I know, everybody who reads this is probably saying to themseves that welding on to a crankshaft is stupid. I tend to agree. But the customer wanted me to weld a disc from a harrow to the end of a crankshaft in order to make a bird bath. The disc has a short axle running through it and there is a big bolt threaded into this axle. The bolt is rusted into the axle. To the head of this bolt I welded the harmonic balancer end of the crankshaft. After a tig pass all around with 70S2 rod I noticed cracking down the center of the weld. So I just used some 308 tig rod to weld right over the first bead. The SS weld didn't crack. So I'm wondering what crankshafts are made from and why the cracking. I know, I should have used SS rod to begin with but the customer wanted the weld to rust so it would match the rusty crank and disc. I also know I should have ground out the cracking weld before running a stainless bead over the top. But it is just a bird bath and the woman I welded it for is a cheapskate who didn't even want me to spend the time to grind off the rust before I started to weld. She thought I was just trying to pad the bill. Anyway, back to the original question, why did the weld crack? The woman is bringing me another crank to weld on, this time she wants several discs to be welded to the cheeks on the throws so that she can have a cascading bird bath/fountain. Eric
- posted
10 years ago