Electric heating – Metal heating – By arc
Patent
1986-11-24
1987-12-08
Shaw, Clifford C.
Electric heating
Metal heating
By arc
219 75, 21913021, B23K 910
Patent
active
047119861
ABSTRACT:
The penetration in an arc welding process is measured in real time by monitoring the natural frequency of oscillation of the weld pool. Spatial oscillations are induced in the weld pool by modulating either the shielding gas or the welding current at a plurality of different frequencies, and the light reflected from the pool at a non-specular angle is sensed and processed to determine the natural frequency of oscillation. Both pulse and swept frequency modulations are employed for excitation of the weld pool.
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Masubuchi, K., et al., "Improvement of Reliability of Welding by In-Process Sensing and Control", Massachusetts Inst. of Technology, American Society of Metals, pp. 667-695, 1982.
Zacksenhouse et al., "Weld Pool Impedance Identification for Size Measurement and Control", Massachusetts Inst. of Technology, Proceedings of the Winter Annuals Meeting of the American Society of Mechanical Engineers, pp. 77-88, Nov., 1982.
Case, Jr. Allen W.
Lillquist Robert D.
Campbell Donald R.
Davis Jr. James C.
General Electric Company
Shaw Clifford C.
Webb II Paul R.
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