Higher hardness is due to the fact that hard microstructure might have formed. This is due to insufficient Pre-Heat or low Interpass temperature. Avoid faster cooling for the high yield strength steels. (Check for CE. If higher, increase the Pre-Heat). Also check for heat input. If more heat input, crack may occur.
Regards,
Vasanth
From:
Sent: 17 August 2009 12:01
To:
Subject: [MW:2950] Re: Weld Crack at Root trough weld metal
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
<br
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