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

Table 3

Welding parameters.

Locations	Laser power P (kW)	Welding speed V1 (m·min^−1)	Wire feed speed V2 (m·min^−1)	Defocusing amount Δf (mm)
Weld root	2.5	3	0.6	+15
Filling and capping area	3	3	0.6	+15