1) If it is Butt joint: For Root Run GMAW- S ( Short Circuit mode) followed by Spray or globular mode.
a) There is separate Miller machine having capability to perform the GMAW process- Short Circuit Mode followed by Globular/ Spray Mode. The same machine you can use it for FCAW- Spray Mode. This Miller-GMAW machine is based on RMD (Regulated Machine Deposition) technique.
Consumable: Metal Core/ Solid wire both are suitable.
b) Also Lincoln is having separate machine set up to perform the GMAW-S with Short Circuit Mode for root run only and followed by any other process for filling. This Lincoln-GMAW-S based on STT (Surface Tension Transfer) technique.
Consumable: Only Solid wire.
2) If WPS as per ASME Sec.IX: Follow QW 403.10.
Regards,
Pravin Nimbalkar
Welding Engineer
BILFAL heavy Industries Ltd. Kingdom of Saudi Arabia.
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
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