Welding Cast Iron
Welding Cast Iron
(OP)
We propose to repair some arms from old cast iron signposts and are amazed at the cost of weld electrodes for C I work. Roughly six time more than I expected, at £3.50 per rod of 3.25 mm size Please can anyone suggest why they cost so much.
Thanks in advance
Corrosion man
Thanks in advance
Corrosion man





RE: Welding Cast Iron
RE: Welding Cast Iron
RE: Welding Cast Iron
I agree with metengr
but what is your cast iron spec?
lm
RE: Welding Cast Iron
RE: Welding Cast Iron
Maybe you should use Oxy Acetylene welding with preheat and a sand box for cooling, using cast iron welding rods for the weld.
Your difficulty these days may be finding a qualified welder to do this.
B.E.
RE: Welding Cast Iron
RE: Welding Cast Iron
The cast iron repair job is the 100 year old arms of old Yorkshire Signposts. My painting Team are shotblasting and painting them but a good number are cracked or broken due to vehical damage and have been repaired many yrs ago by mechanical straps or even very primitive weldingthat has failed. , but, yes, it is gray !!WE don't have a spec for the CI.
On advice from chicopee we braized a couple today - - (We have a very skilled welder in our W/S ) Our test is very non scientific. We lay the arm flat across two bricks then jump on it, hard. So far we are 100% sucessfull - - no breaks. My fear is that one day a heavy arm might break and fall on someones head !! We paint the arms so visual is of no importance and I guess paint keeps joint dry from rain so dissimilar metal corrosion will be no bother (I hope)
Gents, I greatly appreciate all your comments- - I guess its the Learning Curve again.
Please feel free to shout at me if I am doing anything daft
Corrosionman
RE: Welding Cast Iron
Are you doing any sort of NDT to look for cracks that haven't yet resulted in anything falling off?
I would be suspicious of arms that haven't developed a visible crack yet.
RE: Welding Cast Iron
On this welding subject please go to
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lm
RE: Welding Cast Iron
Actually, in my experience, the jumping up and down is a pretty good test. The test for brazed carbide saw mill saws is to hit them with a stick about eighteen inches long. Officially (sort of) a good man or woman takes a piece of red oak eighteen inches long and just beat the heck out of the carbide tips.
Bad brazes fail pretty easily. Good brazes hold.
Brazing can be thought of as a 'go / no go' process rather than one with grades of quality.
Of, course some good brazes are better than others but I would bet that your test is very good for the application. It is easy, simple, cheap, amusing, provides exercise for the staff and is pretty well repeatable.
Tom
Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessors.com
Good engineering starts with a Grainger Catalog.
RE: Welding Cast Iron
works on 24" thick cast iron repairs for high tension load cast iron for us