[TheForge] Shrinking Stainless Sheet metal

[James Binnion]

Backing the weld with argon only keeps it clean and oxide free it  
will not change the thermal expansion of the stainless which is the  
cause of the warping.

Jim
On Jan 25, 2007, at 2:10 PM, mpaietta wrote:

>        If you purge the back with argon using a purge plate
> then your welds will    come out great.
>
>    Martin
>
>> 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
>>
>> _______________________________________________
>> Manage membership or unsubscribe at:
>> http://mailman.qth.net/mailman/listinfo/theforge
>> theforge mail list group photo site is
>> http://www.photoaccess.com
>> Login:  blacksmithblacksmith at hotmail.com
>> password:  anvil
>>    ___________
>>
>>
>
>
> _______________________________________________
> Manage membership or unsubscribe at:
> http://mailman.qth.net/mailman/listinfo/theforge
> theforge mail list group photo site is
> http://www.photoaccess.com
> Login:  blacksmithblacksmith at hotmail.com
> password:  anvil
> ___________
>
>

James Binnion
jbin at well.com