The ornamental design for welding machine, as shown and described.
The file of this patent contains at least one drawing/photograph executed in color. Copies of this patent with color drawing(s)/photograph(s) will be provided by the Office upon request and payment of the necessary fee.
1. Welding machine
1.1 is a left perspective view of the welding machine;
1.2 is a right perspective view of the welding machine.
Ultrasonic welding machine including an indicator light that shines green when ready and red when there is a technical fault.