TM-9-2350-261-34

CARRIER, M113A2, M577A2, M1064, M1068, M1059 AND M901A1

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL

TM-9-2350-261-34 - Page 126 of 785

TM 9-2350-261-34

PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS), INCLUDING

LUBRICATION INSTRUCTIONS — Continued

0014 00

2)

Lead angle and cant angle. Place gun at a lead angle of 10 deg to 15 deg off vertical. Point gun in direction of

weld travel for good gas coverage, cleaning, and preheating of material. Place gun at a cant angle of 90 deg. to

parent metal so filler wire and arc are directed towards apex of groove. This will give equal fusion on both

sides of material, even weld buildup, good gas coverage, and equal penetration.

3)

Nozzle clearance. Keep nozzle clearance of 1/2 to 5/8 inch (12 to 16 mm) for good gas coverage. Wrong

nozzle clearance will cause the following:

a)

Oxide deposits in the weld bead.

b)

Force gas bubbles into the weld.

c)

Prevent cleaning action on the material in front of the weld pool.

4)

Arc length. You will hear a smooth hissing or buzzing sound when the right arc length is struck.

5)

For further welding instructions, see TC 9-237.

0014 00-13