Fixing cast iron part

Steve B · 2011-04-14T05:15:14+00:00

My neighbor called me this evening about welding a cast part on the steering mechanism of his tractor. It was dark, so I haven't been able to go out and look at it. I shall look at it on my way out tomorrow on my way to Vegas. He's going to check on the cost and availability of the part tomorrow, also, then Friday, we'll pow wow and decide to try to fix or get a new one.I have welded cast before, but never correctly. What I welded were dissimilar metals, as in spindle tops on ornamental metal, which cracked off easily when he kids hit them with sticks, or I bumped them during installation I have never preheated, welded with Ni rod, and post heated.I believe that if I clean this part, grind bevel the surfaces to get good root penetration, preheat correctly, then postheat correctly, clamp to allow for warpage, that I have a good chance of fixing it. How long it holds is another matter.Any pointers on: root prep, preheating temperature and length of time, arc technique including length of arc, comparing this rod to any other rod that may burn similarly, postheating and length of time. Is there any benefit of gussetting the area for additional strength? What specific rod should I get? How do I match rod diameter to work piece thickness? I have a laser temperature gauge, but I believe this will be beyond the parameters of that sensor. What temperature Tempilstick should I get?I'll know more tomorrow when I see it, and will post a pic so you can have an idea. He says the part is relatively easy to remove, and that would give me the ability to clamp it on the bench and weld it in the flat position.This will be a first for me, and a big deal if I can save my friend some time and/or money. He's a great neighbor, and does tractor work for me for fuel costs.I do have some gas welding tips, and would this part be better gas welded than arc? If I do that, what Ni filler rod should I get? Or can I get electric rod, and use it for both types of repairs. A little...

Apr 14, 2011 26 Replies

Rate this thread:

clare 15 years ago

Did he describe the drag link or the steering arm?? I envision the steering arm, which bolts to the steering knuckle or the king-pin, depending on the tractor design. What make and model is this tractor anyway ? Might make a BIG difference on whether to repair, replace with used part, or fabricate a new one.

Vote