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Hard surfacing

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clickent

07-20-2000 19:49:12




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Anybody know what the RC hardness of stainless steel electrode is?
I spent twenty years as an Army welder and used to hard surface engineer equipment using 308-16 electrode. Now as a self-employed welder I've been asked to hard surface the teeth on the brush blade of a dozer. I just happen to have 50 lb.s of 309-16 in 3/16" laying around. As I had good results with stainless steel before I think this is a good choice. I'm trying to validate this decision before I give a quote so any input would be appreciated.

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Fred OH

07-21-2000 12:46:25




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 Re: Hard surfacing in reply to clickent, 07-20-2000 19:49:12  
You as a welder know what you have done in the past and that if a file won't touch it, it's hard enough for most hard coating applications. But the acid test is to run a test piece, bearing in mind that if you have to run beads overlapping or more than one pass, it isn't as hard. Be nice to run test on one piece and keep time on it so as to get closer on the bid. The cheapest hard coat that I've used in the past is AbrasoWeld by Lincoln. Does a pretty good job and will dull your chipping hammer if you chip to inspect it. It's just as smoky as the rest but get your fan out and blow it away. See if they got an old broken off one to run test on. L8R----Fred

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Steve U.S. Alloys

07-21-2000 05:56:39




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 Re: Hard surfacing in reply to clickent, 07-20-2000 19:49:12  
The hardness of the more common grades of austenitic stainless steel like the 309 or 308 grade is about 38 on the 'C' scale. This is as applied to a stainless steel substrate. The dilution rate coupled with the type of steel being clad, determine the hardness of the deposited material in all other applications.

There are many factors to be considered before choosing the proper material, process, and procedure for hardfacing.

Stainless steel electrodes would not ordinarily be one of my choices. If interested, you may look at some materials and processes offered by U.S. Alloys on our site Link
Steve>Link

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JIMMYZZ

07-20-2000 23:31:37




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 Re: Hard surfacing in reply to clickent, 07-20-2000 19:49:12  
what you are usually looking at when hard facing is the abrasion resistance, and ,or impact resistance. all the major rod makers have booklets or charts you can check for this. but the final determination is dependent upon appliction.



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Greg

07-20-2000 22:40:16




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 Re: Hard surfacing in reply to clickent, 07-20-2000 19:49:12  
Couldn't find much in the filler metals books in a brief search, but maybe this will be of some help.

Brinell Vallues Compared with a File Scratch Test:

Brinell Hardness--File Action

100- File bites into surface very easily.
200- File removes metal with slightly more pressure.
300- Metal exhibits its first real resistance to the file.
400- File removes metal with difficulty.
500- File just barely removes metal.
600-File slides over surface without removing metal. File teeth are dulled.

Hope this helps.

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