General welding questions that dont fit in TIG, MIG, Stick, or Certification etc.
An Interesting Video on Four Ways to Remove MILL SCALE
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https://www.youtube.com/watch?v=3ggghDldZf8
Lincoln MP 210, Lincoln Square Wave 200,
Everlast 210 EXT
Thermal Dynamics 25 Plasma cutter

" Anything that carries your livelihood wants to be welded so that Thor can’t break it."
CJ737
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Supposedly that diamond cup brush is $400+. If you can find it for $30 I'll buy two. :lol:
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Oscar wrote:Supposedly that diamond cup brush is $400+. If you can find it for $30 I'll buy two. :lol:
Cold finished it is!
Richard
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Coldman
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They didn't make mention of the purple 3m strip disc. I just used it on rusty plate and it worked good enough for this Ozzy duck.

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Flat out like a lizard drinkin'
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Yup, silicon carbide strip disk is my preferred method to be honest. Of course flap disk and hard abrasive disks have always worked as well.
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Tonylumps
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https://www.amazon.com/gp/product/B000K ... UTF8&psc=1 Try it you will never use your grinder again for Mill scale.About 20 .OZ did a 4X4 sheet both sides.I used it full strength. Today I have to clean some steel I will try and post before and after
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cj737
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Tonylumps wrote:https://www.amazon.com/gp/product/B000K ... UTF8&psc=1 Try it you will never use your grinder again for Mill scale.About 20 .OZ did a 4X4 sheet both sides.I used it full strength. Today I have to clean some steel I will try and post before and after
Yep, acid removes scale quickly. The problem is, it doesn’t care what gets in its way and won’t differentiate between what you want removed and what you don’t. Meaning, acid will continue to eat the steel after chewing through the scale. And I’d be hard pressed to ever weld on steel that’s had Acid wash. The potential for residue and lethal fumes outweighs the efficiency in this Scared Old Man’s book.
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Tonylumps
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cj737 wrote:
Tonylumps wrote:https://www.amazon.com/gp/product/B000K ... UTF8&psc=1 Try it you will never use your grinder again for Mill scale.About 20 .OZ did a 4X4 sheet both sides.I used it full strength. Today I have to clean some steel I will try and post before and after
Yep, acid removes scale quickly. The problem is, it doesn’t care what gets in its way and won’t differentiate between what you want removed and what you don’t. Meaning, acid will continue to eat the steel after chewing through the scale. And I’d be hard pressed to ever weld on steel that’s had Acid wash. The potential for residue and lethal fumes outweighs the efficiency in this Scared Old Man’s book.
That is understandable.This type is primarily used in pool Maint.After a complete rinse with water I use a cleaner S100 for a final wash. How much welding is done on chemical storage Pluming without knowing how it was cleaned before you light up.This is a reason I tried this type of cleaner .I have used a lot of Muratic acid before I retired.Most of it was on Masonary.Once a final rinse it is deluted enough and will stop activation.Being in the trades for 50 years you better know what you are doing and try to cover all of the bases Some times we can't But I try.And I do a lot of research So this seems to be pretty safe compared to the other alternatives as far as breathing either metal dust or the chemical that keeps the grinding Discs together.Use at your own risk or do not use at all.Thanks Tony
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Tonylumps
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cj737 wrote:
Tonylumps wrote:https://www.amazon.com/gp/product/B000K ... UTF8&psc=1 Try it you will never use your grinder again for Mill scale.About 20 .OZ did a 4X4 sheet both sides.I used it full strength. Today I have to clean some steel I will try and post before and after
Yep, acid removes scale quickly. The problem is, it doesn’t care what gets in its way and won’t differentiate between what you want removed and what you don’t. Meaning, acid will continue to eat the steel after chewing through the scale. And I’d be hard pressed to ever weld on steel that’s had Acid wash. The potential for residue and lethal fumes outweighs the efficiency in this Scared Old Man’s book.
That is understandable.This type is primarily used in pool Maint.After a complete rinse with water I use a cleaner S100 for a final wash. How much welding is done on chemical storage Pluming without knowing how it was cleaned before you light up.This is a reason I tried this type of cleaner .I have used a lot of Muratic acid before I retired.Most of it was on Masonary.Once a final rinse it is deluted enough and will stop activation.Being in the trades for 50 years you better know what you are doing and try to cover all of the bases Some times we can't But I try.And I do a lot of research So this seems to be pretty safe compared to the other alternatives as far as breathing either metal dust or the chemical that keeps the grinding Discs together.Use at your own risk or do not use at all.Thanks Tony
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