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On the other hand, it is well known that the employment of different shielding gases, as well as changes in welding procedure parameters, lead to variations in the deposit characteristics (Ref.9-17).Generally, the most frequently used gas for welding with rutile-type flux cored wires is CO2, but is also possible to use Ar/CO2mixtures. This type of protection results in improved appearance, less spatter ,and better arc stability (Ref.9).On the other hand, in all arc welding processes, it is important that the arc energy control influence metallurgical transformations and resulting mechanical properties and microstructure (Refs10-14).In multipass welding ,changes in welding parameters lead to different arc energies and different number of passes per layer for the same joint design (Refs.10,11).Welding position is another important variable (Ref.16).
In particular, the objective of this work was to study the effect of shielding gas type(CO2and Ar/CO2mixture),flat and uphill welding positions, arc energy (between 1.2 and 2.2 kJ/mm),and number of passes per layer(2 and 3) on the all-well-weld-metal mechanical properties and microstructure, obtained from a metal cored wore, of the ANSI/AWS A5.29-98 E91T5K2/E101T5-K3 type.