Micro-scale gas tungsten arc welding on invar sheet

Manipulation of metal microstructures via welding technique has attracted many interests due to its various applications for microscopic electronic circuits and photo-electronic structures. Refilling deletion of structures is challenging in sculpting metal microstructure. We propose the micro-size gas tungsten arc welding (GTAW) technique to overcome these challenges. The welded area of ~ 10 s μm are achieved by using an etched 100 μm W wire with optimized arc current and voltage control. The spatial size and depth of the welded spot in the invar surface show dependency on the arc current and voltages under proper Ar gas flow. We believe that these results can provide technical intuition for developing many industrial applications.