TM 5-5420-278-24&P0068 000068 00-2RAMP BAY AND INTERIOR BAY CRACK REPAIR (Contd)NOTEIf there are several cracks or holes within a damaged area, repairmust be performed by removing damaged area and welding in anew sheet metal plate, P/N AMS-QQ-A-25014, NSN 9535-00-003-6946.IRB bays are made from corus aluminum ABKANTGUETE6061-T651 749572.PREPARATION1.Position ponton (1) so crack (2) is face-up for welding.2.Grind area and find ends of crack (2).3.Drill a hole (4) at ends of crack (2) in order to prevent enlargement of crack (2). Use a drill withdiameter corresponding to half the plate thickness.NOTEIf crack is open 0.098 in. (2.5 mm) or more, and additionalpermanent weld pool retainer is required. For this retainer, use ametal strip 1 in. (25.4 mm) or more in width and with a milledgroove.4.Mill or grind a V-seam along crack (2) with a groove angle of 70 degrees. 5.Clean area to be welded with a stainless steel wire brush.WELDING1.If necessary, insert and tack weld retainer (3) (refer to TC 9-237).2.Finish weld area to be welded root, filler, and final pass welds (refer to TC 9-237).3.Perform ponton leak test (WP 0059 00). Reweld if necessary.4.Clean, treat, and paint area per MIL-T-704 TYPE B.5.Remove leak detector kit (WP 0059 00).6.Connect outer ponton and inner ponton (WP 0023 00 or WP 0042 00), if separated.7.Install ramp bay or interior bay on transporter (TM 5-542-278-10).
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