Re: Hardfacing
- From: "Private" <please@xxxxxxxxxxx>
- Date: Thu, 3 May 2012 15:20:16 -0700
"Steve B" <steveb@xxxxxxxxx> wrote in message
news:jnu5vi$a9g$1@xxxxxxxxxxxxxxxxxxxx
Have not done any hardfacing, but looks like I'll be doing some soon. Any
advice on how to run it? Hot? Cold? I've seen some very convex beads
indicating running it slow and cold. Is there a similar rod you could
compare it to as to how it burns? Slow movement? Short arc? Whipping?
I also hear these are quite expensive. How much more are they than common
rods? I want wear resistance. Which number should I get?
Steve
This is too big a subject to cover in a short post but here is some KISS
thoughts. I am assuming we are talking about stick rod application, (MIG is
similar).
IMHO, hard material should not be used for build-up of worn material, (too
costly and lacks strength and ductility) use 7018 for build-up. If you have
some surplus (low$$) 80,90,100 or11018 it is harder than 7018 and is good
for the last pass of build-up.
IMHO the most important thing to consider in application is to prevent
dilution of the hard material with base material. Your first pass will
always be diluted somewhat, you should run hardsurfacing rod on the cold
side but consistent with good fusion and without cold-lapping. Use a short
arc, no weaving or whipping, similar to xx18. If you have some surplus
80,90,100 or11018 you can use it for the first pass of hardsurfacing and
save some $. The second pass of hardsurface weld will be a lot harder than
the first.
If you are trying to limit wear from ground engaging surfaces then let the
dirt do the work for you. Apply the hardsurfacing in a pattern that will
trap dirt and limit contact and abrasion of the base metal. To do this try
to make your hard beads stand as tall as possible. The hard wearing beads
can be reapplied as needed before they wear down to the first diluted and
softer under bead. Even plain 7018 will help reduce wear if applied in a
good pattern that traps dirt, but it will need to be reapplied more often.
The numbers vary by supplier but in general higher numbers are harder and
more expensive. Some hard rods are designed for impact and others for
abrasive wear. Use what you get the best deal on, there is a lot of surplus
hard rods of questionable specification that have also had questionable
storage for a long time. Dry it and use it, provided that usually there is
a very low consequence of failure.
Good Luck, YMMV
.
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- Hardfacing
- From: Steve B
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