1. Always use preheat. Preheat should be 100C minimum.
2. Use an E6010 electrode for root pass for all pipe grades X70 and less. The electrode is very ductile, soft (lower hardness) with less alloying, and easier to use. It is undermatched but that is really not an issue since so little of the root remains after grinding. It is also recommended to use an E8010 electrode for the hot pass (2nd pass).
Another option for the root pass is to use an E7016 electrode. There are a few good brands for pipe welding. I have a lot of experience with Kobelco and ESAB Europe.
An additional recommendation regarding pipe is it show be supplied with a max hardness of 200 HV10. You could accept 220 but that usually will require higher preheat. You can expect up to a 50 point increase in hardness for the HAZ depending on preheat and heat input control.
Geoff Rogers
Houston, TX
-----Original Message-----
From: Ali Varmazyar <av-ssg@msa.ir>
Sent: Wednesday, July 22, 2009 3:10 AM
To: materials-welding@googlegroups.com
Subject: [MW:2776] RE: 2768] Re: 2762] Re: 2742] Weld Crack at Root trough weld metal
Are you ensure that your electrodes are dry completely? any moisture makes
some cracks in your condition, pay attention to Hydrogen Induce Cracking.
Best Regards
A. Varmazyar
MSA -Welding Engineering Department
Msa,Arak,Markazi,IRAN - P.O. 148
Tel.: +988612172725~6
Fax: +988612172702
-----Original Message-----
From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of Yadav Shiva
Sent: Wednesday, July 22, 2009 10:37 AM
To: materials-welding@googlegroups.com
Subject: [MW:2768] Re: 2762] Re: 2742] Weld Crack at Root trough weld metal
Hi hamed,
In workmanship there is no problem , but i have a dought
on using 8010 electrode for root and No problem of using 8018 for
fill and hot pass. Since the material we are using is API 5L X65
Grade. Which is HSLA STEELS
Regards,
YC.Shiva,
QA/QC .
On 7/22/09, hamed <hamkan309090@gmail.com> wrote:
>
> Hi
> I think we can not tell what is the exact reason for this crack .Because
> many cases interfere in this matter. Such as :
> 1- Because the wrong process for backing of electrode it's possible to
delay
> cracking.
> 2- After root pass welder didn't do the second pass in the correct time &
> the shrinkage causes the root crack.
> 3- Wrong grinding after root pass on the connection point could make the
> small crack & because the shrinkage stress that crack propagated.
> 4- If the heat input became more than your WPS & cooling rate also high
then
> transformation of martensite phase is possible . This matter also could
> cause the brittleness.
> So my suggestion is you control these all items then sure you have not any
> crack.
>
> REGARDS
>
> -----Original Message-----
> From: materials-welding@googlegroups.com
> [mailto:materials-welding@googlegroups.com] On Behalf Of Yadav Shiva
> Sent: Wednesday, July 22, 2009 9:14 AM
> To: materials-welding@googlegroups.com
> Subject: [MW:2762] Re: 2742] Weld Crack at Root trough weld metal
>
>
> We had done all the test HIC, SSCC. and the electrode is < 5ml/100gm
> deposited weld. We can use 6010 or 7010 electrode for root and 8018
> for fill and cap . But Is there any solution where it went wrong??
>
> On 7/22/09, Sujeet Sangle <sujeetsangle@gmail.com> wrote:
>> Dear Shiva,
>>
>> As said by Mr Ali , you must do all the NACE test HIC , SSCC .
>>
>> This 8010 Electrodes are with high level of Hydrogen more then 15 ml /
100
>> gm .
>>
>> The weld has cracked due to delay cracking .
>>
>> Hope you have done the batch test of the consumable you are using for
NACE
>> tests ,
>>
>> AS suggested you can use 7010 Electrode's after batch testing .
>>
>> The other optin is also to go for 7016 down hand electrode .
>>
>> Regards,
>>
>> Sujeet Sangle
>>
>> 0091 9987781204
>>
>>
>> On 7/22/09, Ali Varmazyar <av-ssg@msa.ir> wrote:
>>>
>>>
>>> Surry, I forget to talk about your service. if your service is sour then
>>> you
>>> must consider Nace MR0175/ISO15156-2 requirements too.
>>>
>>> Best Regards
>>>
>>> A. Varmazyar
>>>
>>> MSA -Welding Engineering Department
>>> Msa,Arak,Markazi,IRAN - P.O. 148
>>> Tel.: +988612172725~6
>>> Fax: +988612172702
>>>
>>>
>>> -----Original Message-----
>>> From: materials-welding@googlegroups.com
>>> [mailto:materials-welding@googlegroups.com] On Behalf Of shiva
>>> Sent: Tuesday, July 21, 2009 6:04 PM
>>> To: Materials & Welding
>>> Subject: [MW:2742] Weld Crack at Root trough weld metal
>>>
>>>
>>> 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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