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June 1995
Form:
OM-171 108A
OWNERS
MANUAL
MWTIG
Read and follow these instructions and all
safety
blocks
carefully.
Have
only
trained and
qualified
persons
install, operate,
or
service this unit.
Call your distributor
if
you
do
not
understand
the
directions.
L._
1~oLsfi
Give this
manual
to
the
operator.
For
help,
call
your
distributor
cover
5/94
ST-
800 877
PRINTED IN USA
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Summary of Contents for MAC TOOLS MWTIG
- Page 1 June 1995 Form: OM-171 108A 1~oLsfi OWNERS MANUAL MWTIG Read and follow these instructions and all Give this manual operator. blocks safety carefully. Have only trained and qualified persons call help, distributor your install, operate, service this unit. Call your distributor understand directions.
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Page 2: Emf Information
SAFETY PRECAUTIONS FOR GTAW TORCHES WARNING GTAW WELDING be hazardous. PROTECT YOURSELF AND OTHERS FROM POSSIBLE SERIOUS INJURY OR DEATH. KEEP CHILDREN AWAY. PACEMAKER WEARERS KEEP AWAY UNTIL CONSULTING YOUR DOCTOR. taken. The welding, in most certain hazards is safe when precautions jobs, Welding... -
Page 3: Safety Information
SECTION SAFETY INFORMATION modl.l 2/93 Read safety throughout this manual. messages Obey safety avoid injury. messages of WARNING and CAUTION. Learn the meaning Safety Alert Symbol Signal Word WARNING possible death means klIl.~~ r r ~ ~ & v I :1~II~c~ serious injury... -
Page 4: Operating Ranges
Table 2-2. Recommended Safe Operating Ranges MW 100 MW 130 MW 150 MW 250 High Tap Low Mm. 125 A Range 80 A Range Range Range 105 A Low Max. 85 A Range 115 A 155 A 130 A Range Range Range 105 A... -
Page 5: Section 3-Installation & Operation
SECTION 3-INSTALLATION & OPERATION Torch Parts And Torch 3-1. Required Assembly Obtain the following parts (see Torch Parts Required Section Electrode (See Tungsten Section Collet Body Standard Collet Assembiing Torch Body Torch Body Heat Shield Backcap (Long Backcap Shown) 0-Ring Instaliing Tungsten adjust tungsten position, loosen... - Page 6 3-2. Connecting Torch READ SAFETY BLOCKS beginning of manual before proceeding. BUILDUP OF SHIELDING GAS harm health kill. Shut off shielding when supply not in use. waml.1 9/91 Turn Off welding Welding Power Sources Using Friction Terminai Lead Connections power source, and disconnect input...
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Page 7: Operation
Trigger Press in contactor tngger pull and start gas flow. While trigger pressed, use scratch method start to start an arc. for proper extinguish arc, posthow cooling, momentarily release and repress trigger aboUt seconds. ST-800 Figure 3-3. Operation SECTION MAINTENANCE & TROUBLESHOOTING Figure 4-1. -
Page 8: Tungsten Electrode
SECTION 5 TUNGSTEN ELECTRODE mod2.1 1/94 NOTE ~ Wear clean contamination of electrode. gloves prevent tungsten 5-1. Selecting Tungsten Electrode Table 5-1. Size Tungsten Amperage Range Type Polarity Electrode Diameter Electrode Electrode Argon Argon Argon Using Argon Balanced Negative/Straight Polarity Positive/Reverse Polarity High Frequency... -
Page 9: Preparing Tungsten
5-2. Preparing Tungsten Tungsten Electrode Balled End Ball end of before tungsten welding by applying either an ac amperage than what is slightly higher recom O~IIE 1-1/2 Times mended for electrode di- given Electrode Diameter Table ameter (see 5-1), or a electrode positive amperage. -
Page 10: Parts List
SECTION 6-PARTS LIST ST-800 Figure 6-1. Complete Assembly Item Part Description Quantity Figure 6-1. Complete Assembly 171 110 TORCH BODY AIR COOLED 171 111 POWER CABLE ASSY 12 FT W/SPEC FITTINGS BACKCAPSHORT ...4 171 113 0-RING FOR BACK CAP 171 114 CUP GASKET 171 115 171 117...
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