Method for induction butt-welding metal parts, in particular par

Details Method for induction butt-welding metal parts, in particular par Method for induction butt-welding metal parts, in particular par

1980-04-04

1981-11-10

Goldberg, Elliot

Electric heating

Metal heating

Of cylinders

219 95, 219 1075, 219 1079, H05B 606, H05B 644

Patent

active

043000312

ABSTRACT:
Method of butt-welding metal parts by induction, in particular parts of irregular cross-section such as rails, consisting in pressing the parts against one another with an initial pressure for the entire period of heating, in heating them by induction by means of an inductor which encloses the parts parallel to their contours about the plane of their interface, firstly for a first period at a lower frequency and then, for a second period following the first, at a frequency two to four times higher than the first frequency, and, at the end of the second period, in applying the parts against one another at a forging pressure which is from two to more than six times higher than the initial pressure. The quality of the welded joint is greatly improved and the dimensions of the bulge or upset are limited by restricting the depth of the penetration of the induced current to both sides of the interface by means of two short-circuited turns disposed symmetrically relatively to the inductor to either side thereof.

REFERENCES:
patent: 2448690 (1948-09-01), Storm
patent: 2575604 (1951-11-01), Thompson
patent: 2590546 (1952-03-01), Kincaid et al.
patent: 2862092 (1958-11-01), Cowan
patent: 3202791 (1965-08-01), Gillock et al.
patent: 3414697 (1968-12-01), Rudd
patent: 3472987 (1969-10-01), Viart
patent: 3478156 (1969-11-01), Segsworth
patent: 3942090 (1976-03-01), Matthes et al.

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