Saturable core welding transformer

Claim 1

A WELDING TRANSFORMER COMPRISING, A MAGNETIC CORE HAVING AT LEAST THREE SUBSTANTIALLY PARALLEL LEGS JOINED AT RESPECTIVE ENDS, A PRIMARY WINDING CARRIED BY ONE OF THE TWO OUTER PARALLEL LEGS OF SAID CORE TO PRODUCE AN A.C. FLUX THERETHROUGH WITH A RETURN PATH THROUGH THE OPPOSITE OUTER PARALLEL LEG, A FIRST SECONDARY WINDING WOUND WITH SAID PRIMARY WINDING ON SAID ONE OF THE TWO OUTER PARALLEL LEGS, A SECOND SECONDARY WINDING CARRIED BY THE OTHER OF THE TWO OUTER PARALLEL LEGS, A SATURATION CONTROL WINDING CARRIED BY THE CENTRAL PARALLEL LEG OF SAID CORE TO PRODUCE A VARIABLE D.C. FLUX IN THE SAME DIRECTION IN THE TWO OUTER PARALLEL LEGS OF SAID CORE FOR SELECTIVE ADJUSTMENT OF THE EFFECTIVE A.C. FLUX IN SAID CORE, AND A THIRD SECONDARY WINDING SURROUNDING SAID PRIMARY AND SAID FIRST AND SECOND SECONDARY WINDINGS AND CONNECTED IN SERIES AIDING WITH SAID FIRST AND SECOND SECONDARY WINDINGS TO FORM A WELDING CIRCUIT.