make him prosper and he will not bite you sad the same cannot be said for man" i didnt use punctuation just to piss you off
Reply:i dont remember the steel type,but i know they are high carbon. allied products company (no longer in business) used to stamp them in the old studabaker plant in south bend ,indiana. the steel blanks were pre-heated in a furnace and then stamped hot.
Reply:You will want to stick weld them with a Med to HI carbon steel rod for sure. Even good old 7018 would work for this.JasonLincoln Idealarc 250 stick/tigThermal Dynamics Cutmaster 52Miller Bobcat 250Torchmate CNC tableThermal Arc Hefty 2Ironworkers Local 720
Reply:Have welded a good number of them for stands and  woks . All I have ever used was 7018 or the mig . Never had an issue with cracking.