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HOW DOES ULTRASONIC WELDING TEMPERATURE MEASURE?

HOW DOES ULTRASONIC WELDING TEMPERATURE MEASURE?


  Ultrasonic plastic welding is a transient, high temperature, high pressure, local heat process, two plastic parts to be welding in the role of pressure under close contact, the role of ultrasound, the contact surface of the rapid melting of plastic melting; ultrasonic stop, the contact surface melting Plastic in the welding head under the action of pressure, deformation and slowly solidified into a certain connection strength of the joints.

  The welding process of the entire welding time is short, only zero seconds to a few seconds, plus the mechanical operation time does not exceed 10s, the temperature of the welding area in the zero a few seconds from the room temperature rose to the plastic flow above the viscosity of the plastic ; At the same time welding only in the welding contact surface of the local heat, local welding area of the temperature field is a closed environment.

  In this way, the temperature of ultrasonic plastic welding with instantaneous, heating speed, local high temperature characteristics, its measurement is very difficult, and because the welding area after melting will be under a certain pressure extrusion deformation, melting material spread process for the welding temperature The role of field and stress field distribution is enormous, and the molten plastic may decompose at high temperatures to produce oxidizing gases. In this way, ultrasonic plastic welding temperature measurement is more difficult, can not use infrared light non-contact measurement.



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