Feasibility Study of Weld Metal Grain Refinement Using Pulsed Wire Feed Spray MIG Welding.

摘要

In this work, the prospects of achieving an equiaxed or refined weld metal microstructure in ferritic steels using the pulsed wire feed spray MIG process have been investigated. Despite the large number of pulse conditions used, equiaxed solidification has in general been confined only to the weld root regions. It is suggested that the process is most likely to succeed at high pulse frequencies, but is prevented from doing so by thermal inertia effects at these frequencies. (Author)