TM 9-2350-277-20-4REPAIR HULL BY WELDING — Continued 0529 007. When welding unequal sections, direct arc against heavier piece to fuse the two edges evenly. Watch weld pool edgerather than arc to make sure weld pool edges fuse right.8. When performing multi-pass welding, make sure edges of weld pool fuse right. Watch weld pool rather than arc. Anyoscillating or weaving motion should be slight, smooth, and slow. Brush material with clean, stainless steel wire brushafter each pass. On small weldments, lower amperage slightly after each pass if welding members become too hot.9. Clean up weld area and touch-up paint all bare metal (see TM 43-0139).10. Install any parts removed for access.MIG WELDING METHOD1. MIG (Gas Metal Arc Welding) uses a dc power source, control panel, and welding gun. The gun feeds a consumablebare electrode at a given rate into a molten pool beneath a blanket of inert gas. When an arc is struck, a molten poolforms at once. Move the welding gun along the joint line at a rate that shapes the right size bead. The covering of inertgas keeps air from polluting the weld zone. No flux is needed.2. Lead angle and cant angle are important. Place gun at a lead angle of 10to 15off vertical. Point gun in direction ofweld travel for good gas coverage, cleaning, and preheating of material. Place gun at cant angle of 90to parent metal sofiller wire and arc are directed toward apex of groove. This will give equal fusion to both sides of material, even weldbuildup, and equal penetration.0529 00-5
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