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Home > Ordnance Documents and other related manuals > > Table 2. Current Settings for Mineral and Cellulose Coated Electrodes.
Table 1. Current Settings for bare And Lightly Coated Electrodes.
Figure 12. Starting the Arc

Welding Operations, I
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WELDING OPERATIONS I - OD1651 - LESSON 1/TASK 1
TABLE 2. CURRENT SETTINGS FOR MINERAL AND
CELLULOSE COATED ELECTRODES.
(4) In preparation for welding, the welding machine must be
adjusted to provide proper welding conditions for the particular
size and type of electrode being used.  These adjustments include
proper polarity, as well as current and voltage settings.
The
dual-control  machines  make  possible  the  separate  control  of
voltage and current that is delivered to the arc.
In single-
control units, the welding current is controlled manually while
the voltage is adjusted automatically.
(5) When proper adjustment of the welding machine is obtained,
the  exposed  end  of  the  electrode  should  be  gripped  in  the
electrode  holder  so  that  the  entire  usable  length  can  be
deposited, without breaking the arc.  In some cases, when welding
with long electrodes, the center of the electrode is bared and
gripped in the center.  Carbon and graphite electrodes should be
gripped short of the full length to avoid overheating the entire
electrode.
c.
Starting the Arc (figure 12 on the following page).
(1) The following are two methods used for starting the arc:
(1) the striking or brushing method shown in figure 12, view A,
and (2) the tapping method shown in figure 12, view B.  In both
methods,  the  arc  is  formed  by  short  circuiting  the  welding
current between the electrode and the work surface.  The surge of
high current causes both the end of the electrode and a small
spot on the base metal beneath the electrode to melt instantly.
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