This system is a tilting jig for High Current Mig welding of each 2, 4, 8-Segment of each Al Segment Plate of Trapezoid Type and Circle Type with 3D curvature during the manufacturing process of LNG Moss Spherical Tank. All work processes on the tilting jig are in order, conducting 2-Segment concave and convex welding, 4-Segment concave and convex welding, and finally 8-Segment concave and convex welding. Each equipment consists of Tilting Bed, Driving Unit, Fit-Up, Pipe Jig, Guide Unit, Rail Support, Hyd 'System, and Control System.