| 摘要 |
A weld box and an apparatus for welding metal strip into tubing having improved electrical efficiency. The improvements in electrical efficiency are obtained by shielding magnetic components of the weld box from the induction field of the induction coil which is employed. Alternatively, and preferably, those magnetic parts which are exposed to the induction field have been formed of non-magnetic materials such as copper and copper base alloys. Further, short circuit paths within the weld box have been substantially eliminated by interposing insulating means between components of the weld box in the short circuit path which do not move with respect to one another. |
