TM 5-3805-280-24-2
Frame Installation
WELDING REPAIR OF MAJOR STRUCTURE
AWS-E70T-1 or E71T-1 wire electrode with flux
CAUTION: Avoid potentially toxic fumes and
core arc welding (FCAW) process.
dust. Hazardous fumes can be generated
when paint is heated by welding, soldering,
Weld Metal--Specification
or using a torch. Do all work outside or in a
well ventilated area. Dispose of paint and
Tensile Strength............................................. 482.6 mPa (70,000 psi)
Yield Strength ................................................ 413.7 mPa (60,000 psi)
solvent properly.
Elongation ..................................................................................... 22%
If you sand or grind paint, avoid breathing
the dust. Wear an approved respirator. If you
IMPORTANT: Area to be repaired must be
use solvent or paint stripper, remove
preheated to allow better weld
stripper with soap and water before welding.
penetration.
Remove solvent or paint stripper containers
and other flammable material from area.
3. To repair weld metal failure, remove failed weld
Allow fumes to disperse at least 15 minutes
metal using arc or grinding equipment. Thoroughly
before welding or heating.
clean area to be welded. Preheat structural
assemblies to a minimum of 38C (100F). Preheat
1. Remove paint before welding or heating.
ground engaging tools (cutting edges, skid shoes,
and teeth shanks) to 177C (350F).
IMPORTANT: Disconnect battery ground strap or
turn battery disconnect switch to
To repair base metal failure remove enough
"OFF". Also disconnect the wiring
material to allow weld to penetrate to the bottom of
harness connectors to the engine
crack. Preheat structural assemblies to a minimum
and pump controller.
of 38C (100F). Preheat ground engaging tools
(cutting edges, skid shoes, and teeth shanks) to
Have only a qualified welder do this
177C (350F).
job. Connect welder ground clamp
close to each weld area so electrical
Structural Assembly--Specification
current does not pass through any
bearings. Remove or protect all parts
Preheat Temperature...................................................... 38C (100F)
that can be damaged by heat or weld
17
splatter.
Ground Engaging Tool--Specification
1740
3
Preheat Temperature.................................................... 177C (350F)
2. Use one of the following weld processes:
AWS-E-7018 covered electrode with shielded
metal arc welding (SMAW) process.
AWS-ER-70S-3 wire electrode with gas metal arc
welding (GMAW) process.
TX,17,SB721 1919SEP981/1
17-3
