Posted by trucker40 on September 11, 2009 at 15:46:10 from (69.155.104.135):
In Reply to: Stitch vs Welding posted by Chuck (CA) on September 11, 2009 at 11:24:53:
Get a good welder or yourself and v out the crack.Drill a hole in each end of it so it wont spread.Heat with a torch until the paint burns off.Weld with 7018 about 3/4 of an inch at a time,peen with pointed chipping hammer,grind any slag that you still have out of your weld,weld again.Dont stop until you are done.On a long weld you may want to keep the torch handy and warm it up in front of your weld.Nickel rod will crack if it has any stress on it or you dont weld it just perfect with no slag in the weld at all.Hard to do unless you weld a lot and know what you are doing.Costs a lot too.7018 wont crack but it will crack beside it if you go too fast have slag in it,or dont do it right. People will say lots of things.Chances are they are repeating what somebody told them.Nickel rod is weaker than 7018 and its brittle.For something that just sets in one place and doesnt move it might last a long time.Something like an axle housing will have stress and you want to fix it with 7018 as long as you do it right.It will cost less and be stronger when you are done,but it can still break.If you broke the original dont expect a welded one to take the same abuse,but it might last years at a less abuse level.Ive welded a lot,and still dont know everything about welding.I have welded construction equipment with 7018 on a cast piece and it was such good cast I welded it without stopping and didnt know any better.The first time it would crack sometimes,but I would quickly v it with a grinder and reweld it and those welds didnt break.You arent going to weld the drive wheel of a dozer with nickel rod and have anything you can use,it would break in no time.Several months later the drive wheel was still holding and that was the first time I ever welded cast.I got that from calling a welding shop and asking them how they would fix it.Since then I have welded a lot of stuff thats cast with 7018 and Mig.Mig is more brittle maybe but it will work and I like both 7018 and Mig better than nickel.There is a way with a torch to weld cast that is the best.It has to be taken all apart and heated up,veed out,welded with the torch,then cooled slowly.If I needed to fix it I would try the 7018 method first,if it didnt work try to find a place with a torch to fix cast,that way will still be cheaper and better than lock n stitch.The way you describe with lock n stitch is expensive,might work,and takes a couple of days or more to do.
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