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Continued set up of the MIG250/350/500 SWF Welder for MIG Welding
Crater Current Control Setting:
The purpose of the crater control setting is to be able to reduce of eliminate the crater that is left
behind at the end of the weld.
The Crater Current Control only works in 4T Trigger Function. The Crater Current Controls effectively allow
you to set an independent setting for wire feed speed and voltage to be used at the end of the weld,
(typically set at lower values than the main welding wire feed and voltage) to allow filling in of the crater at
the finishing of the weld. Typically the values are set at around 60% of the main welding current values.
In 4T Mode
The following steps explain how to set the and use the Crater Current Control.
(1) Select 4T on the Trigger Select Mode switch
(2) Set a value using the Crater Current dial on the front panel of the power source.
This dial controls the amount of wire feed speed delivered at the finish of the weld.
(3) Set a value using the Crater Voltage dial on the front panel of the power source.
This dial controls the amount of voltage applied at the finish of the weld.
Test the Crater Current settings by welding.
IMPORTANT: Remember to pay attention to the 4T trigger selection. This means that pulling the torch
switch (1T) will start the welding cycle, releasing the trigger switch (2T) will allow you to continue welding
without holding down the trigger, pulling the switch (3T) again and holding it down will allow the Crater
Current settings to step in and allow you fill in the weld crater, releasing the trigger (4T) will end the
welding. (This completes 4 actions of the trigger and this is why it is referred to as 4T)
If the Crater Current setting is too much, ie too hot and not filling the crater then reduce the setting and test
again. If the Crater Current setting is not hot enough and the welding is too cold with stabbing and spatter,
then increase the settings and test again.
(2) Set a value using the Crater Current
control dial on the front panel of the power
source
(1) Select 4T trigger function using the trig-
ger control function switch located on the
front panel of the power source.
(3) Set a value using the Crater Voltage dial
on the front panel of the power source.
