The rocker arm welder takes its name from the pivoting arm that carries the upper electrode. As the operator actuates the machine – by foot pedal, air cylinder, or servo – the arm rocks downward, bringing the upper electrode into contact with the workpiece stacked on the lower electrode. The pivoting action produces a follow-through motion that maintains electrode contact as the weld nugget forms and cools, ensuring consistent fusion even as the metal softens under the welding current. This follow-through characteristic makes rocker arm machines particularly well-suited to thinner gauge materials where electrode bounce or premature separation would compromise weld quality. Available in AC and MFDC configurations.
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