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  1. #16
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    May 2009
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    Quote Originally Posted by Machtool View Post
    If you want to try the Hydrochloric Acid again. Take a bar of velvet soap. The soap is some what neutral, but will make a nice paste that wont run or sag.

    Regards Phil.
    I thought of soap. Have you tried it?
    woodworm.

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  3. #17
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    Apr 2002
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    Brisbane
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    This hydrofluoric acid stuff is very very nasty......it is already regulated to some extent in some states.

    It is a very deceptive product......it does not produce the same level of immediate pain and apparent tissue damage that the more common acids do.......but in the short to medium term it is incredibly dangerous stuff.

    Appart from the corrosive nature, it reacts with calcium in the body.......calcium is the metal in the body that it relies on for all bodily communication........all nerve, organ, muscle and brain function.......sufficient contact or injestion of this stuff can result in compete multiple organ failure.....once the process gets past a certain point there is not a damn thing they can do for you.

    It can be absorbed thru the skin, but it takes quite small amounts taken by mouth to kill.

    One of the very nasty things about HF is that because it robs tissues of the calcium that it needs to communicate.....it robs the acid burns of the level pain response that should be occurring.

    This stuff is incredibly nasty....if you have this stuff in quantity in a work place you should have powdered calcium in some form for surface application and injectable calcium.

    This is very very nasty stuff.


    As far as the original problem.....as the OP has found flap disks are excellent for this job.....far less aggressive and noisy that hard grinder wheels.

    These days, unless I am trying to remove a lot of material I will use a flap disk...excellent for cleaning up cuts and deburing steel....equally good for cleaning up and dressing the job after welding.

    I know duragal is supposed to be a "weld thru coating" and I have weldind thru it many times with mig and stick.......but I have taken to dressing every joint with a flap disk back to bright steel...my welds and the ease of welding have improved out of sight as a result.

    cheers
    Any thing with sharp teeth eats meat.
    Most powertools have sharp teeth.
    People are made of meat.
    Abrasives can be just as dangerous as a blade.....and 10 times more painfull.

  4. #18
    Join Date
    May 2009
    Location
    sydney
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    235

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    Quote Originally Posted by soundman View Post
    This hydrofluoric acid stuff is very very nasty......



    As far as the original problem.....as the OP has found flap disks are excellent for this job.....far less aggressive and noisy that hard grinder wheels.


    I know duragal is supposed to be a "weld thru coating" and I have weldind thru it many times with mig and stick...
    cheers
    Thanks, I'm getting the message about HF.
    I've never intentionally welded through duragal but removing it can be a nuisance in some difficult places.
    Another question, what is everyone's view on number of hinges.? On timber I always use 3. For this steel door, which is fairly heavy I've got 3 of those pre-fabbed drop-on brass pin, steel bodied, weld-on style hinges but I know from experience, if 3 are fitted it's difficult once the door is removed, to refit it. So, I'm thinking now 2 might be good enough? 10, 6mm glass panels will be fitted once it's completed. Perimeter frame is 65x35x2 with 10, 20x20x1.6 bars running horizontally. This is all for me so I can't think about the time taken to do.
    woodworm.

  5. #19
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    Apr 2002
    Location
    Brisbane
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    5,773

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    On a relatively rigid steel frame, you will be better off with 2 hinges that are strong enough.

    Unless there is flexibility or warpage in a door or lid, there is little or no advantage to more than 2 hinges that are strong enough.

    If the door and the frame are rigid, the load will most probably be borne on two of the 3 hinges anyway.

    If there is flexibility in a door, lid or its frame...then multiple hinges are of great benefit.

    cheers

    OH...be sure to grind the plate off those hinges.....both around the welded edge and off the back.....there are known issues with welding attachment and the plate on those hinges.... even welding with stick.

    cheers
    Any thing with sharp teeth eats meat.
    Most powertools have sharp teeth.
    People are made of meat.
    Abrasives can be just as dangerous as a blade.....and 10 times more painfull.

  6. #20
    Join Date
    Sep 2010
    Location
    Lebrina
    Posts
    1,099

    Default

    Quote Originally Posted by soundman View Post
    This hydrofluoric acid stuff is very very nasty......it is already regulated to some extent in some states.

    It is a very deceptive product......it does not produce the same level of immediate pain and apparent tissue damage that the more common acids do.......but in the short to medium term it is incredibly dangerous stuff.

    Appart from the corrosive nature, it reacts with calcium in the body.......calcium is the metal in the body that it relies on for all bodily communication........all nerve, organ, muscle and brain function.......sufficient contact or injestion of this stuff can result in compete multiple organ failure.....once the process gets past a certain point there is not a damn thing they can do for you.

    It can be absorbed thru the skin, but it takes quite small amounts taken by mouth to kill.

    One of the very nasty things about HF is that because it robs tissues of the calcium that it needs to communicate.....it robs the acid burns of the level pain response that should be occurring.

    This stuff is incredibly nasty....if you have this stuff in quantity in a work place you should have powdered calcium in some form for surface application and injectable calcium.

    This is very very nasty stuff.
    Yep, sure is.
    It's a wonder that there aren't more serious accidents with the stuff considering that pickling is usually the apprentice's job and in my experience very little proper instruction is given.

  7. #21
    Join Date
    May 2009
    Location
    sydney
    Posts
    235

    Default

    Quote Originally Posted by soundman View Post
    On a relatively rigid steel frame, you will be better off with 2 hinges that are strong enough.

    Unless there is flexibility or warpage in a door or lid, there is little or no advantage to more than 2 hinges that are strong enough.

    If the door and the frame are rigid, the load will most probably be borne on two of the 3 hinges anyway.



    cheers

    OH...be sure to grind the plate off those hinges.

    cheers

    Thanks, and the hinges don't have any plating on them, so ready to go there at least.
    woodworm.

  8. #22
    Join Date
    May 2009
    Location
    sydney
    Posts
    235

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    Update on my steel door. All done except for the installation of the glass panels but what I'm finding is that when it's knocked it rings like a gong. So, do I fill the main tubes with expanding foam and has anyone needed to go to such lengths? I'm hoping this effect will disappear once the glass is fitted.
    woodworm.

  9. #23
    Join Date
    Feb 2003
    Location
    back in Alberta for a while
    Age
    68
    Posts
    12,006

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    these two links on welding galvanised steel might be worth reading

    Welding Galvanized Steel -- Safely http://www.sperkoengineering.com/htm...Galvanized.pdf

    Safe Work Australia Welding FUMES AND GASES http://www.safeworkaustralia.gov.au/...s_1990_PDF.pdf
    regards from Alberta, Canada

    ian

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