PCB News - What is the mechanical stress in PCBA assembly?

What is the mechanical stress in PCBA assembly?
Mechanical stress is caused by external reasons. When the body is deformed (force, load, temperature change, etc.), the interaction between the body parts of the internal force is generated in order to resist the influence of this external cause, and try to restore the body from the deformed position to the before deformed position. s position.

The mechanical stress in the assembly manufacturing process mainly includes the following aspects:

1. The pressure applied to PCBA when operating molds and equipment.

For example, when the PCBA is taken out of a tight fixture, the chip capacitor will break. Improper adjustment of the support on the second side of the double-sided printing caused cracks or damage to the top mounted components; the manual board appeared to be damaged or the components were damaged.

2. The force exerted by the rapidly changing temperature difference on the PCBA during the soldering process.

In the process of PCBA reflow soldering, wave soldering and manual soldering, the temperature difference is too large, which may cause the PCB to warp. The solidification of the solder will generate mechanical stress on the components of the PCB, causing stress cracks in the ceramic and glass parts of the component. Stress cracking is an unfavorable factor that affects the long-term reliability of solder joints.

3. The tolerance of mechanical shock caused by collision and drop caused by improper use of PCBA.

Solder joints are generally not damaged by mechanical shock. However, the welding structure of other parts will fail. For example, the large inertia force generated by large and heavy lead components when subjected to mechanical impact will cause the copper covering on the PCB to peel off or the board to break, thereby damaging the component itself.
We are not an agent

Our factory is located in China. For decades, Shenzhen has been known as the world's electronics R&D and manufacturing center. Our factory and website are approved by the Chinese government, so you can skip the middlemen and buy products on our website with confidence. Because we are a direct factory, this is the reason why 100% of our old customers continue to purchase on iPCB.

No minimum requirements

You can order as little as 1 PCB from us. We will not force you to buy things you really don't need to save money.

Free DFM

Before you pay in the most timely manner, all your orders will receive free engineering document review services by our well-trained professional and technical personnel.

On-time delivery

Over the years, we are proud to maintain a 99% on-time delivery rate. We work in three shifts to ensure that your PCB can appear on your desk as planned and as early as possible. You can choose DHL and other courier services to balance speed and budget. We only use services from reliable and reputable companies.

24 hours customer service

Whenever you encounter any problems, you can contact the on-site customer service staff to reply to your emails or messages. From the moment you submit the Gerber file to the moment you receive the PCB and assembled PCB, our service staff will follow up your order with satisfaction.

Customer complaints and refunds

iPCB attaches great importance to customer satisfaction, so we have established a responsible customer complaint department. If you are dissatisfied with our products after receiving our products, you can ask us to refund to your iPCB credit account, or request to re-produce the failed order. Of course, if you are still dissatisfied with our service or have any suggestions, you can send an email to us so that we can spend more time improving our services and establishing a complete suggestion system to satisfy our customers and ensure their interests.