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Metallic parts sometimes fail their intended use at a lower stress than they are designated for.
Various forms of wear such as abrasion, impact, metal to metal contact, heat, and corrosion can compromise the strength of metal pieces. This is where hardfacing comes in. Hardfacing is a technique which can be applied to minimize the damage from these types of wear, helping to prolong the life of metal pieces.
Hardfacing 'often called hardsurfacing' is the covering of the metallic part with a wear resistant metal by welding. Alloys which commonly need to be hardfaced include carbon alloy and low alloy steels whose carbon content is lower than 1 %. These include stainless steels, manganese steels, cast iron as well as nickel and copper-based alloys.
Metallic parts sometimes fail their intended use at a lower stress than they are designated for.
The particular hardfacing technique for a job depends on the geometry of the part and relative cost of the hardfacing method. Costs can vary with the deposition rate of the material.
These cost variations can be summarized as follows:
Applied materials commonly include cobalt based alloys such as STELITE, and nickel based materials like chromium carbide alloys. More advanced materials such as complex carbides containing columbium, molybdenum, tungsten, or vanadium can also be used and provide more overall abrasion resistance. They also have a very low friction factor, which can be used in situations involving severe abrasion.
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Hardfacing can be applied to both newly manufactured pieces, in order to prevent deterioration, or to strengthen and extend the life of worn pieces currently in use.
Red-D-Arc provides welding machines suitable for hardfacing using techniques including SMAW, FCAW and GMAW.
Red-D-Arc, an Airgas company, rents and leases welders, welding positioners, welding-related equipment, and electric power generators ' anywhere in the world. Our rental welders, positioners and specialty products have been engineered and built to provide Extreme-Duty' performance and reliability in even the harshest environments, and are available through over 70 Red-D-Arc Service Centers, strategically located throughout the United States, Canada, the United Kingdom, France, and the Netherlands, as well as through strategic alliances in the Middle East, Spain, Italy, Croatia, and the Caribbean. From our rental fleet of over 60,000 welders, 3,700 weld positioners, and 3,700 electric-power generators, we can supply you with the equipment you need ' where you need it ' when you need it.
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Jeff,
I used to work with a guy who used Mckay 118 for the first few passes and then would use Mckay 155 over it. When I asked him why, he said that the 118 would work harden better and by the time the 155 wore off the 118 was hardened. I didn't know enough about the process to know if he knew what he was talking about or not, but he did it enough that he should.
He welded uphill, but mostly welded stringers horizontally across the shutes. These were in a cement block plant and saw quite a bit of abrasion.
I'm not sure what you mean about protecting a weld though. If your asking if you can weld over a weld, the answer is yes. I guess if the 118 or 155 is welded over it, then yes it's being protected from surface wear, but probably doesn't make the weld any stronger as far as tensile strength goes.
I don't know the answer to the question about high Carbon steel, but I'm assuming that a lot of things that get hard surfaced after they show wear are high Carbon steels. They may well need a pre and or post heat, but I'm not the best person to answer that without firsthand knowledge, sorry.
Len
Now go melt something.
Instagram @lenny_gforce
Len
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