Welding Tech

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An arc welding process variation in which the current is pulsed to achieve spray metal transfer at average currents equal to or less than the globular to spray transition current.

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Any arc welding method in which the power is cyclically programmed to pulse so that the effective but short duration values of a parameter can be utilized. Such short duration values are significantly different from the average value of the parameter. Equivalent terms are pulsed voltage or pulsed current welding.

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Process is used mainly for welding aluminum and stainless steel. The method of controlling the transfer of the droplets by current pulses from the power source makes it possible to extend the spray range down. The process provides a stable and spatter free arc.

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Mode of metal transfer somewhat between spray and short circuiting. The specific power source has built into it two output levels: a steady background level, and a high output (peak) level. The later permits the transfer of metal across the arc. This peak output is controllable between high and low values up to several hundred cycles per second. The result of such a peak output produces a spray arc below the typical transition current.