Gas Purge, Cold Wire Feed And 2--Stroke/4--Stroke - ESAB PUA 1 Manual

Hot Start
The hot start function is selected when a hotter arc is necessary at weld start, so that
welding defects are avoided at the beginning of a weld.
Crater Fill
The crater fill function makes it easier to avoid porosity and crater cracking in the
weld metal when you stop welding.
Creep Start
The creep start function gives a lower wire feed speed and can be used to maintain
the best possible start. The creep start speed is 50% of the set wire feed speed. The
function is activated as the default setting.
TIP! The hot start, creep start and crater fill functions can be switched on or off using
the "soft buttons," see the section on "MIG" configuration under section 9.2.4.2.
The start data and stop data menus are used to set the values for the following
parameters.
Gas Pre- - and Post- -Flow
The parameters gas pre--flow and gas post--flow specify the length of time that the
gas continues to flow before and after welding.
Burnback Time
Burnback time is used to adjust the length of the electrode after welding.
2.6 Gas Purge, Cold Wire Feed and 2- -Stroke/4- -Stroke
The following three functions can be controlled with soft button (as can functions
such as hot start). For a description of how this is done, see "MIG configuration"
under section 9.2.4.2.
Gas purge
The gas purge function is used to fill the gas hoses with shielding gas, or for
measurement of gas flow. When the button is pressed, gas purging starts; when it is
released, gas purging stops.
Cold Wire Feed
This function is used to feed wire out manually when threading a new spool of wire.
When the button is pressed, the wire is fed forward; when the button is released,
wire feed stops.
2- - Stroke or 4- -Stroke
During MIG welding the torch button can function in two ways/ 2--stroke or 4--stroke.
The switching function for 2--stroke/4--stroke can be set on one of the soft buttons.
The difference between 2--stroke and 4--stroke is illustrated in the following figures,
along with other functions of the start and stop cycles.
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