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WorkingBear has noticed that many engineers or managers involved in Surface Mount Technology (SMT) have a strong passion for “PCB baking,” but their understanding of the concept might not be very clear. If you browse through discussions on PCB and SMT related forums, you’ll often find people treating “PCB baking” as a magical solution to struggle the soldering and quality issues. They believe that pre-baking PCBs before SMT can improve solderability, wetting performance, and the height of solder fillet. But is that really the case?
https://mpe.researchmfg.com/pcb-baking/5W1H (5Ws and How)基本上也可以算是問題分析與對策(Problem solving and solution)的一種手法，但它更像是用來思考與描述問題的方法，它可以幫助我們更全面性的思考與描述問題，探討可能原因並採取解決方案，涵蓋性雖然粗糙了點，但瑕不掩瑜，它仍然是個易記好懂的手法。5W1H也經常被稱為六何法(Six Ws)，另外也有人會擴充多加一個H成為5W2H，稱為七何法。
https://www.researchmfg.com/2023/07/5w1h-6ws/工作熊平常還蠻常逛一些網路論壇看人家討論工程問題，但經常會看到一些無厘頭的問題。比如放了一張SMT的回焊爐測溫曲線圖，然後什麼背景資料都沒說，就希望大神可以指點迷津，教自己該如何調整回焊爐曲線以改善焊錫品質。比較好的可能還會描述一下自己遇到的狀況，比如PCBA生產了20,000套大約有30個BGA假焊不良(1.6mm板厚0.65mm間距的BGA)，請問大神該如何調整爐溫來降低BGA假焊的不良率。
https://www.researchmfg.com/2023/06/how-to-ask/When developing a new product, it is common to conduct a “trial run” to obtain a prototype sample. This serves two purposes: firstly, it allows developers to further test and validate the prototype’s functionality, and secondly, it helps the manufacturing factory understand the production process and prepare for mass production. Feedback and suggestions based on the prototype’s test results are provided by various departments involved.
https://mpe.researchmfg.com/evt-dvt-pvt/Why don’t the electronic components on the first side of the double-sided PCB fall off due to re-melting of the solder during the second time reflow process in the SMT oven? How much does the melting temperature of the lead-free SAC305 solder alloy increase during the second time reflow process? Perhaps it’s because the components on the first side are more well-behaved and don’t cause trouble! This is just a joke, of course.
https://mpe.researchmfg.com/sac305-2nd-reflow-temperature/
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