Abstract
The development of a point infrared sensor was undertaken in an effort to reduce the size and cost of an infrared sensing system for welding process monitoring and control. Numerical modeling, sensor development and welding process control were integral phases in the course of this effort. A numerical model of the heat transfer during autogenous arc welding was used to estimate the net heat exchange between a weldment surface and a point infrared detector as a function of sensor position about the welding arc. The gas tungsten arc welding process was monitored with a point infrared sensor. Feedback control of the infrared exchange between the weldment and the point infrared sensor was accomplished by adjusting the welding current. Welding process control was demonstrated on both constant thickness plates and plates with a step change in thickness.
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