Matco Tools MP200STDVI Owner's Manual page 15

chemical reaction. The burning coating, however, forms slag. The slag formation appears as an
accumulation of dirty metal scale on the finished weld. Slag should be removed by using a chipping
hammer.
PEENING THE SLAG FROM A WELD JOINT CAUSES SMALL CHIPS OF METAL TO FLY
THROUGH THE AIR! Metallic chips flying through the air can cause eye injury or injury to
other parts of the head, hands or exposed portions of the body. Wear goggles or safety
glasses with side shields and protect the hands and other exposed parts of the body with
protective garments, or if possible, work with a shield between the body and the work piece.
The intense heat produced at the arc sets up strains in the metal joined by welding. Peening the
weld not only removes the scale left behind in the welding but relieves the internal strains developed
by the heating and cooling process.
DC TIG OPERATION
High voltage danger from power source! Consult a qualified electrician for proper
installation of receptacle at the power source. This welder must be grounded while in use to
protect the operator from electrical shock. If you are not sure if your outlet is properly
grounded, have it checked by a qualified electrician. Do not cut off the grounding prong or
alter the plug in any way and do not use any adapter between the welder's power cord and
the power source receptacle. Make sure the POWER switch is OFF then connect your
welder's power cord to a properly grounded 120 VAC, 60 Hz, single phase, 20 amp power
source.
EXPOSURE TO A WELDING ARC IS EXTREMELY HARMFUL TO THE EYES AND SKIN!
Prolonged exposure to the welding arc can cause blindness and burns. Never strike an arc
or begin welding until you are adequately protected. Wear flame-proof welding gloves, a
heavy long sleeved shirt, trousers without cuffs, high topped shoes, and an ANSI approved
welding helmet.
Be aware that the TIG torch will be electrically LIVE when the Input Power Switch on the welder is
turned on.
1. Remove the ground cable and the electrode holder from the weld output connections. Install
the ground cable to the Positive (+) weld output connection.
2. Secure the ground clamp to the work piece.
3. Connect a regulator to a bottle of ARGON gas. Then connect the gas connection from the
TIG torch to the regulator.
4. Connect the TIG torch weld cable to the Negative (-) weld output connection.
5. Set desired amperage on the amperage control knob on the front panel of the welder.
6. Turn on the input power switch on the welder.
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