You can try Micro Plasma Welding Machine, though I am not particular of any brand. It is an automated welding at low currents and carries with it built-in pilot arcing system. I hope you can really find a good Plasma Welder.

It is better for you know the classification of rods so you know how to use them. It will then follow with your knowledge whether you need to use a rod oven or not. With this new knowledge, you are then not afraid of opening your package.