Research Article

Effect of Shielding Gas on Microstructures and Mechanical Properties of TC4 Titanium Alloy Ultranarrow Gap Welded Joint by Laser Welding with Filler Wire

Figure 7

XRD patterns of weld zone (a) and SEM images of weld zone with different shielding gas: (b) Ar and (c) He.
(a)
(b)
(c)