[TheForge] Shrinking Stainless Sheet metal

[Peter Fels And Phoebe Palmer]

Sorry for being dense, but isn't the warping a sign of heating 
induced shrinkage?
I ask because i've been having a lot of trouble using heat 
shrinking effectively on compound curves in sheet steel.
  Gotta figure it out before i start quacking like a duck, any 
more often than i do...pf

James Binnion wrote:
> No,the high thermal expansion and the low thermal conductivity is what 
> causes the warping and further heat just makes it worse in my experience.
> 
> Jim
> On Jan 18, 2007, at 8:28 PM, Peter Fels And Phoebe Palmer wrote:
> 
>> Thanks James;
>> Shouldn't those same properties make it easier to heat shrink?...pete f
>>
>> James Binnion wrote:
>>> Stainless has a 25% higher thermal expansion rate than mild steel. 
>>> This is why it is such a pita to work when you are welding  it in 
>>> thinner sections it will warp at the drop of a hat it is also a poor 
>>> thermal conductor, much worse than mild so the heating is localized 
>>> more than with the mild and the thermal expansion is acting on a 
>>> smaller area resulting in greater warping.  If possible keep beads 
>>> short and move to a different area to do next bead and keep working 
>>> different areas around whole perimeter till the complete weld is done 
>>> to keep from getting too much heat in one area. This will help but it 
>>> is still likely to warp.
>>> Jim
>>> On Jan 17, 2007, at 1:38 PM, Ries Niemi wrote:
>>>>
>>>> Theoretically, it should move much like mild steel, but its so damn 
>>>> hard to get to move, ever, that it seems to be harder to heat shrink.
>>>>
>>>> ries
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