Electric heating – Metal heating – For bonding with pressure
Patent
1980-04-07
1982-05-11
Truhe, J. V.
Electric heating
Metal heating
For bonding with pressure
219108, B23K 1104, B23K 1124
Patent
active
043295606
ABSTRACT:
In a method for flash welding metallic materials comprising a flashing step of applying a commercial alternating voltage or a direct-current voltage resulting from its full-wave rectification to the abutting ends of metal workpieces contacted partly with each other to generate Joule heat at their abutting ends and the vicinity thereof and then to generate sparks between the ends and repeating the procedure, and an upsetting step of press-bonding the ends and supplying an electric current to the metallic workpieces during this time; the improvement wherein the alternating voltage or direct-current voltage is used as a fundamental wave voltage and another voltage is superimposed thereon to modulate the wave form of the fundamental wave to obtain a distorted wave voltage, the distorted wave voltage being such that in each 360.degree. cycle, the Joule heat generating period begins at a phase angle between -45.degree. and 0.degree. and terminates at a phase angle between 45.degree. and 135.degree. in the first half cycle and begins at a phase angle between 225.degree. and 315.degree. in the second half cycle.
REFERENCES:
patent: 2727969 (1955-12-01), Platte
patent: 3119927 (1964-01-01), Neukom et al.
patent: 3484578 (1969-12-01), Sciaky
patent: 4052585 (1977-10-01), Sidyakin et al.
patent: 4273984 (1981-06-01), Hara et al.
George Keith E.
National Research Institute for Metals
Truhe J. V.
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