Patent ID: 6825436
Filing Date: 2004-11-30
Classification: B23K,B23P,F16B

Abstract:
A box nut welding method comprising:providing a first electrode with a recess for receiving and holding a bowl-shaped cap; providing a second electrode with a recess for receiving and holding a nut; fitting a bowl-shaped cap into the recess of the first electrode; fitting a nut into the recess of the second electrode; advancing at least one of the electrodes such that the open end of the cap and the end surface of the nut held by the respective electrodes are pressed against each other; and passing a welding current through the first and second electrodes, thereby welding the cap and nut to form a box nut; wherein a guide pin adapted to fit into a threaded hole in the nut is installed in the recess of the second electrode, said guide pin having a central hole along its longitudinal direction for assisting a box nut to escape from the electrode recess after welding the nut and the cap to form the box nut.