Welding apparatus and method

Details Welding apparatus and method Welding apparatus and method

1989-08-03

1992-09-08

Seidel, Richard K.

Metal fusion bonding

Process

Preplacing solid filler

B23K 3102

Patent

active

051451069

ABSTRACT:
A welding apparatus and method characterized by an electrically activated high temperature igniter with a pair of lead wires adapted to be connected to a high energy source of current and a high resistance bridge between the leads. The bridge is coated with an ignition material comprising a mixture of fine aluminum, one or more metal oxides or oxygen containing compounds and a binder. The welding apparatus has a vessel filled with exothermic material. When the lead wires are supplied with a high energy electrical current, the lead wires cause the ignition material to ignite in turn causing the exothermic material to ignite. If the coated bridge wire is positioned above the exothermic material, the igniter will broadcast multiple points of ignition over the top of the exothermic material.

REFERENCES:
patent: 3308532 (1967-03-01), Long et al.
patent: 3325316 (1967-06-01), MacDonald
patent: 3867155 (1975-02-01), Davis et al.
patent: 4062485 (1977-12-01), Andersen
patent: 4507082 (1985-03-01), Wardlaw, III
patent: 4879452 (1989-11-01), Kovarik et al.
patent: 4881677 (1989-11-01), Amos et al.
patent: 4885452 (1989-12-01), Amos et al.
"Bonding and Joining Technology"Article, Exothermic Brazing Units. 1974. (NASA SP 5925(03) USGPO 1974).

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