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RE: [MW:17176] HAZ hardness

By Materials & Welding

Attached is a copy of several pages from a very old book “Welding for Engineers”, by Harry Udin, Edward Funk, and John Wulff, published by John Wiley & Sons, copyright 1954.

 

It provides probably the simplest discussion of why/how the coarse grained heat affected zone is harder than the surrounding material.  One can certainly find more in depth and material specific discussions elsewhere but I believe the requester is looking of a very basic discussion.

 

Enjoy.

 

John A. Henning

Welding & Materials

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Shashank Vagal
Sent: Wednesday, March 20, 2013 1:27 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:17170] HAZ hardness

 

Gents,
HAZ  is inherently made of coarse grained structure wrt the rest of the areas - meaning more brittle and hard. Hence more hardness there, But if a PQR is OK, this excess hardness automatically falls in acceptable category. As regards heat input and HAZ hardness, if you keep close to the higher HI range value, you will end with a lower HAZ hardness due to relatively slower cooling.
SV

--- On Tue, 19/3/13, james gerald <gerry_tup@yahoo.com> wrote:


From: james gerald <gerry_tup@yahoo.com>
Subject: Re: [MW:17156] HAZ hardness
To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
Date: Tuesday, 19 March, 2013, 1:07 PM

Hardness is a function of chemical composition and thermal treatment. Normally HAZ hardness shall be within the range for the grade specified similar to that of basematerial.

 

HAZ is subjected to different peak temperatures and thermal cycles, hence the Hardness of the HAZ will be higher but shall be controlled by welding conditions.

 

Thanks & Regards

J.Gerald Jayakumar
0091-9344954677

From: Nasief Navsa <NNavsa@flexonics.co.za>
To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
Sent: Tuesday, March 19, 2013 11:31 AM
Subject: RE: [MW:17153] HAZ hardness

 

Hi All,

 

I’d like to ask a question along these lines as well. If one should compare the hardness of the HAZ with the hardness of the material, what would be the ideal condition of the?

 

Regards,

 

Nasief

 

From: materials-welding@googlegroups.com [mailto: materials-welding@googlegroups.com ] On Behalf Of Hrushikesh Sangamnerkar
Sent: 18 March 2013 04:51 PM
To: materials-welding@googlegroups.com
Subject: [MW:17145] HAZ hardness

 


Dear sir,

 

Why is the Hardness of HAZ higher than that of Weld?

 

 

Thanks and Regards,
Hrushikesh H Sangamnerkar

09724738118

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