Abstract: A seat back frame is disclosed which includes a tube member bent to form a generally rectangular frame member having first and second upright sides with generally parallel top and bottom ends with the ends being shorter in length than the upright sides. The tube ends are abutting one another and are welded together to close the frame member at the top end. A pivot member is coupled to the frame member adjacent a corner formed by one of the upright sides and the bottom end forming a first pivot for rotatably mounting the seat back frame to a lower seat cushion. An elongated weld plate is fixed to the other upright side of the frame member and extends in length more than half the length of the first upright side. The weld plate is U-shaped in cross section with the tubular upright side of the frame member being disposed in the open end of the U-shaped cross section and being welded thereto at several locations.