2 MMA WELDING
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© ESAB AB 2013
Voltage Reducing Device (VRD)
The VRD function ensures that the open-circuit voltage does not exceed 35 V
when welding is not being carried out. This is indicated by a lit VRD LED.
The VRD function is blocked when the system senses that welding has started.
If the VRD function is activated and the open-circuit voltage exceeds the 35 V
limit, this is indicated by an error message (16) appearing in the display and
welding cannot be started whilst the error message is displayed.
Contact an authorised ESAB service technician to activate the function.
2.3
Hidden functions MMA welding
There are hidden functions in the control panel.
To access the functions in A32, use the method button
.
To access the functions in A33 and A34, hold button
depressed for 5 seconds. The
display shows a letter and a value. The correct function is selected by pressing the buttons.
The knob is used to change the value of the selected function.
Control Panel
Function letter
Function
C
Arc Force
H
Hotstart
d
Drop welding
To leave the function in A32, hold the button
depressed for 5 seconds. For A33 and
A34, hold the button
depressed for 5 seconds.
Arc force
The arc force is important in determining how the current changes in response to
a change in the arc length. A lower value gives a calmer arc with less spatter.
Hot start
Increases the welding current during a fixed time at the start of the welding
process. Set the value of the hot start current by using the knob. This reduces
the risk of incomplete fusion at the start of the weld.
Drop welding
Drop welding can be used when welding with stainless electrodes. The function involves
alternately striking and extinguishing the arc in order to achieve better control of the supply
of heat. The electrode needs only to be raised slightly to extinguish the arc.