Integrated optical sensor

Watkins, A D; Smartt, H B; Taylor, P L

Title: Integrated optical sensor

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Abstract

An integrated optical sensor for arc welding having multifunction feedback control is described. The sensor, comprising generally a CCD camera and diode laser, is positioned behind the arc torch for measuring weld pool position and width, standoff distance, and post-weld centerline cooling rate. Computer process information from this sensor is passed to a controlling computer for use in feedback control loops to aid in the control of the welding process. Weld pool position and width are used in a feedback loop, by the weld controller, to track the weld pool relative to the weld joint. Sensor standoff distance is used in a feedback loop to control the contact tip to base metal distance during the welding process. Cooling rate information is used to determine the final metallurgical state of the weld bead and heat affected zone, thereby controlling post-weld mechanical properties. 6 figures.

Inventors:: Watkins, A D; Smartt, H B; Taylor, P L

Issue Date:: 1994-01-04

OSTI Identifier:: 5229239

Patent Number(s):: 5275327

Application Number:: PPN: US 7-960329

Assignee:: EG G Idaho, Inc., Idaho Falls, ID ()

DOE Contract Number:: AC07-76ID01570

Resource Type:: Patent

Resource Relation:: Patent File Date: 13 Oct 1992

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; ARC WELDING; PROCESS CONTROL; COMPUTERIZED CONTROL SYSTEMS; MONITORS; DESIGN; WELDING MACHINES; CHARGE-COUPLED DEVICES; HEAT AFFECTED ZONE; OPTICAL SYSTEMS; SEMICONDUCTOR LASERS; VISIBLE RADIATION; CONTROL; CONTROL SYSTEMS; ELECTROMAGNETIC RADIATION; FABRICATION; JOINING; LASERS; MEASURING INSTRUMENTS; ON-LINE CONTROL SYSTEMS; ON-LINE SYSTEMS; RADIATIONS; SEMICONDUCTOR DEVICES; SOLID STATE LASERS; WELDING; ZONES; 360101* - Metals & Alloys- Preparation & Fabrication

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                    Watkins, A D, Smartt, H B, and Taylor, P L. Integrated optical sensor.  United States: N. p., 1994. 
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                    Watkins, A D, Smartt, H B, & Taylor, P L. Integrated optical sensor.  United States.

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                    Watkins, A D, Smartt, H B, and Taylor, P L. Tue .  
        "Integrated optical sensor".  United States.

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@article{osti_5229239,

  title        = {Integrated optical sensor},

  author       = {Watkins, A D and Smartt, H B and Taylor, P L},

  abstractNote = {An integrated optical sensor for arc welding having multifunction feedback control is described. The sensor, comprising generally a CCD camera and diode laser, is positioned behind the arc torch for measuring weld pool position and width, standoff distance, and post-weld centerline cooling rate. Computer process information from this sensor is passed to a controlling computer for use in feedback control loops to aid in the control of the welding process. Weld pool position and width are used in a feedback loop, by the weld controller, to track the weld pool relative to the weld joint. Sensor standoff distance is used in a feedback loop to control the contact tip to base metal distance during the welding process. Cooling rate information is used to determine the final metallurgical state of the weld bead and heat affected zone, thereby controlling post-weld mechanical properties. 6 figures.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1994},

  month        = {1}

}

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