[MW:2951] Re: Weld Crack at Root trough weld metal

Dear Sihva, We used pipeline in Oman the same material with Bohler Foxcel E-6010 (only root), hot pas fill and cap Bohler Foxcel85 E8010-P1 also the same electodes Baku-tibilisi- ceyhan pipeline. there was no any problem occured. you needed to be carry on preheat temperature min.50celcius degree and the time between root pass and hot pass.  Note that (when the root welding is started pipe cannot move any direction after the hot pass complete).  Best Regards, Ayhan GEDUK Turkey Mobile:+90 5358811933 --- On Mon, 17/8/09, kayvan alyari <k.alyari@gmail.com> wrote: From: kayvan alyari <k.alyari@gmail.com> Subject: [MW:2950] Re: Weld Crack at Root trough weld metal To: materials-welding@googlegroups.com Date: Monday, 17 August, 2009, 2:00 PM Dear Friend   If the welding rate is not important for you, It is recommended to use E7016-G electrode for root pass to avoid cold cracking. As you know, E8010 is an cellulosic electrode and shall not be used in sour services. It has the high risk of hydrogen cracking!   Yours truly Keyvan   On 7/21/09, shiva <luvshiv2002@gmail.com> wrote: We are using API 5L X65 grade material for sour environment. With reference to our WPS we used (Ador electrodes) e 8010 for root and 8018 for hot fill pass. We took NDT and its okay. But after 1 month 4 weld joints crack. We checked the macro hardness for existing and cracked joint . There was a high hardness eg 351, 329 on root and in weld metal cap side 280 above. Which is very high. Can you please tell me for this material what type of electrodes to be used? And why this occoured ?? And what may be possible reason for this occourance? Regards, Y.C.Shiva, QA/QC Engineer, +974 6166465 Doha Qatar.

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