Eastwood MP200i Assembly And Operating Instructions Manual page 23

SHARPENING THE TUNGSTEN
To avoid contamination of the Tungsten and ultimately the weld, it is imperative to have
a dedicated grinding wheel used for Tungsten grinding only. A fine grit standard 6" syn-
thetic stone grinding wheel on a bench top grinder is sufficient, or a dedicated tungsten
grinder (#33307 Eastwood TG1800 Tungsten Grinder) is optionally available.
HEALTH HAZARD!
Dust and fine particles are generated while grinding which can
contain hazardous or toxic substances. Breathing this dust can
cause many serious respiratory health conditions. Always use
NIOSH approved respiratory protection while using a grinder.
EYE INJURY HAZARD!
Rapidly moving abrasive surfaces can eject metal particles, dirt and
debris at high velocity. Always wear ANSI approved eye protection
when operating a grinder.
• Turn the ON/OFF Switch [h] on the Rear Panel to the OFF position and unplug the
Welder from the power supply.
• Make sure the Tungsten and Torch are sufficiently cooled for handling, then
loosen and remove the Back Cap then the Collet and remove the Tungsten from
the FRONT of the Torch only (removing from the rear will damage the Collet).
• If the Tungsten is used and the end is contaminated, use pliers or a suitable tool
to grip the tungsten above the contaminated section and snap off the end of the
Tungsten.
• Holding the Tungsten tangent to the surface of the grinding wheel, rotate
the Tungsten while exerting light pressure until a suitable point is formed
(FIGS 19 & 20).
• The ideal tip will have the length of the conical portion of the sharpened area
at 2-1/2 times the Tungsten rod diameter (FIG 21).
• Replace the Tungsten in the Collet with the tip extending 1/8"-1/4" beyond
the Gas Nozzle, then re-tighten the Back Cap.
TIG SHIELDING GAS FLOW ADJUSTMENT
After connecting the Argon Regulator/Flowmeter, the gas flow rate needs to be adjusted
so that the proper amount of Shielding Gas is flowing over the weld. If there is too little
gas flow, there will be porosity in the resulting welds as well as excessive spatter.
If there is too much gas flow, this will be wasting gas and may affect the weld quality.
The included Regulator has 2 indicators on it; the gauge on the left is Flow Rate while
the gauge on the right is Tank Pressure.
• Open the TIG Shielding Gas tank valve all the way.
• After the Welder is turned on and set to TIG mode, the Trigger of the TIG Torch
(or Foot Pedal) will control the internal gas flow.
• As the unit is triggered, the Gas Flow needle will drop to a steady reading.
This is the value to be used for measuring Gas Flow.
• The Gas Flow should ideally be set to ~20 CFH while flowing. The CFH (Cubic
Feet per Hour) scale is the inside scale in red on the Flow Gauge. 20 CFH is the
most typical flow rate but it may need to be adjusted in some cases depending on
if there is a slight breeze or some other instance where additional shielding gas is
required to prevent porosity in the weld.
• When finished welding, the Valve on the Gas Bottle must be closed.
To order parts and supplies: 800.343.9353 >> eastwood.com
FIG. 19 FIG. 19
FIG. 20 FIG. 20
FIG. 21 FIG. 21
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