of the circle 30 of weld projections 28 and of a depth which is greater than the height of the weld projections 28 so that the projections 28 are not contacted by any part of the upper electrode 38 the pilot 29 is aligned with the opening 46 in the component part 42 and the pilot 34 extends up into the circular recess 50 in the bottom surface 48 of the upper electrode 38 and is out of contact with the upper electrode the lower electrode 40 has a weld nut locating pin 52 which extends through the opening 46 in the component part 42 through the central hole 14 in the nut body 12 and terminates in a central receptacle 54 extending upwardly from the base of the recess 50 the locating pin 52 does not contact the upper electrode 38 to avoid short circuiting when current passes between the upper and lower electrodes the weld projections 20 where heat is concentrated melt and weld to the surface of the component part 42 current passes from the upper electrode 38 into the nut body 12 through the relatively large circular area 32 thereof but without contacting the weld projections 28 on the surface 18 so that heat is not concentrated as.