Browse Prior Art Database

Percussive Weld Riveter

IP.com Disclosure Number: IPCOM000096209D
Original Publication Date: 1963-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Ellsworth, GE: AUTHOR

Abstract

This riveter is used to join thin sheet 1 of metal having a relatively low melting point to a thicker, underlying sheet 2 of metal having a melting point higher than that of sheet 1. As shown in the upper drawing, the juxtaposed sheets are placed on an anvil 7 of a percussive welder which can be of the type shown and described in U. S. Patent No. 3, 073,946.

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Percussive Weld Riveter

This riveter is used to join thin sheet 1 of metal having a relatively low melting point to a thicker, underlying sheet 2 of metal having a melting point higher than that of sheet 1. As shown in the upper drawing, the juxtaposed sheets are placed on an anvil 7 of a percussive welder which can be of the type shown and described in U. S. Patent No. 3, 073,946.

Rivet 4 is held above upper sheet 1 in welder electrode 3 by a projection on rivet head 4A. As electrode 3 is advanced to its operational position and then accelerated by devices including inductor 6 toward the surface of sheet 1, rivet 4 advances with it along line A toward sheet 1.

When the end of the rivet 4 shank is sufficiently close to the surface of sheet 1, current from charged capacitor 5 flowing via induction coil 6 and anvil 7 forms an arc between the lower end of the rivet shank and the upper surface of sheet 1. Owing to the thinness and relatively low melting point of sheet 1, the arc current burns a hole through the thickness of sheet 1. The arc is maintained between rivet 4 and the now-exposed surface of sheet 2 in order to heat the surface of sheet 2 immediately underlying the newly formed sheet 1 hole.

As the motion of electrode 3 and rivet 4 continues, the shank of rivet 4 is driven into and becomes welded to the part of sheet 2 adjacent the hole formed in sheet 1. Arc current amplitude and the accelerating force on electrode 3 are adjusted. This is to the point where...