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Old 08-08-2010, 06:44 PM
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Default Welding cutting edge?

I am doing some repairs on a skidder blade. Customer gave me the cutting edge he wanted put on (old plow edge). It was not terribly hard as it nicked easily with a file and cut fine in the bandsaw.
I did a few tacks that held fine but when I started skip welding I head the dreadful CRACK! Process is MIG with I believe ER70 wire
The weld cracked and pulled away from the cutting edge side. I did an experiment with preheating the edge to dull red and it seemed to work but that much heat raises havoc with the thinner blade side.

Any advise?
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Old 08-08-2010, 08:08 PM
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Switch to stick weld with 7018, 7018 is more ductile and will elongate as it cools.
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Old 08-08-2010, 09:13 PM
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I have welded many cutting edges on to buckets without a problem. I used
.045 duel shield and preheated just enough to take the moisture out and on a long weld I would back step.
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Old 08-08-2010, 09:54 PM
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There are weldable cutting edges and bolt on cutting edges. If is has bolt
holes in it (think plow bolts) it is the bolt on style it will give you fits
trying to weld them on. The carbon content is too high and all the pre-heat
in the world will not save your butt.

All cutting edges are hardened and then tempered, they will all be able to
be cut with a band saw. The difference is how the wear resistance is
acheived. Bolt on edges just use high carbon steel 1080m 1090, 1095 and
such. High carbon no alloy. The weldable ones will be medium carbon
.25 - .45 but the wear resistance comes from chrome and nickel in the alloy.
Easy to weld but wear resistant.
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Old 08-10-2010, 09:14 AM
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If you weld something boltable like grader blade cutting edge onto a bucket expect the dreaded "Crack" sound.
You can eliminate the problem by welding a pad of stainless onto the cutting edge and then welding the bucket to the to the stainless. Worked for me.
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Old 08-11-2010, 07:17 PM
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Well long story short, the owner bought another "weldable" cutting edge from a local machine shop. He paid cash and never got a receipt or a BOM for the steel, so once again it was mystery metal. I did a couple of tests with the MIG again with the same results.
7018 as suggested was the ticket. I dont think I made a penny on the job by the time it was all done Life experience I guess
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Old 08-11-2010, 10:26 PM
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Quote:
Originally Posted by Cavalry View Post
Well long story short, the owner bought another "weldable" cutting edge from a local machine shop. He paid cash and never got a receipt or a BOM for the steel, so once again it was mystery metal. I did a couple of tests with the MIG again with the same results.
7018 as suggested was the ticket. I dont think I made a penny on the job by the time it was all done Life experience I guess
Strange I never had that problem
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