Process for forming welded prepainted metal appliance cabinet wa

Details Process for forming welded prepainted metal appliance cabinet wa Process for forming welded prepainted metal appliance cabinet wa

1982-06-14

1984-07-24

Envall, Jr., Roy N.

Electric heating

Metal heating

For bonding with pressure

219 869, 312214, B23K 1114, F25D 2306

Patent

active

044619430

ABSTRACT:
A process for forming metal walls for prepainted metal cabinets and the like, such as by welding a galvanized back panel to a prepainted metal refrigerator-freezer cabinet wrapper painted only on the exterior wall surface thereof, and wherein flange sections functioning as marginal edge portions of the wall are folded over from the wrapper side walls. These flange sections are deformed to form recessed inwardly projecting bead portions therein along the edge portions, with paint either removed from the contact surfaces of the interiorly facing bead portions or not present thereon because of the manner in which the flange is formed. A back panel, with projecting bead portions arranged along the edges thereof which face exteriorly, is disposed with its edges lapping the flange portions of the wrapper sufficiently to cover bead portions thereon, with the beads in the panel projecting toward and in contact with the oppositely projecting beads of the flange section. A pair of series connected electrodes are then utilized to apply the welding current, one electrode being in contact with the bead surface on the flanges of the wrapper and the other being in contact with the wall of the panel opposite a bead portion formed therein.

REFERENCES:
patent: 1020056 (1912-03-01), Rietzel
patent: 1085769 (1914-02-01), Thomson
patent: 4223965 (1980-09-01), Palandrani

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