... 33 stands of argon arc welding machine, 3 stands of submerged arc welding machine, and Automatic straight pipe hot wire ... edge milling machine, CNC bending machine and tube end forming machine, CNC flame/plasma cutting machine, small r elbow extrusion machine, etc.); ... Ultrasonic flaw detectors, 1 stand of hydraulic universal testing machine, 3 stands of thickness gauges, matched physical and chemical ...