|
QUESTION:I am wondering about repairing the attaching holes
for the ripping teeth in the hardened edge of a backhoe bucket. The holes
are worn and oblonged and need to be filled and re-drilled. What is the
proper procedure for this type of repair ...How much preheat, what type of
welding rod , is post heat required.
ANSWER: I have used 10018 to repair these buckets and teeth in the past with pretty
good results. Never used any pre-heat or post heat. If its real cold you
way want to hit it a lick with a torch just enough to take the chill out....
Clamp a good-sized copper block behind the hole, then just fill them
up with 7018. This will fill them up nicely, but 7018 doesn't produce
all that hard a deposit, so you can't expect the new holes to last as
long as the original holes. If you are dead-set on hardened material
then you can use hardfacing rod, but it's going to be a prick and a
half to drill... damn near impossible with hand power tools. Might be
able to use a Cole Drill with a carbide bit, though.
If something harder is desired. a 9018,10018 or 11018 will work well. These
rods are easy to weld with, but are a bit tougher than 7018.
If you can find some 410 stainless in regular or NiMo configuaration, that
would work better than most anything else. It is an air hardening steel and
should closely approximate the properties of your cutting edge. Better than
some hardfacing electrodes as a lot of these have little compressive
strength and ductility.
|
|
|
|
