Fwd: [MW:17177] HAZ hardness

see the trailing mail for benifit of members. He is well known
Metallurgist in south
Pandithan
Welding Consultant

---------- Forwarded message ----------
From: "Arunagiri.S - IE&D" <arunagiri.s@cethar.com>
Date: Thu, 21 Mar 2013 11:34:01 +0530 (IST)
Subject: Re: [MW:17159] HAZ hardness
To: kannayeram gnanapandithan <kgpandithan@gmail.com>
Cc: mechselastine <mechselastine@gmail.com>, arun a <arunfirein2006@gmail.com>

Dear Sri Pandithan,

The higher hardness in the HAZ is as a result of very high heat input
during welding. The extent of hardness depends on the chemistry(Ceq.),
preheat & thickness of the base metals joined. This is applicable for
steels which have tendency for transformation at different
temperatures. Depending upon the temperature reached and subsequent
cooling rate in the HAZ, the transformed products viz., martensite,
bainite or ferrite and Carbides are obtained and the corresponding
hardness is attained.

In case of Austenitic stainless steels, the structure remains as
austenitic at room temperature as well as higher temperatures.
Therefore, the welding heat does not affect the hardness much but
there will be some minor precipitation at the grain boundaries.


With best wishes,

S.Arunagiri

----- Original Message -----
From: "kannayeram gnanapandithan" <kgpandithan@gmail.com>
To: "arun a" <arunfirein2006@gmail.com>
Cc: "arunagiri.s" <arunagiri.s@cethar.com>, "mechselastine"
<mechselastine@gmail.com>
Sent: Wednesday, March 20, 2013 10:19:57 AM
Subject: Fwd: [MW:17159] HAZ hardness

For ur comments pl
Pandithan

---------- Forwarded message ----------
From: "paragpan@gmail.com" <paragpan@gmail.com>
Date: Tue, 19 Mar 2013 20:57:44 +0800
Subject: Re: [MW:17159] HAZ hardness
To: materials-welding@googlegroups.com

Dear Hrushikesh,

It is due to the distortion of grain structure occurred during welding
in the HAZ area due to heat transfer from the molten weld metal to the
base metal.

Regards,

PARAG

Sent from my HTC

----- Reply message -----
From: "Hrushikesh Sangamnerkar" <hrushi612@gmail.com>
To: <materials-welding@googlegroups.com>
Subject: [MW:17145] HAZ hardness
Date: Mon, Mar 18, 2013 10:50 PM
Dear sir,
Why is the Hardness of HAZ higher than that of Weld?

Thanks and Regards,
Hrushikesh H Sangamnerkar
09724738118




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