Re: [MW:13491] Pre-heating for cutting

please find below my view:
Weld heat affected zone is point in base metal that has been heated in
excess of AC3 (950 deg C). The austenite that formed at this
temperature will be coarse-grained. That is why we need pre-heat. The
main purpose of pre heat is to allow base metal to slow cooling; give
a microstructure similar to that of the base metal. That's the point;
if heat from the cutting is not excess of AC3 temperature, you no need
to apply pre heat.

Rgds

2012/1/16, jesti fer <jesti_fer@yahoo.com>:
> Dear Experts,
>
> I need your help for this subject, We are fabricating some piping as per
> B31.3, the material ASTM A106 Gr.B, 8"Sch-XXS and 160 and we are doing
> preheat and PWHT for welding, but my enquiry pre heat is required for
> cutting also? It is mentioned in any code or any other were? Please help me
>
> Jesti
>
> --
> To post to this group, send email to materials-welding@googlegroups.com
> To unsubscribe from this group, send email to
> materials-welding+unsubscribe@googlegroups.com
> For more options, visit this group's bolg at
> http://materials-welding.blogspot.com/
> The views expressed/exchnaged in this group are members personel views and
> meant for educational purposes only, Users must take their own decisions
> w.r.t. applicable code/standard/contract documents.
>

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.