The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 22, 1988
Filed:
Dec. 08, 1986
John F Farrow, Plymouth, MI (US);
Medar, Inc., Farmington Hills, MI (US);
Abstract
A method of and structure for high speed seam welding. The method comprises placing an auxiliary transformer between a three phase source of electrical welding energy and seam welder structure, which auxiliary transformer includes three separate primary windings connected to the separate phases of the source of welding energy, phase controlling the energizing of each separate primary winding and energizing the seam welder from the auxiliary transformer. In one embodiment, the phases of the auxiliary transformer are energized in the order of the phase of the welding energy and a delay of approximately 120.degree. of the welding energy is provided between the energizing of each auxiliary transformer winding. In another embodiment of the invention, the auxiliary transformer primary windings are energized in a first, third, second, welding energy phase order with a delay of 240.degree. of the welding energy between energizing each primary coil winding to provide a substantially 60/40, on/off auxiliary transformer energizing. The structure of the invention may include an auxiliary transformer secondary winding connected to the primary winding of a seam welder welding current transformer or a seam welder welding current transformer having a primary winding connected in parallel with one of the three primary windings of the auxiliary transformer or an auxiliary transformer including a secondary winding connected directly to the seam welder structure.