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JST Optical / Laser Seam Tracker0 pages
Model JST Optical Seam Tracker
nnNon-Contact OperationLaser Sensor
High Precision
All Types of Weld Joints Complete Range of Slides Multi-Pass Capability
nnIntroduction
Conventional seam tracking systems with tactile probes have been used for many years and have a proven record of success. There are, however, a number of applications where the use of a probe which must "feel" the weld joint can lead to irregular and unreliable results. In these applications, it has been traditional to resort to special probe designs and to have the operator monitor the weld process in order to take corrective action if the seam tracker probe is seen to leave the joint.The introduction of laser tracking permits automatic joint tracking to be used in the more diffi cult joint confi gurations. As the system functions with no contact between the sensor and the joint, there is no tendency for the system to run out of the joint. The system is suitable for all types of joint design and all arc welding purposes. >
nnSystem Elements
nnLaser SensorThe compact laser sensor is normally mounted on or near the welding torch. It is of a robust design and construction to function satisfactorily, even in high current and heat environments. Units have been used in applications with welding currents up to 700 amps.The sensor houses laser diodes with optics which project a fan of visible laser light on to the work piece. A CCD camera in the sensor, set at a tri-
angulation angle to the laser diodes, receives a refl ection from the surface of the part which is a contour map of the joint geometry. Using triangula-
tion permits not only the horizontal features to be detected, but also the height (sensor to work piece distance) to be determined.The sensor is supplied complete with a spatter shield with disposable protective window. This protects the laser diodes and the camera from the heat and fumes of the welding arc. Dry compressed air can be fed to the sensor to assist in cooling and to keep the protective window free of fume buildup. For high heat applications, a water cooled sensor mount is included to integrate with an optional or customer supplied water chiller. >
Description
The complete seam tracking system consists of the following elements:
Laser Sensor
Seam Tracker Control
Pendant Control
Motorized Cross-SlideAll the elements of the system have been devel-oped to be compatible. There is no need for you to mix and match components from different manu-
facturers with all the problems that entails. >
