Abstract: An induction heating coil for joining structural members by heating a bonding material disposed between the structural members includes first and second elements with complementary shapes spaced equidistantly apart along the length of opposing surfaces of the structural members. Bases and risers connected to the first element to a source of high frequency electrical current. Conductive elements connect the first and second elements into a single turn coil. The first and second elements, and at least the riser, are formed of hollow, tubular members to form a coolant flow path therethrough.

Abstract: A method of bonding two structural members, such as two metal sheets, by heating a bonding material disposed between juxtaposed perimeter edges of the two sheets. An induction heater is disposed adjacent one sheet surface and adjacent the juxtaposed perimeter edges of the two sheets to induce heat to the bonding material from one surface of one sheet and from the perimeter edges of both sheets to cure the bonding material. The induction heater is formed of first and second elements disposed in a non-parallel arrangement adjacent one surface and along one perimeter edge of two juxtaposed structural members. The first and second elements are joined together at adjacent ends. A base and a riser are connected to intermediate spaced ends of the first element for attaching the first element to a high frequency electrical current source.

Abstract: An induction coil for joining structural members by heating a bonding material disposed between the structural members. The induction coil includes first and second elements disposed in a non-parallel arrangement adjacent one surface and along one side edge of two juxtaposed structural members. In one embodiment, the first and second elements are joined together at adjacent ends. A base and a riser are connected to intermediate spaced ends of the first element for attaching the induction coil to a source of high frequency electrical current. The first and second elements, the base and the riser are formed of hollow, tubular members to form a coolant flow path therethrough.

Abstract: A programmable weld and machine controller for use in controlling a welding machine. The controller includes a central processing unit containing a stored control program connected to a memory which operates both the welding operation of the machine as well as the operation of the machine itself. The controller receives inputs from the machine in its various operational states as well as a data entry and display unit and a current monitor of the welding operation which generates outputs through a heat controlled output to activate a firing circuit to control the welding operation. Back-up of the memory program may be attained through an accessory port to a memory back-up storage unit.