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 Blasting Materials

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Milan



Registration date : 2011-03-17

PostSubject: Blasting Materials   Wed Oct 19, 2011 9:26 pm

I'm interested in learning more about blasting materials used on pipes. Is sand the only material that pipe makers use to blast pipes. If so, what types of sand are used? If not, what other materials are used?
Thanks,
Milan
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Sasquatch

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Location : The Garage
Registration date : 2008-12-14

PostSubject: Re: Blasting Materials   Thu Oct 20, 2011 9:50 pm

"Sand" as such, is probably never used.

Silicon carbide, aluminum oxide, and glass bead are all used in varying degrees and varying sizes.

Speaking very generally, small grit (320, say) and high pressure (100-120 PSI) gives good detail, and most guys have a blend of grits and a use varying pressures and nozzle sizes to move from getting the bulk of the material off the pipe and then detailing it from there.
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Milan



Registration date : 2011-03-17

PostSubject: Re: Blasting Materials   Thu Oct 20, 2011 10:15 pm

Thanks Sas.
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Lesath

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Location : The Ozarks, well hidden and always at large
Registration date : 2011-07-22

PostSubject: Re: Blasting Materials   Thu Oct 20, 2011 11:02 pm

Question to Sasquatch; has anyone you know of used walnut hulls? That's what I have in my blast cabinet and I'm thinking about it. Good or bad idea?
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Sasquatch

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Location : The Garage
Registration date : 2008-12-14

PostSubject: Re: Blasting Materials   Fri Oct 21, 2011 9:06 am

Won't touch briar, is my educated guess. Most blasting cabinets are used, from what I understand, as a sort of cleanup tool, scrubbing rust off of parts or polishing things. Briar is so hard, and you are trying to get a lot of material off.... I really doubt walnut shells will do anything at all, but give it a try and let us know. What have you got to lose?
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Lesath

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Location : The Ozarks, well hidden and always at large
Registration date : 2011-07-22

PostSubject: Re: Blasting Materials   Fri Oct 21, 2011 9:21 am

Generally, I use it to either roughen up micarta or to bead blast stainless. It works well on ATS 34 and 440-C both prior to heat treat and for the cleanup afterwards, though I have concerns about contamination of the briar. I'll try it this afternoon on a scrap and see what happens.
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Sasquatch

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Location : The Garage
Registration date : 2008-12-14

PostSubject: Re: Blasting Materials   Fri Oct 21, 2011 11:25 pm

And???Question
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Lesath

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Location : The Ozarks, well hidden and always at large
Registration date : 2011-07-22

PostSubject: Re: Blasting Materials   Fri Oct 21, 2011 11:27 pm

Well, the big experiment had results, but not aggressive enough to satisfy. I was using medium grade walnut hulls at 90 psi, and I'm glad I did it on a scrap rather than a project. At least we know they're not a great choice.
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Sasquatch

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Location : The Garage
Registration date : 2008-12-14

PostSubject: Re: Blasting Materials   Sat Oct 22, 2011 10:45 am

Basically if your compressor doesn't make the lights go dim for a whole city block and you don't have pretty aggressive media, you can't blast a pipe worth beans.
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Lesath

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Location : The Ozarks, well hidden and always at large
Registration date : 2011-07-22

PostSubject: Re: Blasting Materials   Sat Oct 22, 2011 11:00 am

I'll endorse that viewpoint. I've plenty of compressor capacity, but figure a little shopping for an additional blast cabinet with a proper abrasive will solve that issue. Silicosis be hanged!
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