ET 201i DC
OPERATION
0-5452
4-4
Output Scale for 208/230V
The outside number scale identifies the available output weld current for STICK or LIFT TIG/HF TIG weld modes.
Nuisance tripping should not occur on a 50A 208/230V outlet for both STICK & LIFT TIG/HF TIG Modes.
Art # A-10443_AB
20 Amp Outlet
15 Amp Outlet
Output Scale for 115V
Output Scale for 230V
M
SMAW
GTAW
15A
SMAW
20A
115V
50A
S AW
GTAW
208/
230V
4.04 STICK (SMAW) Electrode Polarity
Stick electrodes are generally connected to the "+" Positive Output Terminal and the work lead to the "−" Negative Output
Terminal but if in doubt consult the electrode manufacturers literature for further information.
4.05 Effects of Stick Welding Various Materials
High Tensile and Alloy Steels
The two most prominent effects of welding these steels are the formation of a hardened zone in the weld area, and, if
suitable precautions are not taken, the occurrence in this zone of under-bead cracks. Hardened zone and under-bead
cracks in the weld area may be reduced by using the correct electrodes, preheating, using higher current settings,
using larger electrodes sizes, short runs for larger electrode deposits or tempering in a furnace.
Manganese Steels
The effect on manganese steel of slow cooling from high temperatures is to embrittle it. For this reason it is absolutely
essential to keep manganese steel cool during welding by quenching after each weld or skip welding to distribute the
heat.
Cast Iron
Most types of cast iron, except white iron, are weldable. White iron, because of its extreme brittleness, generally cracks
when attempts are made to weld it. Trouble may also be experienced when welding white-heart malleable, due to the
porosity caused by gas held in this type of iron.
Copper and Alloys
The most important factor is the high rate of heat conductivity of copper, making pre-heating of heavy sections neces-
sary to give proper fusion of weld and base metal.
Types of Electrodes
Arc Welding electrodes are classified into a number of groups depending on their applications. There are a great
number of electrodes used for specialized industrial purposes which are not of particular interest for everyday gen-
Figure 4-2: Current Control for ET 201iDC
