Control of spot weld quality by infrared thermal sensing

Details Control of spot weld quality by infrared thermal sensing Control of spot weld quality by infrared thermal sensing

1978-07-19

1980-07-22

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

73342, 250358R, G01J 100

Patent

active

042141648

ABSTRACT:
Control of spot weld quality is effected by observing the progress of heat generation within the weld and initiating automatic corrective action if the heating rate is initially too high or too low. A flexible optical fiber bundle has one end located in the welding tip and the other end optically coupled to an infrared detector. Due to the excellent thermal conductivity of the copper material of the welding tip, thermal energy is conducted very rapidly for a short distance into the tip during the weld formation so that the infrared detector produces an output signal proportional to the weld temperature. This signal is sampled and compared with a previously-recorded signal corresponding to the heating rate that produced a good spot weld in the material being welded.

REFERENCES:
patent: 3191441 (1965-06-01), Erickson
patent: 3868508 (1975-02-01), Lloyd

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