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Ultrasonic Welding 超聲波焊接

Ultrasonic Welding 超聲波焊接

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超聲波焊接是利用超聲波或振動產生焊接熱的焊接工藝。超聲波是指頻率高于正常聽力范圍的振動波。它大約是20000到30000赫茲。這是一個固態焊接過程。固態焊接是一種不需要外加熱量進行焊接的焊接工藝。Ultrasonic welding is a welding process in which ultrasonic waves or vibrations are used to generate heat for welding. Ultrasonic means those vibration waves which have frequency above the normal hearing range. It is about 20000 to 30000 Hz. It is a solid state welding process. Solid state welding is a welding process in which no external heat is added for welding.

換能器是將高頻電信號轉換為高頻機械振動的裝置。這是連接到焊接頭。焊接過程中使用的轉換器或壓電換能器。Transducer is a device which can convert high frequency electric signal into high frequency mechanical vibration. This is connected with the welding head. The converter or piezoelectric transducer used in this welding process.

它的工作原理是超聲波能量的基本原理。超聲波振動在兩個工件的觸點之間產生動態剪切應力。由于局部塑性變形和由于接觸表面之間的摩擦而產生的熱量,將在界面處形成接頭。It works on the basic principle of energy of ultrasonic wave. Ultrasonic vibration creates a dynamic shear stress between the contacts of two work piece. Due to local plastic deformation and heat generate due to friction between contact surfaces, joint formation will take place at the interface.

 

  • At the start, high frequency current passes through a piezoelectric transducer. This transducer converts high frequency electrical signal into mechanical vibration. 
    在開始時,高頻電流通過壓電傳感器。該傳感器將高頻電信號轉換為機械振動。
  • This vibration further supplied to the booster which amplify its frequency. 
    這種振動進一步提供給助推器,以擴大其頻率。
  • The amplified high frequency vibration passes through horn which is in contact with welding plate. 
    放大的高頻振動通過與焊接板接觸的喇叭。
  • This welding creates lap joint. One plant of the weld is fixed into fixture and other one is in direct contact with horn. These plates are fixed under moderate pressure force. 
    這種焊接產生搭接。焊接的一個裝置固定在夾具上,另一個裝置與焊角直接接觸。這些板是在中等壓力下固定的
  • The horn supply high frequency mechanical vibration to the welding plate. 
    喇叭為焊接板提供高頻機械振動
  • Due to this vibration, oscillation shear force act at the interface between welding plates which result elestoplastic deformation at interface. 
    由于這種振動,焊接板之間的界面受剪切力的振蕩作用,導致界面處產生塑性變形。
  • It also create a localize temperature rise due to mechanical force and friction. This heat helps in plastic deformation at interface and makes a strong joint without melting of work piece or using filler metal. 
    由于機械力和摩擦力,它還會造成局部溫升。這種熱量有助于界面的塑性變形,使堅固的接頭不熔化工件或使用填充金屬。
  • Applications 應用

    • This welding is used in fabrication of nuclear reactor components. 
      這種焊接用于制造核反應堆部件
    • It is used in automotive industry for key, head lamp parts, button and switches etc. 
      適用于汽車鑰匙、頭燈零件、按鈕、開關等
    • Ultrasonic is used in electronic industries like armature winding, switches etc. 
      超聲波廣泛應用于電樞繞組、開關等電子行業。
    • This is clean welding process so it is used in medical industries to make parts like filters, masks etc. 
      這是一種清潔的焊接工藝,用于醫療行業制造過濾器、口罩等零件。

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