Method for fabricating open web steel joists

Details Method for fabricating open web steel joists Method for fabricating open web steel joists

Filed on

1981-07-21

Date issued

1983-12-20

Examiner

Goldberg, Elliot A.

Patent Class

Electric heating

SubClass

Metal heating

SubSubClass

For bonding with pressure

Other Related Categories

219 58, 219 79, B23K 1132

Type

Patent

Status

active

Patent number

044219695

Description

ABSTRACT:
In the method of welding open web steel joists a chord member is formed by bending a web in an undulating configuration. The chord is welded to the webs by simultaneously clamping and resistance welding to form four welds. The weld current is applied by a series of time controlled intermittent impulses of electrical current. The weld electrodes used are of unequal resistance so as to balance the heat generated.

REFERENCES:
patent: 2429186 (1947-10-01), Johnson
patent: 3899653 (1975-08-01), Spinnato
patent: 4262184 (1981-04-01), Cerutti
Metals Handbook, 8th Edition, vol. 6, Welding and Brazing, American Society for Metals, Metals Park, Ohio, 1971, p. 413.
Kruse, "Electronic Controls for Resistance Welding Machine", Siemens Review XLIV #2 (1977).

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