Weld element, method of making and utilizing it

Claim 1

AN IMPROVED WELD NUT OF THE TYPE THAT IS TO BE WELD-SECURED TO A SURFACE OF A METAL ARTICLE; SAID WELD NUT COMPRISING, A SUBSTANTIALLY SQUARE BODY PORTION HAVING AN INTEGRAL SIDE FOR COOPERATING WITH THE METAL ARTICLE, AND HAVING A CENTRAL THREADED BORE EXTENDING THERETHROUGH AND INTERSECTING SAID INTEGRAL SIDE, SAID SIDE COMPRISING: (A) A SINGLE, CONTINUOUS, SUBSTANTIALLY PLANAR BEARING SURFACE THAT COMPLETELY SURROUNDS SAID CENTRAL THREADED BORE, (B) A WELD PROJECTION LOCATED AT EACH OF THE FOUR CORNERS OF SAID SUBSTANTIALLY SQUARE BODY PORTION AND EXTENDING OUTWARDLY BEYOND THE PLANE OF SAID BEARING SURFACE, AND (C) METAL RECEIVING GROOVE MEANS POSITIONED BETWEEN EACH OF SAID WELD PROJECTIONS AND SAID BEARING SURFACE, THE VOLUME OF SAID GROOVE MEANS BEING AT LEAST EQUAL TO THE VOLUME OF THAT PORTION OF SAID PROJECTIONS THAT EXTENDS BEYOND THE PLANE OF SAID BEARING SURFACE, SAID GROOVE MEANS BEING ASSOCIATED WITH EACH OF SAID WELD PROJECTIONS AND EXTENDING ACROSS THE CORNERS OF SAID BODY PORTION FROM ONE PERIPHERAL EDGE OF SAID SIDE TO THE ADJACENT EDGE TO EFFECTIVELY ISOLATE SAID BEARING SURFACE FROM ALL OF SAID WELD PROJECTIONS.