Contact wire for a roller seam welding machine

Details Contact wire for a roller seam welding machine Contact wire for a roller seam welding machine

1986-06-23

1989-01-03

Goldberg, E. A.

Electric heating

Metal heating

For bonding with pressure

219119, B23K 1106

Patent

active

047958758

ABSTRACT:
The contact wire (30) for a roller seam welding machine is provided on its front face with grooves (32) which are formed in the longitudinal direction of the wire and which are bounded by sharp longitudinal edges (34). The contact wire (30) is particularly well suited for welding metal sheets, the surfaces of which are heavily soiled or provided with coatings which are poor electrical conductors or electrically non-conducting. During the welding operation, the longitudinal edges (34) cut open the sheets to be welded or their oxide layer or coating which is a poor electrical conductor or non-conducting, and render possible a direct passage of the welding current to the actual metal sheet. Dirt as well as semi-plastic and vaporized coating material are reliably carried away to the front and rear in the longitudinal grooves so that the contact wire (30) cannot "float" during the welding operation. A preferred application for the contact wire (30) is the welding of fuel tanks from sheets which are coated so as to be poor electrical conductors or non-conducting on both sides, on a resistance roller seam welding machine.

REFERENCES:
patent: 1727166 (1929-09-01), Frick
patent: 3092712 (1963-06-01), Peras
patent: 3102945 (1963-09-01), Opprecht
patent: 3596043 (1971-07-01), Sporri
patent: 3842235 (1974-10-01), Opprecht

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