TOPIC 5. WELDING REPAIR PROCEDURE

TM 10-3930-644-14&P

TOPIC 5. WELDING REPAIR PROCEDURE

For various applications in the mast and carriage

assemblies, specially treated metals are used. Care

must be taken when these metals are repaired or

replaced by welding. Figures 22 thru 24 illustrate the

manner in which the welding is to be performed.

Prepare welding surface by removing all foreign material

such as rust, scale, grease, etc. Any part that may be

damaged by heat should be removed before welding.

After welding is completed, remove all slag, weld spatter

and excessive weld material.

REPAIR WELDING

CARRIAGE

AND

MAST

ROLLER STUDS

Process ......................................... Shielded Metal Arc

Figure 22. Roller Stud Welding Procedure

Equipment ......................................................... Manual

Settings:

Current ....................................................... A.C.

Amps ................................................ 275/325

Volts......................................................31/33

Base Metals ..........................................(1) AC 1035-P1

(2) AC 86-L-20-H (roller stud)

Plate Thickness Range ..................................... 3/8" - 1"

Electrode:

Type........................................................... Stick

Class ................................E 7018 (hydrogen free)

Size ........................................................... 3/16"

Flux .......................................Electrode Covering

Weld Type and Size ....................................... 1/4" Fillet

Number of Passes ...................................................... 1

Position ...................................................... Horizontal

Preheat ............................................................ 400F

Interpass ............................................................ 250F

Postheat ............................................................. None

B. INSPECTION

1. Finished weld to be magnafluxed for defects.

2. The weld defect shall be explored by removing

material with a pencil grinder in 0. 010" - 0. 020"

Figure 23. Carriage Roller Stud Location

deep passes (length to depth ratio of 4:1).

(Canted Roller Type)

Visually inspect for detect alter each pass and

magnaflux to confirm disappearance.

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