ESAB Origo M13 Feed 304, Instruction Manual

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© ESAB AB 2002
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5.4 Function explanations
Burnback time
Burnback time is a delay between the time when the wire starts to brake until the
time when the power source switches off the welding voltage. Too short burnback
time results in a long wire stickout after completion of welding, with a risk of the wire
being caught in the solidifying weld pool. Too long a burnback time results in a
shorter stickout, with increased risk of the arc striking back to the contact tip.
Crater filling
Crater filling helps to avoid pores, thermal cracking and crater formation in the weld
when welding stops.
Figure 1 shows an interruption in the
welding, and a crack or crater opens up
readily in the solidified central part due
to shrinkage during the solidifying pro­
cess.
Fig. 1.After welding without crater filling
Figure 2 shows that the arc continues to
give off a certain amount of heat while
the weld pool is solidifying. This chang­
es the solidification process so that the
last solidified part of the weld pool ends
up at the top, and in this way it is possib­
le to avoid the occurrence of a crater.
Fig. 2.After welding with crater filling
2 stroke
With 2 stroke, wire feed starts when the trigger switch is pressed in and ends when
it is released.
4 stroke
With 4 stroke, the gas flow starts when the trigger switch is pressed in and the wire
feed starts when it is released. The welding process continues until the switch is
pressed in again, the wire feed stops and when the switch is released the gas stops
flowing.
Creep start
Creep start means that the wire is fed at low speed until it comes into electrical
contact with the workpiece and then the speed increases to the set speed.
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