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Tool Talk Discussion Forum

Re: HardSurfacing 101 (Video)

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NCWayne

03-05-2013 23:22:05
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Hye Lanse, great video. A few pointers for future refference. One---Your right on with the buildup/buttering welds for worn parts. Better though is to do the buildup on a new part and prevent the wear from day one. Two---I looked into doing some hardfacing on a manganese front shovel bucket a few years back. There was nothing in any of the recommendations about preheating, unless you were doing the work in excessivly cold temps. Even then the recommendation was to only take the temp to around 70-80 degrees F. In fact, one main point made was to keep the temps relatively low on the base metal, or more exactly not to exceed 500 degrees. (((Check out the link below, the 14th brochure down the page covers this))). Three---Most hardfacing is going to checker/crack wether you do one pass or two. Fact is many rods actually require two, of sometimes more, passes on top of each other to achieve full hardness. I've done cable plow blades (usually I use only a single pass on the sides but two on the leading edge) and have stood there watching and/or listening to the beads crack as I did one part while another began to cool. I've got one customer with a blade that has only been back twice for a touchup since the first repair/hardfacing job I did on it back in 2009. Given that these blades typically only last a few months before being worn competely out, the time this one has lasted says alot about the economy achieved by hardfacing. The problem I always encounter is getting the customer to see the big picture and the savings they can achieve by the process, given it's often high cost to do. Last but not least---- If you have a large area that needs to be protected, or are making something like a set of skid plates for a snow plow, etc, etc, they make a clad plate for that. It's basically a mild steel plate with a one face hardsurfaced. You need a plasma to cut it but to apply all you need is a 7018 rod to weld the backing plate to the base metal of the object your working on. Once in place a layer of hardfacing over the attaching bead and you've got one heck of a wear surface. They make the backing plate in various thicknesses, so you have options depending on the location it's being used. I've done large 'material wear' areas and skid surfaces both on two buckets using plate from Cronatron, one job on a 980 CAT loader, and the other on a 345B CAT excavator. Both dig pit gravel every day. The loader bucket was done about 9 years ago, the excavator around 5 years ago. I was at the customers quarry last week and even though the material is now shiny, you can still see the ripples in the hardfacing on the clad plate I used on both pieces. Most amazing are the skid plates on the bottom of the loader bucket. In other words it's some really tough stuff.....

Good luck in school, and keep up with the great vids. It's really nice to see young guys like you actually take an interest in trades like this and not just content to set on your butt playing video games like many nowdays do.

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