TM 5-1940-322-24
0178 00
WELDING INSTRUCTIONS (Contd)
NOTE
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,
NSN 9535-00-003-6946.
PREPARATION
1.
Position boat (1) so crack (2) is face-up for welding.
2.
Grind welding area and find ends of crack (2).
3.
Drill hole (3) at ends of crack (2) to prevent enlargement of crack (2). Use a drill with diameter
corresponding to half plate thickness.
NOTE
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
groove.
4.
Mill or grind a V-seam along crack (2) with a groove angle of 70 degrees.
5.
Clean welding area with a stainless steel wire brush.
WELDING
1.
If necessary, insert and clamp weld pool retainer plate under opening. Refer to TC 9-237.
2.
Finish weld area to be welded root, filler, and final pass welds. Refer to TC 9-237.
3.
Clean, treat, and paint area. Refer to WP 0176 00 or MIL-T-704 TYPE B.
0178 00-2
