Tiger hullsMay 19 2012 at 7:10 AM
|Eddy Willems (Login eddywillems)|
from IP address 188.8.131.52
The raw tiger hulls arriving in the Henchel factory would they be in primer or just steel?
The MIG tiger II hull would that be a raw one or already cleaned and machined?
This Tiger I hull is quite clean ( no rusty or greasy places I mean) while they are working and welding on it, did it receive a primer here already before welding?
|This message has been edited by eddywillems from IP address 184.108.40.206 on May 19, 2012 7:16 AM|
It's in red primer.
|May 19 2012, 8:37 AM |
The colours of the various parts are uniform.
Are you sure?
|May 19 2012, 1:20 PM |
To me this look much lighter than the red oxide.
Sure as I can be...
|May 19 2012, 1:51 PM |
The weld of the front plate would appear a different colour to steel plate, and would have a high-gloss finish.
The cylindical opening for the MG was machined, and would have a reflection somewhere in it.
But they both appear to have the same matte finish as the rest of the hull.
Red primer is what German industry uses.
Re: Sure as I can be...
|May 19 2012, 2:14 PM |
you are right about the MG opening, but the opening for the torsion bars are shiny so they are machined after the primer.
Did those hulls come from Krupp in red primer?
I simply don't know....
|May 19 2012, 4:23 PM |
...the manufacturing sequence of the tank. But I do believe the hulls would be primed at an early stage, to prevent rust.
Drilling of the suspension holes would have to wait until the hull was loaded into the custom jig.
Justa SWAG or two
|May 19 2012, 8:59 PM |
We all know that it is difficult to tell colors from black and white photos. The red oxide primer looks light which could be caused somehow by the bright light of the welding.
I assume the openings for the torsion bars have some sort of precision toleranced bushings installed there. I would guess that they go to some effort to keep paint from getting on the machined surface so that could explain the shiny metal.
Another thing to consider is this picture is probably staged for the press. We may not be able to assume anything about manufacturing sequence from this picture for all we know they may have set a plate up in order to make sparks and arcs for the camera guy. Sure looks like he is welding on a tiger but why primer before you are done welding. Wonder what the life span is for a guy welding on a lead based painted surface day in and day out (I am pretty sure no one was really concerned about that stuff at the time).
Improving my modeling one mistake at a time.
Pre-primed at source.
|May 19 2012, 9:48 PM |
I can't say for sure how the German steel production worked in the 1940's.
But I can't imagine the basics were that much different from I knew from the steel industry 20 years ago.
Steel plate was initially prime coated at foundry before it was issued, cut, burned or whatever.
The process was that the plate would be powdered when hot. The powder would harden in, and in a sense become a part of the finest outer layer of the plate, giving it that very dull matt red surface.
During fabrication; the cutting, welding, grinding etc, any exposed areas/ends would constantly be primed by hand/spray as production allowed.
It was this 'second level' of primer that I remember nobody wanted to do hot work on because of the fumes. The fumes/gases from the original surface prime coat was minimal.
Re: Tiger hulls
|May 20 2012, 2:20 AM |
because the drilling out and cleaning from the torsion bar openings was the first step in the assembly line, we can be sure that the hulls arrived primed. Pictures of other tank production lines give the same clean look of the steel plate, so it is probably like Grant says: primed at the source.
Re: Tiger hulls
|May 22 2012, 5:56 PM |
Really can't be primered if they are welding, they would need bare metal for proper welding cohesion....
Re: Tiger hulls
|May 22 2012, 8:26 PM |
You can arc weld directly on to the original prime surface without any problems. I used to it, daily.
If it's structural weld the edges would be prepped, clearing away any paint anyway.
Any non-structural welds; fixtures, clamps, mounts etc, could be welded down directly. Cleaning/grinding the surfaces would just cost unnecessary time. Any paint residue or other 'impurities' would just burn to the top anyway.