WELDING INSTRUCTIONS (Contd)
If there are several cracks or holes within a damaged area, repair
must be performed by removing damaged area and welding in a
new sheet metal plate, P/N AMS-QQ-A-25014,
Position boat (1) so crack (2) is face-up for welding.
Grind welding area and find ends of crack (2).
Drill hole (3) at ends of crack (2) to prevent enlargement of crack (2). Use a drill with diameter
corresponding to half plate thickness.
If crack is open 0.098 in. (2.5 mm) or more, and additional
permanent weld pool retainer is required. For this retainer, use a
metal strip 1 in. (25.4 mm) or more in width and with a milled
Mill or grind a V-seam along crack (2) with a groove angle of 70 degrees.
Clean welding area with a stainless steel wire brush.
If necessary, insert and clamp weld pool retainer plate under opening. Refer to TC 9-237.
Finish weld area to be welded root, filler, and final pass welds. Refer to TC 9-237.
Clean, treat, and paint area. Refer to WP 0176 00 or MIL-T-704 TYPE B.