Sheet metal joint

1. A method for forming a sheet metal joint comprising the steps of:

punching a plurality of perforations in first and second metal sheets with a tang extending from each of the perforations;

disposing the first and second metal sheets in parallel relation; and

curling the tangs of the first metal sheet and the tangs of the second metal sheet together in opposite rotational directions.

2. The method of claim 1 wherein said punching step includes the step of:

directing the first and second metal sheets individually between a first roller having a plurality of punches and a second roller having a plurality of recesses to receive the punches.

3. The method of claim I wherein said curling step includes the steps of:

moving the first metal sheet around a third roller with the tangs extending away from the third roller;

moving the second metal sheet around a fourth roller with the tangs extending away from the fourth roller;

spacing the third and fourth rollers from one another such that the tangs of the first metal sheet and the tangs of the second metal sheet are overlapped and bent around one another during movement between the third and fourth rollers.