Dear Muhammed,
Preheating is to be done on Carbon steel.
Stainless steel are not noramlly preheated since thermal coefficient of expansion is very high compare to that of carbon steel which will result in warpage and this is futher enhanced by low thermal conductivity of Stainless steel compare to carbon steel.
Due to low thermal conductivity,heat does not flow as fast as that in carbon steel.
Practically if u will consider,when u will heat carbon steel obviously Stainless steel will also see some temp of around 150 deg.c
This temp wont have any affect on Stainless steel mechanical properties.
Regards
Sachin
On Thu, 03 Jul 2008 Muhammed Ibrahim wrote :
>Any body can help me to decide the pre heat temperature for welding of
>carbonsteel with stainless steel? If thickness is greater than 32mm,
> preheat is mandatory in SEC VIII. But in this case what I can follow.
>Carbon steel preheat temperature or stainless steel preheat temperature?.
>If it damage the property of stainless steel is it mandatory?
>
>Thanks & Regards
>Muhammed Ibrahim PK
>
>>
Engineer-Inspection
Aker Kvaerner-Malaysia
Mobile:012-2896901
Email1:Sachin.Sankhe@akerkvaerner.com
Email2:Sachin.sankhe@rediffmail.com
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