Weldmatic 200i AC/DC
Model No MC105, Iss A 02/16
17
D
x
Fig 9
AC Advanced Preparation
x = 1.5 to 4 times diameter
Fig 10
Correct Grind Direction
Fig 11
Incorrect Grind Direction
D
30°
30°
x
Fig 8
Tungsten Preparation
x = 1.5 to 4 times diameter
(2 x D = 30° included angle)
Tungsten Current Ranges
Electrode
Diameter (mm)
Gas
Cup Size
DC
Current Amps
AC
Current Amps
Filler Wire
Diameter (mm)
1.0
6
15-80
20-60
1.6
1.6
6
70-150
50-100
1.6-2.4
2.4
8
150-250
100-160
2.4-3.2
Safety Consideration Thoritated
Tungsten.
Thoriated Tungsten contains the element
Thorium (Th). Thorium is a radioactive
element which mainly emits alpha
particles. Alpha particles cannot penetrate
skin, or clothing, but can be a harmful
carcinogen if released inside the digestive
tract, or lungs.
There is almost no release of radioactive
material during arcing.
There is no significant hazard in handling
and storage. The Thoria is inside the
tungsten electrode, it is enclosed in a
tungsten matrix and so there is little
radiation emitted externally.
The greatest risk of exposure is during
the grinding of the thoriated tungsten
electrodes. Care needs to be taken, to
control the dust. A dust mask should be
worn, and grinder area clean up should
be done with a vacuum cleaner.
