Tuesday, March 1, 2011

Re: Re: [MW:10072] Re:ROLLING

Dear Mr Lalit,
 
Recrystallization temperature is the temperature at which the elongated grains reorient themselves in to fine equaixed grains leading to isotropic properties.
 
During hot working methods (carried above recrystallisation temperature), recrystallization occurs instantaneously and yields isptropic properties. During cold/ warm working methods (carried below the recrystallisation temperature), temperature is not sufficient to recrystallise the grain and leads to anisotropic properties. Hence separate heat treatment need to be done to restore the properties.
 
Coming to surface finish, cold working method yields better results while hot working methods yields good thickness tolerances.
 
Hot/ Warm/ cold working methods (Forging, Rolling, Extrusion) for a particular material is decided based on the machine and heat treatment capacities.
Regards,
Ravi Kumar
On Tue, Mar 1, 2011 at 2:01 PM, James, GeraldJayakumar <GeraldJayakumar_James@fwuk.fwc.com> wrote:

Rolling is the process by which the plates are formed to desired size and profile by forcing the billets/plates through Rollers. If the rolling is performed at room temperature/low temperature then it is known as Cold Rolling. If the plates are rolled at High temperature beyond the Recrystallisation temperature then it is known as Hot Rolling.

 

J.Gerald

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of lalit malpure
Sent: Tuesday, March 01, 2011 12:09 PM
To: materials-welding@googlegroups.com
Subject: Re: Re: [MW:10063] Re:ROLLING

 

but what is the rolling method means hot/cold,
what is the difference???



On Tue, 01 Mar 2011 08:46:21 +0530 wrote
>Nowadays plates come with cross rolling, they are rolled at 90degrees in consequent rolling operations.

2011/2/28 sandy

Hi



The main reason is that the mechanical properties are better in the

rolling direction compare to transverse direction.

But it is not mandatory that you weld in this way.

If you weld the material in the way wht u r asking may be possible

that you will get lesser strength or other required things

as compare to long. side welding.



Regards

Sandeep



On Feb 28, 5:29 am, "Kathalingam Babu"

wrote:

> Hi

>

> It is only optional, not mandatory in many codes.

>

> Due to the fact that, there is variation in mechanical properties in Trans

> direction.

>

> Thanks & Regards,

>

> K. Babu

>

>

>

> ----- Original Message -----

> From: "Pratik Kshirsagar"

> To: "Materials & Welding"

> Sent: Sunday, February 27, 2011 12:08 AM

> Subject: [MW:10030] basic funda

>

> > Dear all,

> >          I am having a simple question which seems to be stupid but

> > just it's the basic thing. I want to know why to weld a plate in the

> > direction of rolling? What happens if the welding is carried out in

> > transverse direction that of rolling?

>

> > --

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> > meant for educational purposes only, Users must take their own decisions

> > w.r.t. applicable code/standard/contract documents.- Hide quoted text -

>

> - Show quoted text -



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--
regards,
Harish.





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