
{"publication_number": "US-2004159644-A1", "abstract": "methods and apparatuses for plasma mig welding or tig mig welding are disclosed . they include a plasma or tig torch for following along a weld path by a mig torch . a constant distance may be maintained between the torches , and the angle of the torches , relative to the workpiece , may vary . the mig process is performed ep or en in various embodiments .", "application_number": "US-77878604-A", "description": "while the present invention will be illustrated with reference to a particular system and method using particular power supplies , it should be understood at the outset that the invention may be implemented using other embodiments , including other components and other methods . generally , the invention is a method and apparatus for plasma mig welding . plasma mig welding , as used herein , includes a welding process performed with a plasma arc and a mig arc acting on a common weld path , either sequentially in any order , or simultaneously . the preferred embodiment provides that a plasma torch is mounted with a mig torch , such that as the plasma torch is moved along the weld path , the mig torch trails by a small distance ({ fraction ( 1 / 2 )