results.) Similar results were obtained in the work of
Kuwana and his coworkers [9], which showed higher nitrogen
contents in the weld metal than those in this work. This
is because of the use of lower welding currents in their work
than those in the present work, which caused a decrease in
the nitrogen content in the weld metal. The reason for the
decrease in the nitrogen content with increase in the welding
current is still not clear. [9] Fig. 10 shows the amount of dferrite
content with the nitrogen content in the weld metal.
As can be seen in this ®gure, the d-ferrite content in the weld
metal is in the acceptable range (3±12%), whilst the nitrogen
contents in the weld metal is 0.13±0.15 wt% corresponding
to a nitrogen content in the argon shielding gas of 3±5%, v/v