| Patent Number |
Title Of Patent |
Date Issued |
| RE29016 |
Welding and forming method |
October 26, 1976 |
| A forming method in which members are forced together at an interface by causing parallel currents to flow in adjacent conductors, thereby forcing the conductors toward each other in a direction generally normal to the interface. |
| 4916278 |
Severing metal strip with high frequency electrical current |
April 10, 1990 |
| A method of severing a metal piece into parts in which electrical contacts engage the piece at the end of the severing line and high frequency electrical current is fed to the contacts for the length of time required to at least significantly reduce the tensile strength of the metal alon |
| 4845326 |
Apparatus and method for electrically butt welding of skelp edge faces which have been preheated |
July 4, 1989 |
| Method and apparatus for butt welding the edge faces of metal skelp which has been heated to a temperature of at least 1000.degree. F. but below the welding temperature of the metal of the skelp. The skelp is continuously advanced through a furnace in which the skelp is heated to such |
| 4508949 |
Method and apparatus for welding tapered metal poles |
April 2, 1985 |
| Methods and apparatus for manufacturing tapered, hollow metal poles which can be used for manufacturing poles of various lengths, tapers and cross-sectional dimensions with the same apparatus. A substantially complete, tapered tube is formed from a plate or sheet of metal having lips |
| 4326583 |
Heat exchanger panels |
April 27, 1982 |
| A method of removing ripples from the metal sheet portion of a heat exchanger panel element which is manufactured by joining a metal tube to a metal sheet by means of heated and cooled weld metal, and the product of the method. In the method, the sheet is corrugated, after the tube is |
| 4241284 |
Electrical contact apparatus for high frequency welding |
December 23, 1980 |
| Apparatus for supporting and feeding high frequency electric current to a pair of contacts for engaging a work piece or pieces and supplying current thereto in which a co-axial line has relatively movable inner and outer conductors with a pair of contacts respectively mounted at one end |
| 4215259 |
Surface hardening of metals using electric currents |
July 29, 1980 |
| Method and apparatus for modifying the surface properties of a metal part made of a metal which changes its properties with heating to a transformation temperature and subsequent cooling in which method electric current having a frequency of at least 3000 Hz is supplied to a pair of |
| 4207451 |
Multi-layered electrical induction coil subjected to large forces |
June 10, 1980 |
| An induction coil for the treating of metal parts where the coil carries large currents and is subjected to large forces. The coil has two layers of metal, the layer nearest the metal part being made of high conductivity and the other layer being made of a metal having an electrical |
| 4197441 |
High frequency induction welding with return current paths on surfaces to be heated |
April 8, 1980 |
| Methods of heating and welding together portions of a metal part or parts in which the portions are positioned in facing, generally parallel and spaced apart relation and an induction coil overlies the part or parts and is positioned so as to induce oppositely flowing currents in the par |
| 4192984 |
Embedment of hard particles in a metal surface |
March 11, 1980 |
| A method and apparatus for embedding in a surface area of a metal part a plurality of particles of a material having a melting point higher than, and mechanical properties different from, the metal of the part. The metal part is contacted with a pair of contacts, one at each end of the a |
| 4136272 |
Method of manufacturing heat exchange panels |
January 23, 1979 |
| Method for manufacturing heat exchange panels each comprising a plurality of sub-panels of finite length, each sub-panel comprising a metal tube welded to a metal sheet except at the end portions thereof which are secured to headers in fluid-tight relation thereto, in which method tubing |
| 4081648 |
High frequency in-line, electrical welding apparatus for small diameter metal tubing |
March 28, 1978 |
| In-line electrical welding apparatus for welding small diameter, thin-walled, metal tubing as it is advanced longitudinally comprising a high frequency electrical current source, a pair of upstream electrical contacts connected to one terminal of the source and a pair of downstream e |
| 3937914 |
Method and apparatus for manufacturing welded metal tubes of finite length |
February 10, 1976 |
| Methods and apparatus for manufacturing welded metal tubes of finite length in which an almost complete, axially split tube is advanced into a welding head where one edge face at one side of the split is accurately positioned and clamped and then the other edge face at the opposite side |
