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16
Razor2OOAC/DC TIG-ARC
Razorweld
Continued - Set Up Procedure for ARC (Stick) Weld-
6) Connect the Earth Clamp securely to
the work piece or the work bench.
4) Place the electrode into the electrode
holder and clamp tight.
5) Strike the electrode against the work
piece to create and arc and hold the elec-
trode steady to maintain the arc
6) Hold the electrode slightly above the
work piece to maintain the arc while
travelling at an even speed to create and
even weld deposition.
7) To nish the weld, break the arc by
quickly snapping the electrode away from
the work piece.
8) Wait for the weld to cool and carefully
chip away the slag to reveal the weld
metal below.
ARC FORCE - What is the Arc Force Control and what does it do?
During welding arc voltage drops as the arc gets tighter and can cause the electrode to stick/short circuit to the work piece. Arc
force should be set according to the electrode diameter, electrode type, welding current and the technical requirement. When you
set the arc force high the machine senses the drop in voltage, as the electrode is about to stick/short circuit to the work piece the
machine responds by increasing the arc voltage and welding current momentarily (per millisecond). This boost in arc voltage/cur-
rent blasts away base metal and electrode to prevent the electrode from sticking itself to the work piece. High arc force means
the molten droplet from the melting electrode is larger with quicker transistion preventing the electrode from sticking, however too
much arc force may create excessive spatter. Low arc force will result in a softer arc with minimal spatter and a nice shaped weld
bead, however it may lead to the electrode sticking to the work piece easier, therefore the arc force should be adjusted to provide
a smooth arc transistion between the electrode and workpiece without it sticking and without providing excessive spatter. Higher
Arc Force is more suited to thicker electrodes under low amperage settings, out of postion welding, low hydrogen type electrodes
where a forceful arc characteristic is preferred to maintain the arc and better control penetration. Lower Arc Force is better suited
to hardfacing and cast Iron electrodes where a soft buttery arc is preferred to prevent the electrode material diluting too much with
the base metal.
IMPORTANT NOTES - For ARC (Stick) Welding
ELECTRODE POLARITY - What is the electrode polarity and why is it important.
When using a DC power source, the question of whether to use electrode negative or positive polarity arises.
The rst important point is that not all electrodes can be used with all polarities. Electrode manufacturer information and specications such as
BS EN ISO 2560:2005 and AWS A5.1-2004, dene the polarity with which dierent electrodes may be used. The choice of polarity also depends
on the type of the material and joint design. A welding procedure should specify the polarity to be used for the electrode choice and joint
design.
-
-

With DC electrode (+) positive (reverse) polarity, more heat is generated at the workpiece. This produces welds with deep penetration and a
narrower weld bead and can reduce the incidence of lack-of-fusion defects in the weld.
DC electrode (-) negative (straight) polarity generates more heat at the electrode and produces welds with shallower penetration. DC (-) nega-
tive electrode results in a higher burn o rate, and therefore a higher deposition rate at a given current. It is often used for welding thin sheet
materials, or joints with poor t-up, where more control of the weld pool is needed due to the increased risk of burn through.
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