Dillmax 690 weld cracks

[RK]

Hi..

 

We have used Dillimax 690PE material for our penstocks under construction.

Experienced delayed cracking in welds (after a month or so) in all most all the welds...in all 3 welding processes used SAW, SMAW, FCAW...cracks are only in the welds!!!

Process is PH 100-150 DegC, Interpass 200 Deg C and DHT 200-250 DegC for 3 hrs.

Can anyone have any idea what could be the reasons?? we are in soup...and not able to proceed further..

 

rgds

 

[Vanchinath S.A.]

what method was used for joint preparation? gas cutting, grinding , machining ? what is the thk of joint.? can you take a photo of cracked joint and send. my mail id : vanchinaths @gmail.com

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[RK]

Gas cutting & grinding...

thickness 40 to 48 mm

photo i'm sending to your mail id..

thanks..

[LALU RAJENDRAN]

Hi,

With all high strength, quenched and tempered fine grained structural steels, DILLIMAX steels are susceptible to cracking (Cold cracking) in the weld area if the conditions are unfavorable AND these cracks may not appear until 48 hours after welding. In order to ensure that the tensile strength of the weld metal fulfills the requirements of the base metal, the heat input and interpass temperature must be limited during welding. Please refer the attached data sheets for more information.

regards,

LALU

LINKS MIDDLE EAST

ABU DHABI, UAE

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[george....@gr.bureauveritas.com]

The stresses appeared quite late.  Usually cold cracks appear after 2 days. Are you sure for the correcteness of the stress analysis on which the joint design is based

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[RK]

hi..thanks.

read these docs...no clue on reasons on where we went wrong?

[César Alexis Viteri Pérez]

I would like to see the joints geometry, do you have WPSs and photos of the failed welds (cracking long an direction, etc), the welds/structures were already loaded (used , my e-mail is alexis...@hotmail.com

Regards,

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Date: Mon, 30 Mar 2015 01:52:52 -0700
From: krishn...@gmail.com
To: material...@googlegroups.com

Subject: Re: [MW:23018] Dillmax 690 weld cracks

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/67aeebbb-b7a9-43ec-9125-fb2eda33b574%40googlegroups.com.

[J Prinsen]

Preheat is to low, should be 180°C,

What about moisture content of the consumable, heated storage, rebaking etc

Regards,

Weld-Tech vof
Jurgen Prinsen MSc IWE

----- Oorspronkelijk bericht -----
Van: "César Alexis Viteri Pérez" <alexis...@hotmail.com>
Aan: "Material Welding" <material...@googlegroups.com>
Verzonden: Woensdag 1 april 2015 20:47:53
Onderwerp: RE: [MW:23030] Dillmax 690 weld cracks

I would like to see the joints geometry, do you have WPSs and photos of the failed welds (cracking long an direction, etc), the welds/structures were already loaded (used , my e-mail is alexis...@hotmail.com
Regards,

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/67aeebbb-b7a9-43ec-9125-fb2eda33b574%40googlegroups.com .

For more options, visit https://groups.google.com/d/optout .

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