Sandeep
Section VIII is not going to tell you how perform or select your welding procedures. Nor for that matter is Section IX. Whatever process you choose will have to be properly qualified per Section IX and subsequently inspected per the requirements of the design/fabrication Code. There are certainly many ways to perform the root pass the selection of which will depend on weld geometry and process. For open root, root pass, welding the more common methods are: GTAW, SMAW with cellulosic rods (E6010, E6011), and GMAW with short circuiting arc transfer. In some applications, GMAW-pulsed arc may also be used. Others may have experience with other methods but I have found the first three comprise probably 95% of common weld applications.
Other special processes have strong application in niche markets where the cost and weld geometry permit (electron beam, laser, etc.)
John
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of sandeep
Sent: Friday, July 09, 2010 8:58 AM
To: materials-welding@googlegroups.com
Subject: [MW:5916] GMAW
Hello All
As Per ASME Sec VIII div.1, which GMAW we can use for root pass
for "P1" group materials and what is min < t < max ?.
Thanks
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