Greetings,
It's my understanding that ultrasonic welding is a high-risk assembly technique due to the welding frequencies being near the mechanical resonant frequencies of the sensors (most notably the gyro). I would like to understand risk-mitigation options in the event that ultrasonic welding is the only choice.
Similarly to this post, we have two plastic casings that firmly house our PCB and are considering ultrasonic welding. We are using the MPU-9250 and have found that the mechanical frequency of the gyro ranges between 25 - 29 kHz.
We plan to do the following to reduce the risk of sensor damage:
- Add a silicone layer at the plastic-PCB contact points to reduce the ultrasonic effects
- Choose welding frequency well outside the 25 - 29 kHz range
Does anyone have experience in this or have recommendations/suggestions if ultrasonic welding is the required assembly method?
Thanks,
John