Thanks: 0
Needs Pictures: 0
Picture(s) thanks: 0
Results 16 to 23 of 23
-
30th December 2014, 08:07 AM #16Senior Member
- Join Date
- May 2009
- Location
- sydney
- Posts
- 235
-
30th December 2014 08:07 AM # ADSGoogle Adsense Advertisement
- Join Date
- Always
- Location
- Advertising world
- Posts
- Many
-
30th December 2014, 10:55 AM #17
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.
cheersAny 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.
-
30th December 2014, 12:53 PM #18Senior Member
- Join Date
- May 2009
- Location
- sydney
- Posts
- 235
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.
-
30th December 2014, 01:33 PM #19
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.
cheersAny 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.
-
30th December 2014, 01:34 PM #20GOLD MEMBER
- Join Date
- Sep 2010
- Location
- Lebrina
- Posts
- 1,099
-
30th December 2014, 01:48 PM #21Senior Member
- Join Date
- May 2009
- Location
- sydney
- Posts
- 235
-
18th March 2015, 08:09 AM #22Senior Member
- Join Date
- May 2009
- Location
- sydney
- Posts
- 235
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.
-
19th March 2015, 10:50 PM #23
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.pdfregards from Alberta, Canada
ian
Similar Threads
-
Need advice learning to weld
By steamjunkprops in forum WELDINGReplies: 9Last Post: 5th September 2013, 11:26 AM -
Duragal
By DoctorWu in forum WELDINGReplies: 4Last Post: 13th July 2012, 08:17 PM -
Welding Duragal without grinding
By quercus in forum WELDINGReplies: 12Last Post: 12th July 2008, 06:41 PM -
Cutlery Box - Hints, Tips, Experiences, Advice?
By RufflyRustic in forum BOX MAKINGReplies: 1Last Post: 25th May 2008, 09:56 AM