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Re: [MW:23018] Dillmax 690 weld cracks

By Materials & Welding
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


On Mon, Mar 30, 2015 at 11:00 AM, RK <krishna.4969@gmail.com> wrote:
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
 

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