How to Solve the Problem of Tuning Fork Crystal Damage Cause by Ultrasonic Welding ?

When it comes to ultrasonic welding and its potential impact on tuning fork crystal oscillators, there are a few key factors to consider in order to prevent damage to the crystal. Here are some tips for avoiding oscillator damage during ultrasonic welding:

Follow proper ultrasonic operation procedures:

• Confirm the performance of the ultrasonic machine, including the design of the ultrasonic welding head and the parameters used during operation.

• Avoid working overtime.

• Reduce the ultrasonic frequency to an appropriate level.

Design the product shell and crystal placement carefully:

• Ensure that the product shell design is impartial.

• Keep the crystal position as far away from the edge of the board as possible.

It's important to note that ultrasonic waves can potentially cause defects in crystal oscillators, which is why it's crucial to follow proper procedures and be mindful of the oscillator's placement during ultrasonic welding.

Ultrasonic welding works by using high-frequency vibration waves to transmit to the surfaces of two objects being welded. Under pressure, the surfaces of the objects are rubbed together, forming a fusion between the molecular layers. The conversion of 50/60Hz current into 15, 20, 30, or 40 kHz electrical energy by means of an ultrasonic generator can lead to issues with tuning fork quartz crystals due to their frequency being 32.768kHz, which can be close to 40kHz and cause resonance, resulting in the crystal being broken.

Ultrasonic plastic welding works in a similar way, generating high-frequency vibration on the contact surface of two thermoplastic plastics. This vibration creates frictional heat, melting the contact surface and allowing the two plastics to join together seamlessly.

The advantages of ultrasonic plastic welding include fast welding speed, high welding strength, and good sealing. It's a low-cost, clean, and pollution-free process that doesn't damage the workpiece. The quality of the welding depends on the amplitude of the transducer welding head, the applied pressure, and the welding time. These factors can be adjusted to achieve the optimum pressure, which is the product of the edge length of the welded part and the optimum pressure per 1mm of the edge.

By following the proper procedures for ultrasonic welding and being mindful of the placement of tuning fork crystal oscillators, it's possible to prevent damage and ensure the reliability and functionality of electronic products.

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