Electric heating – Metal heating – For bonding with pressure
Patent
1981-07-21
1983-07-26
Goldberg, Elliot A.
Electric heating
Metal heating
For bonding with pressure
219 56, 219 7814, 219111, B23K 1132
Patent
active
043956157
ABSTRACT:
Apparatus for fabricating metal trusses having spaced preformed chord members of generally longitudinal predetermined length and cross-section joined by at least one preformed supporting web member of predetermined length and cross-section by electrically resistance welding together the chord and web member at a common region of contact with the chord member having a smaller cross-sectional area than the web member at the common region of contact. A device includes in to place a station for cleaning the chord and web members, means for moving the clean chord and web members to an assembly station for assembling the chord members in spaced relation joined by the web member. A device for passing the assembled truss along a support to the electrical resistance welder having opposed first and second electrodes of unequal resistance and adapted to releasably clamp the chord and web members respectively at the common region of contact. The welder has at least four pairs of approved electrodes to minimize distortion.
REFERENCES:
patent: 1707405 (1929-04-01), Lunn
patent: 2429186 (1947-10-01), Johnson
patent: 3158731 (1964-11-01), Cape
patent: 3288977 (1966-11-01), Keller
patent: 3899653 (1975-08-01), Spinnato
patent: 4262184 (1981-04-01), Cerutti
Metals Handbook 8th edition, vol. 6, Welding and Brazing American Society of Metals, Metals Park, Ohio, 1971, p. 413.
Kruse "Electronic Controls for Resistance Winding Machine" in Siemen Review XLIV 1977, #2, pp. 76-80.
Goldberg Elliot A.
Green Weldon F.
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