CNC 7 Axis Double Head Spot Welding Machine The CNC 7-axis double head spot welding machine automatically moves the double welding heads along seven axes to weld all programmed points on the door panel. Firm welding quality is guaranteed by precise servo positioning, while the automatic cycle greatly reduces labor cost. Key Features - Firm Welding & Labor Cost Reduction 7-axis CNC servo system positions double heads precisely on every spot Firm and uniform welding quality