[MW:3445] Re: Dillimax 690 Material

dear all

i agree with this opinion.colling from Ms(start martensite),shall be controlled& slowed . due to stresses from transformations released & possibility of cracking is reduced.

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From: Muhammed Ibrahim <ibratech@gmail.com>
To: materials-welding@googlegroups.com
Sent: Wed, October 7, 2009 11:44:51 AM
Subject: [MW:3439] Re: Dillimax 690 Material

Dear Mr.Pieper,

 

I did not asked for PWHT. I asked only post heating which will be carried out by heating the weld joint after welding to 150 to 200 deg.c and cool under insulation. Since it is a high tensile material, sudden cooling may lead to crack.

Please see the attachment for the properties of material.

 

Regards,

Ibrahim

2009/10/6 hpi001 <pieper-qsi@kpnmail.nl>

Dear Mr. Alagarasan,

Unlike the advise of Mr. Muhammed Ibrahim I propose not to execute
Post Heat treatment after welding. This because Dillimax 690 is a
quenced and tempered material which means that the material got his
fine grain and high mechanical properties due to controlled heat
treatment. So when using Post weld heat treatment this will certainly
influence your mechanical properties negative. What my expirience is
with these kind of HYS materials is keep the preheat temperature as
low as possible but this completely depends on the wall thickness. For
example when welding to materials together with thickness of 8 mm
preheat of 50 - 75 °C only for removing any moisture will be enough.
An other important issue is the interpass temperature. For this kind
of materials you need to control cool down from 800 °C to 500 °C to
keep your properties. You also need to order Dillimax 690T when you
need impact values at -40 °C. Take a look at the website:
"www.dillinger.de" for a data sheets in the English language of this
material. You will find a lot of information on the material data
sheet.

Hope this will be helpful.

Best regards,

Herman Pieper

On 5 okt, 16:46, "G.Alagarasan" <galagara...@rediffmail.com> wrote:
>  All,
>
> Can anyone share the metallurgy and welding experience on Dillimax 690 ( High Yield Strength material 690 Mpa)??
>
> Especially , charpy at -40 DegC using FCAW ??
>
> Regards,
> Alagarasan

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Thanks & Regards
Muhammed Ibrahim PK

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