API 5L X 65 ..its high yield strength material , it require very ductile materila for root & followed by high strength materila .
you shall use either E 6010 and E 7010 for root pass followed by E 8010 P1...
Normally , Hobart or Lincoln ,Bohler brand electrodes are recommended for Pipelines as it has adequate ductility and toughness.
I have developed many procedures using E 6010 & E 7010-P1 and some case with root E 8010-P1 without any problem..
We tested as per API 1104,DNV including corrosion test like HIC ,SSIC.,CTOD ...All the results are acceptable.
I don't want to guess for reason for failure..
Cheers,
Alagu
On Mon, 17 Aug 2009 16:46:55 +0530 wrote
>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
We are using API 5L X65 grade material for sour environment. Withreference 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. Wechecked the macro hardness for existing and cracked joint . There wasa 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 beused? And why this occoured ?? And what may be possible reason forthis occourance?Regards,Y.C.Shiva,
QA/QC Engineer,+974 6166465Doha Qatar.
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