GTAW Welders often develop a technique of
rapidly alternating between moving the torch forward (to advance the weld pool)
and adding filler metal. The filler rod is withdrawn from the weld pool each
time the electrode advances, but it is always kept inside the gas shield to
prevent oxidation of its surface and contamination of the weld. Filler rods
composed of metals with a low melting temperature, such as aluminum, require
that the operator maintain some distance from the arc while staying inside the
gas shield. If held too close to the arc, the filler rod can melt before it
makes contact with the weld puddle. As the weld nears completion, the arc
current is often gradually reduced to allow the weld crater to solidify and
prevent the formation of crater cracks at the end of the weld.
More details, please feel free to contact us by email sales@chinatungsten.com.
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