| dc.description | Super Duplex Stainless Steel has been studied for oil and gas industry applications
since the 90 s, but their welding always is a technical issue. Then different
methods were developed to meet all requirements presents in ASME
standards, where most of are applied for lower production, when compared
to other materials such carbon steel. This study accomplished circumferential
welding experiments in base material (BM)???UNS S32750 Super Duplex
Stainless Steel with a thickness of 3.68 mm. Welding was performed using
GMAW (Gas Metal Arc Welding) process with CMT (Cold Metal Transfer)
control and the aid of a Motoman robot and a turntable device, which were
used to ensure the accurate positioning of the torch and that the welding has
been fully implemented in the 1 G position, respectively. This process achieves
higher production in relation other welding process usually applied for this
material class. The joints which presented adequate dimensional results were,
then, subjected to tensile and hardness Vickers tests. To avoid the lack of penetration
problem, the welding was performed using the CMT process combined
with pulsed arc, thus, resulting in full penetration and improved surface
finish. The results have shown that the CMT procedure, combined with
pulsed arc, led to an adequate superficial finishing, mechanical properties and
corrosion resistance in accomplishment with the requirements presented in
applicable standards. | |
