Re: [MW:17155] 17098] Welding Of Pipe CRA to Pipe CRA

Dear All,

As indicated by Mr. Pradeep, technically it is not possible to weld with E8018 on austenitic SS weld since there will be a dilution and the end microstructure would fall in Martensitic range with microcracks. (Refer to schaffler diagram) 

Alternate method:

However, after completion of second pass with E309/E309LMo filler metal, you can use pure iron electrodes (with one layer of weld deposit) and subsiquent passes with E8018 electordes. This technique requires high level of welder skill, training and qualification of WPS/PQR and approval required from the client.

As it is understood that welding with pure iron electrodes does not have good welability charectirstics and achieving sound weld metal may not be possible. However, you can try with this method.

Regards,

L. Prabhu kumar,

Deputy Chief Engineer,

Saipem India Limited,
Ph. no. 9003010978.


From: "pgoswami" <pgoswami@quickclic.net>
Sent: Sat, 16 Mar 2013 17:36:41
To: <materials-welding@googlegroups.com>
Cc: <kgpandithan@gmail.com>, <samunbhatia@gmail.com>
Subject: Re: [MW:17122] 17098] Welding Of Pipe CRA to Pipe CRA

Can you deposit a crack free weld on any austenitic stainless steel , using E8018 weld metal?.

Are there good technical references? Is so , appreciate if you could circulate the same for the benefit and understanding of  all.

Thanks

Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
Ontario, Canada.
Email-pgoswami@sympatico.ca,
pgoswami@quickclic.net

-----Original Message-----
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of kannayeram gnanapandithan
Sent: Saturday, March 16, 2013 6:58 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:17121] RE: 17098] Welding Of Pipe CRA to Pipe CRA

yes

On 3/16/13, Samun Bhatia <samunbhatia@gmail.com> wrote:
> Experts,
> Root 316L
> hot 309L
> Other can we use cs like E8018 ?
> Advise pls.
>  On 16-Mar-2013 6:21 AM, "pgoswami" <pgoswami@quickclic.net> wrote:
>
>> **
>> Hello Budi,
>>
>> The brief responses to your query are as follows:-
>>
>>
>>    - weld Root with GTAW ER316- This is O.k as long as the root pass is
>>    contained within the clad (S.S-316L). However while  containing  316L
>>    run within the clad, one has to ensure that root pass is free from
>> weld
>>    defect, such that no repair is warranted
>>    - Hot Pass with SMAW  E309L Mo --this is acceptable, as 309MoL(
>>    25Cr/12Ni/2.5 Mo) with will tolerate the dilution of  the ferritic
>> API 5L
>>    X65 steel
>>    - Subsequent Fill/ Cap with E316L--*Not acceptable*, *why??* Calculate
>>    the weld metal composition at the *weld /HAZ interface*. Assume
>>    nominal 20 % dilution occurring at the interface. What would be the
>>    316L(19Cr/12Ni-2.5Mo) chemistry with this dilution? The weld metal
>> could be
>>    just borderline austenitic. The  weld ductility  could be a factor.
>> Hence
>>    the advice is to continue  welding with 309MoL right up to the cap.
>>
>> The other alternative would be to use 309MoL welding consumable (
>> both GTAW & SMAW process).For the root pass+one hot pass, use GTAW,
>> followed by SMAW the rest. This is suggested provided the client
>> allows  weld metal of slight different chemistry for the *wetted
>> surface. * Note:-309MoL weld metal may have slightly higher ferrite
>> no that 316L base metal.
>>
>> Thanks
>>
>>
>> ************
>>
>> Pradip Goswami,P.Eng.IWE****
>>
>> Welding & Metallurgical Specialist
>>
>> ************Ontario****, ****Canada********.**********
>>
>> Email-pgoswami@sympatico.ca,****
>> ****
>>
>> pgoswami@quickclic.net****
>> ****
>>
>>
>>  ------------------------------
>> *From:* materials-welding@googlegroups.com [mailto:
>> materials-welding@googlegroups.com] *On Behalf Of *Budi Witjaksono
>> *Sent:* Thursday, March 14, 2013 9:40 PM
>> *To:* materials-welding@googlegroups.com
>> *Subject:* [MW:17098] Welding Of Pipe CRA to Pipe CRA
>>
>>  Gents,****
>>
>> ** **
>>
>> We have CRA pipe to be welded to CRA pipe (API 5LX65 16-in NB x 23 WT
>> with
>> 3 mm 316L cladding) to be welded from one side.****
>>
>> One electrode supplier suggesting to weld Root with GTAW ER316, Hot
>> Pass with E309L Mo and Fill/ Cap with E316L.****
>>
>> Could you please advise whether advisable to use E316 L for Fill and
>> Cap?Please assist to respond with technical back-up since I need to
>> convince our welding manager.****
>>
>> ** **
>>
>> ****
>>
>> ** **
>>
>> Regard's****
>>
>> * *
>>
>> * *
>>
>> * *
>>
>> * *
>>
>> *Budi Witjaksono*****
>>
>> Project Manager****
>>
>> Phone: +62 778 413 250 ext: 135****
>>
>> Mobile: +62 811 770 5039****
>>
>> Fax: +62 778 413 260****
>>
>> Skype: budi.witjaksono****
>>
>> Email: budi.witjaksono@profab-group.com****
>>
>> Website: www.profab-group.com****
>>
>> [image: cid:image001.jpg@01CB8D5C.4EDB8CB0] ****
>>
>> ** **
>>
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