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Thread: Cleaning up stainless welds

  1. #1
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    Cleaning up stainless welds

    I have been making a bunch of the same small parts and the biggest pain as you all know is the wire brushing of the weld. This is all done on 303 and 316 stainless with mig using trimix gas.

    I have some wishful thinking that there may be an easier way to clean up the finished good. I have done some google searches but not found anything so i figured I would ask. Is there some chemical bath I could dip these in that would clean them up instead of wire brushing? The welds are fine as is, just need to get the soot and discoloration off. I am guessing the answer is no but maybe someone knows something I don't. I had learned the answer is no unless you ask, and often it is still no, but once in a while it is yes.

    Thanks, Rob.

  2. #2
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    Re: Cleaning up stainless welds

    ive used the round sos like pads, that pigtail into a rubber backing of grinder/ r. angle air die grinder. red,blue,grey - depending on coarsness
    Last edited by 123weld; 04-20-2021 at 04:41 PM.

  3. #3
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    Re: Cleaning up stainless welds

    2" roloc disc with scotchbrite pads, they also make scotchbrite A/O points/drums/flapwheels that mount in die grinder. Following up with citrus surf passivation gel, and clear rinse.

    Quick change pad burgundy: https://www.mscdirect.com/product/details/03456928 grey is even finer

    Surface conditioning belts on bench top belt sander or dyna file sander : https://www.mscdirect.com/product/details/00222844

    Best to keep these separate from ones you use on mild steel, so you don't get rust spots.

    HTH
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  4. #4
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    Re: Cleaning up stainless welds

    Thanks, I made up some stuff with citric acid and a crock pot several years ago to fix a few units that got hit with a carbon steel wire brush as they were starting to rust. Learned my lesson on that one and now put plywood down on the table when I am using the wire cup.

    Was hoping for a magic bullet, the product is rod and flat so multi level, but appreciate the ideas. That citrus acid thing is a good idea to go back on and revisit.

    Going to try to slow down the grinder and maybe the brushes will last a little longer.

  5. #5
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    Re: Cleaning up stainless welds

    Google" electric passivation machine " there are many links to commercially available units as well as DIY systems.

    Here is one DIY link
    https://www.instructables.com/DIY-St...ctropolishing/
    Last edited by moose; 04-21-2021 at 09:40 PM.
    Tim
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    Stupid Hurts!!

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  7. #6
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    Re: Cleaning up stainless welds

    I have had good luck with Citrusurf products. http://citrisurf.com/

    Look under the "information tab" there is some good stuff in there.

    RideKTM350
    Last edited by RideKTM350; 04-22-2021 at 09:23 AM.

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  9. #7
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    Re: Cleaning up stainless welds

    pickling paste? Nitric acid based.

    Or electro cleaning, works great on TIG welds, not sure about MIG
    Murphy's Golden Rule: Whoever has the gold, makes the rules.

  10. #8
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    Re: Cleaning up stainless welds

    Quote Originally Posted by Munkul View Post
    pickling paste? Nitric acid based.

    Or electro cleaning, works great on TIG welds, not sure about MIG
    This for mig.

    Name:  locksmith-special-clothes-goggles-works-production-metal-processing-with-angle-grinder_168410-14.jpg
Views: 154
Size:  67.4 KB
    Weld like a "WELDOR", not a wel-"DERR"
    MillerDynasty700DX,Dynasty350DX4ea,Dynasty200DX,Li ncolnSW200-2ea.,MillerMatic350P,MillerMatic200w/spoolgun,MKCobraMig260,Lincoln SP-170T,PlasmaCam/Hypertherm1250,HFProTig2ea,MigMax1ea.

  11. #9
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    Re: Cleaning up stainless welds

    Quote Originally Posted by Munkul View Post
    pickling paste?
    good call. "wonder gel", for a hundred bucks a quart i paid. apain and a mess though. i did some piping in a basin at water treatment plant a couple yrs ago, it was neccessary to inspector, that it was all cleaned up/showroom finish, before it got submerged in **** water

  12. #10
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    Re: Cleaning up stainless welds

    I like to finish using the blue ScotchBrite discs and then a sisal or cotton wheel with black emery to cleanup the welds on stainless, followed by a wipe-down with acetone or denatured alcohol.

  13. #11
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    Re: Cleaning up stainless welds

    Quote Originally Posted by shovelon View Post
    This for mig.

    Name:  locksmith-special-clothes-goggles-works-production-metal-processing-with-angle-grinder_168410-14.jpg
Views: 154
Size:  67.4 KB
    not on stainless... not that I've ever seen... we specify all stainless welds to be "as-laid" - no grinding, just clean for dye-penetrant inspection.

    3M do some amazing fibre discs for cleaning weldburn off, though.
    Murphy's Golden Rule: Whoever has the gold, makes the rules.

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