TM 5-3431-225-15
HEADQUARTERS
T ECHNICAL M A N U A L
DEPARTMENT OF THE ARMY
WASHINGTON , D.C., 7 MARCH 1969
No. 5343122515
Operator, Organizational, Direct and General Support
and Depot Maintenance Manual
WELDING MACHINE, ARC: GENERAL AND INERT GAS
SHIELDED TRANSFORMER; 300 AMP; 5 TO 460 AMP AC;
5 TO 350 AMP DC (MILLER MODEL 330A/B/SP)
FSN 3431-620-0858
Page
Paragraph
C HAPTER
1. INTRODUCTION
Section
I. General . . . . . . . . . . . .. . . . . . .
C HAPTER
2-12-5
Section
I. Service upon receipt of equipment . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . 2-12-5
II. Movement to a new worksite . . . . . . . . . . . . . . . . .
. . . . . . . 2-6,2-7
III. Controls and instruments . . . . . . . . . . . . . . .
.....
IV. Operation of equipment . . . . . . . . . . . . . . . .
......
2-10--2-13
V. Operation under unusual conditions . . . . . . . . . . . .
......
2-14--2-18
Section
I. Operator and organizational maintenance tools and equipment . . . . . . . 3-1,3-2
II. Lubrication . . . . . . . . . . . . . . . . . . .
III. Preventive maintenance services . . . . . . . . . . . . . . .
3-4--3-6
IV. Operator's maintenance . . . . . . . . . . . . . . . . . . . .
V. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11--3-20
VI. Field expedient repairs . . . . . . . . . . . . . . . . . . . . . . . . . .
3-21--3-24
VII. Welding machine top, housing, doors, and panels . . . . . . . . . . . . . . . . . . . 3-25--3-27
3-8--3-12
VIII. Fuses, switches, timers and remote receptacles . . . . . . . . . . . . . . . . 3-28--3-42
IX. Spark gap assembly, voltage change bars, and ground and electrode terminal
board . . . . . . . . . . . . . . . . . . . . . . . .
3-43--3-46
X. Gas and water solenoid valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-47-3-49
3-19,3-20
XI. Ventilating cooling system . . . . . . . . . . . . . . . . . . . . . . . . .
3-50--3-54
C HAPTER
INSTRUCTIONS
Section
I. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1,4-2
II. Description and data . . . . . . . . . . . . . . . . . . . . . . . . . . .
III. Special tools and equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5--4-7
4-2,4-3
IV. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-84-15
V. Control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
VI. Range and polarity switch, control rheostat, intensity selector rheostat, start
4-44-6
adjustment rheostat, and TIG-metallic switch . . . . . . . . . . . . .
4-174-21
4-8,4-9
VII. Rectifier assembly, control rectifier, capacitors, and resistors . . . . . . . 4-22--4-25
VIII. Relays, high frequency panel, high frequency transformer, control transformer,
4-13-4-15
main transformer, magnetic amplifier, and stabilizer . . . . . . . . . . . . . . . . . . . 4-264-33
IX. Wiring assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-34,4-35
X. Frame and main transformer support assembly . . . . . . . . . . . . . . . . . . . . . . 4-36,4-37
C HAPTER
I. Demolition of the welding machine to prevent enemy use . . . . . . . . . . . . . . . . . . . 5-1--5-5
Section
II. Shipment and limited storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6--5-9
A
A. REFERENCES . . . . . . . . . . . . . . .
...........
PPENDIX
BASIC ISSUE ITEMS LIST . . . . . . . . . .
...........
MAINTENANCE
ALLOCATION
CHART
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INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . I-1
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