HTP Invertig 200, Owner'S Manual, Page: 8 / 20

7
Rear Panel Controls
1. On-Off Switch
This switch controls the input power to your Invertig Welder. 0
is off and 1 is on. When you turn the machine on, an indicator
lamp will be illuminated inside the On-Off Switch. This is an
indication your Invertig is on and ready for use.
Shield Gas
TIG welding requires a shield gas of 100% Argon. A shield gas
is used to keep the surrounding atmosphere from coming in
contact with the molten weld puddle. The correct flow rate is
enough gas to shield the molten weld puddle and protect the
tungsten electrode. Any greater flow rate is a waste of shield
gas. Usually, the flow rate will be set anywhere between 15 and
30 cubic feet per hour (cfh).
Use a gas regulator such as HTP Part #12020 which is
compatible with Argon cylinders and has a barbed fitting for the
delivery hose. Connect a gas hose to the gas fitting at the rear
of the machine and to the barbed fitting on the regulator.
Your Invertig welder comes with a gas hose that connects the
TIG welder to the 12020 gas regulator. The input gas fitting is
located in the back of the welder.
If you will be welding thick aluminum castings such as an
aluminum cylinder head, high purity helium can be used.
When welding thick aluminum sections like this and using
helium, to achieve added penetration it should be welded
in DC.
Tungsten Electrodes
With conventional transformer Tig welders, the general rule of
thumb is to use a pure tungsten (identified by a green tip) for
AC welding, and a 2% thoriated tungsten (identified by a red
tip) for DC welding. However, with an inverter Tig welder, the
ability to control the frequency and balance over a much wider
range allows you to use a 2% thoriated tungsten for both AC
and DC welding.
The electrode should be sharpened to a point with a fine
grinding wheel. If the stone used for sharpening the electrode is
not clean, contaminants could lodge in the electrode and
dislodge when welding. The grinding wheel used for tungsten
electrodes should not be used for any other materials. When
grinding the electrode to a point, a 15 to 30 degree angle is
desired. The grinding marks should run lengthwise with the
point, opposed to in the direction of the diameter.
General Welding Parameters
Following are some "rule of thumb" welding parameters
tungsten diameters and amperage settings for welding different
thicknesses of aluminum and steel. Keep in mind these are
general settings and the specific application may require more
or less power to get the job done.
Aluminum
Tungsten Machine Welding Filler
Thickness Diameter Amperage Amperage Diameter
.030" 1/16" 50 30-40 1/16"
.050" 1/16" 70 50-60 1/16"
.062" (1/16") 1/16" 80 65-75 1/16"
.093" (3/32") 3/32" 120 105-115 1/16"
.125" (1/8") 3/32" 150 125-135 3/32"
.187" (3/16")* 1/8" 170 150-160 3/32"
.250" (1/4")* 1/8" 200 180 3/32"
.312" (5/16)* 1/8" 200 200 3/32"
* May require beveling – depends on joint
Steel
Tungsten Machine Welding Filler
Thickness Diameter Amperage Amperage Diameter
.030" 1/16" 50 30-40 .035"
.050" 1/16" 70 45-55 .035"
.062" (1/16") 1/16" 80 55-65 1/16"
.093" (3/32") 1/16" 110 80-90 1/16"
.125" (1/8") 1/16" 130 110-120 1/16"
.187" (3/16")* 1/16"-3/32" 150 130-140 1/16"
.250" (1/4")* 3/32" 170 150-160 3/32"
.312" (5/16)* 3/32"-1/8" 200 170-180 3/32"
.375" (3/8)* 1/8" 200 200 3/32"
* May require beveling – depends on joint