Lincoln Electric W000315558, Инструкция по технике безопасности, эксплуатации и обслуживанию

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8695 5535 / L
RDM PLASMA
C-3
C- DESCRIPTION
1 - REMINDER
With automatic keyhole plasma welding, any of the following defects may occur if the arc
is switched off suddenly with no precaution:

The plasma jet hole remains.

The hole disappears but the high plasma gas flow and the decreasing intensity leads
to gouging in the metal that is being solidified, with the appearance of blow holes.
These defects are not generally critical in the case of longitudinal welding, as the weld
bead often starts and ends on end plates. But they are not acceptable in circular welding. In
that case, you must use a gas flow programmer, which is used to control the decrease in the
flow of plasma gas for a given welding cycle, in order to eliminate the defects described
above in a reliable and reproducible way.