View Full Version : welding a crankshaft
09-17-2002, 11:46 PM
I need to weld a cast crankshaft (I'm not sure if it is gray iron or nodular iron) and turn it back to the original specs. What would be the correct rod or wire to use because it must be machinable. I have AC and DC stick welders and migs, can it be done with the processes I have. I remember about 25 years ago when I was just getting around welding I was given a old Hobart air compressor and the valve seats were worn flat and the machinist said he could not recut the seats if it were welded with the nickel rods, a welder in the shop said no problem and told the machinist to take a cut into the head where the seats go then he welded a pass with nickel and finished building the ridge up with a 7014 . It was machined and still works today. Would this be a good way to repair it? The problem is with the mains so turning it down on my lathe should be no problem.
Thanks for any info
09-18-2002, 07:09 PM
Howdy; The best I can do for you is to have you check out another site. Go to googlegroups.com , and checkout sci.engr.joining.welding enter "crankshaft welding" in search,there is to much info to try to convey here.
09-18-2002, 08:21 PM
Thanks alot I'll try it .
09-19-2002, 03:13 PM
Howdy, I have some more info on cast for you , go to www.aws.org you will need to register. Search 'cast' or 'castiron', lots of info here.
search this forum for a post I made about welding steel to cast. Also ,more info available at www.locknstitch.com , click on the welding info. good luck
09-19-2002, 04:19 PM
I don't think you want to weld on your crankshaft to build up the journals. You want to have it built up with Chrome and then ground back down to size. It may just be cheaper to buy a new crank and be done with it...
If you are just playing around then have fun and try it. I would be concerned with warping the crank, though... Regarding machinability, I vaguely remember a 55 and 90 series of nickel rods. One is machinable and the other is not...
09-24-2002, 11:33 PM
Thank you all for the information I really appreciate the help.