In reflow soldering, the PCB with the placed components goes through a reflow oven.

B：在焊， 带有放置元件的 PCB 通过炉。

That sounds great. And what about the reflow soldering?

A: 听起来不错, 那么焊呢?

After analyzing, we found that the soldering temperature in the reflow oven was not stable.

经过分析，我们发现炉的焊接温度不稳定。

For the reflow oven, we should check the heating elements to make sure they're working evenly.

对于炉， 我们应该检查加热元件以确保它们正常工作。

First, we'll conduct a full - scale calibration of the reflow oven to ensure the temperature control system is accurate.

B：首先，我们将对焊炉进全尺寸校准， 以确保温度控制系统准确无误。

A lot majority of member states have committed in principle to the additional relocation of further 120 thousand people who desire to the international protection has part of this massive migrate reflows.

绝大多数欧盟成员国都同意此次新增的12万难民“分配”计划，在这次难民潮，这些难民都希望得到国际社会的保护。

Question: Why is reflow soldering important in PCBA? Answer: It is important because it attaches surface - mount components to the PCB by melting the solder paste.

3. 问题：为什么焊在 PCBA 要？答案：这要，因为它通过熔化焊膏将表面贴装元件连接到 PCB。

26. Question: Why is it necessary to perform a pre - heating step in reflow soldering? Answer: To evenly heat the components and PCB, prevent thermal shock, and ensure proper melting of the solder paste.

26. 问题：为什么在焊需要执预热步骤？答： 为了均匀加热元件和 PCB，防止热冲击，并确保焊膏正确熔化。

69. Question: How does the temperature gradient during reflow soldering affect the solder joints in PCBA? Answer: A non - uniform temperature gradient can cause stress in the solder joints, leading to cracks or other defects.

69. 问：焊过程的温度梯度如何影响 PCBA 的焊点？答案： 不均匀的温度梯度会在焊点产生应力，从而导致裂纹或其他缺陷。

46. Question: In PCBA, why is it important to control the reflow soldering profile accurately? Answer: An inaccurate profile can lead to issues like insufficient solder joint formation, component damage due to overheating, or uneven soldering.

46. 问题：在 PCBA ，为什么准确控制焊曲线要？答案：不准确的配置文件会导致焊点形成不足、过热导致组件损坏或焊接不均匀等问题。