B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
327/18
B23K 13/00 (2006.01) B23K 13/02 (2006.01) H05B 6/02 (2006.01)
Patent
CA 1133072
ABSTRACT OF THE DISCLOSURE 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 with the spacing between the portions not greater than five times the thickness dimension of one of the portions. By means of induction coil or loop means, oppositely flowing currents having a frequency of at least 3000 Hz are caused to flow in such portions until welding temper- ature is reached at which time the portions are pressed together to form a weld therebetween. The spaced portions may be moved in the direction of their widths during the flow of the currents and pressed together at a downstream weld point to perform continuous welding or if the portions are on the ends of shafts or tubes, such shafts or tubes may be rotated during the flow of currents to produce a weld between the ends. If the coil or loop means is a continuous conductor, at least two portions of the conductor extend on oppos- ite sides of and generally parallel to the portions to be heated and are spaced from the latter by a distance at least equal to ten times the refer- ence depth of the currents in at least one of said portions to be heated. Similar results may be obtained by supplying the currents to one of the por- tions to be heated through a pair of conductors connected to contacts at the ends of the one portion and positioning at least a portion of one of the con- ductors generally parallel to the other portion to be heated and spaced from the other portion by a distance at least equal to ten times the reference depth of the currents in the other portion.
321309
Smart & Biggar
Thermatool Corp.
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