Hello,

Is ER 347H okay as an electrode rod for welding SA 240 Type 347H to the same. I believe it is okay. Welding process is GTAW.

However while reviewing ASME Sec II Part C, SFA 5.9, I could not find any mention of ER 347H, but the code mentions ER 347.

Sharjeelfaiz,

I recommend to contact the weld material manufacturer and ask him for the recommended filler material.
For the qquestion about "347H" I recommend to look at the packaging and certificate, which AWS- or SFA specification is certified, and which Edition, that should be the source to review. For AWS-5.9 you are right there is no 347H, and this should make you wondering.

DK

ER347 can be used for welding both the grades (i.e 347/347H)

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Raghuram

Hello Sharjeel,

I agree to Dr. Koelbl. Please find attached two useful links for your information:
http://www.t-put.com/english/files/Tput_HB2005_eng.pdf
http://www.boehler-welding.com/english/files/Welding_Guide_2008_EN_verlinkt.pdf

The answer from raghurambathula is a little bit simple. You can weld AISI 347H with AISI 347 filler metal. But this leads to a joint which don’t matched the properties of the base metal AISI 347H.

Base metal AISI 347H is common used for high temperature resistant application. That means the filler metal has to be approved in long-term condition at high temperature. Filler metal AISI 347 doesn’t meet this requirement.
The right choice is e.g. ER19-10H acc. to SFA-5.9. This filler metal is high temperature resistant and resistant to scaling.

In addition please have a look at Annex A of SFA-5.9:
“ A8.47 ER19-1OH : The nominal composition (wt.-%) of this classification is 19 Cr, 10 Ni and similar to ER308H, except that the chromium content is lower and there are additional limits on Mo, Nb, and Ti. This lower limit of Cr and additional limits on other Cr equivalent elements allows a lower ferrite range to be attained. A lower ferrite level in the weld metal decreases the chance of sigma embrittlement after long-term exposure at temperatures in excess of 1000°F [540°C]. …..
This filler metal also has the higher carbon level required for improved creep properties in high-temperature service….."


Hope that helps.

_________________
Kind regards,
Juergen Fleischfresser

Yes it does definitely help.

Thank you very much.

Dr. Koebl, Raghuram and Juergen.