Longevity WeldAll 160PI/200PI/250PI - Manual (Page 39)

160/200/250PI AC/DC Series IGBT Machine
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7. When finished welding always let the welder's fan run for a minute or two to cool the machine before turning
the power switch off.
Fig.1
Figure 1: Comparison chart of welds
Fig. 2
Length of Arc When an arc is too long, the metal melts off the electrode in large globules and the arc may
break frequently. This produces a wide, spattered, and irregular deposit with insufficient fusion between the
base metal and the weld. When an arc is too short, it fails to generate enough heat to melt the base metal
properly, causes the electrode Setting the length of an arc to stick frequently to the base metal, and produces
uneven deposits with irregular ripples. The recommended length of the arc is equal to the diameter of the bare
end of the electrode, as shown in figure 3.