Projektowanie PCB

Jakie są czarne plamy na złączach lutowanych bezołowiowych na płytce drukowanej??

Those dark splotches may be leftovers from the resin-based flux. No-clean fluxes are often made out of water-soluble resins (vs rosin) and during heating, most of it will evaporate away.

Pay attention to soldering temperatures. Sn96.5/Ag3.0/Cu0.5 solder’s liquidus is 217 °C. Soldering at high temperatures you have been using can potentially damage components, has been weakening the glue under every pad you solder (the copper is glued to the FR4), producing significantly more hazardous fumes, something that is already more hazardous with lead-free solders, and generally does nothing good.

As far as I know, it should not have a meaningful impact on the joint, but if you want to avoid this, I suggest lowering your iron temperature (and possibly getting a new tip and/or iron depending, so soldering is effective at said lower temperature), though this may not totally resolve the issue.

Czytaj więcej: Prototyp PCB

#PCB Assembly #PCB Design

AddThis Website Tools
Olivera Smitha

Oliver jest doświadczonym inżynierem elektronikiem specjalizującym się w projektowaniu płytek PCB, obwody analogowe, systemy wbudowane, i prototypowanie. Jego głęboka wiedza obejmuje ujęcie schematyczne, kodowanie oprogramowania sprzętowego, symulacja, układ, testowanie, i rozwiązywanie problemów. Oliver specjalizuje się w przeprowadzaniu projektów od koncepcji do masowej produkcji, wykorzystując swoje talenty w zakresie projektowania elektrycznego i zdolności mechaniczne.

Najnowsze posty

Impedance Matching: A Critical Factor in High-Speed PCB DesignDopasowania impedancji: A Critical Factor in High-Speed PCB Design

Dopasowania impedancji: A Critical Factor in High-Speed PCB Design

Impedance matching has become a cornerstone of the signal integrity in the realm of high speed PCB

3 weeks ago
How to Clean a Circuit Board Safely and Effectively?How to Clean a Circuit Board Safely and Effectively?

How to Clean a Circuit Board Safely and Effectively?

It is important to learn how to clean a circuit board properly if you’re working

1 month ago
Counterbore vs Countersink: Which to Choose for Your PCB?Counterbore vs Countersink: Which to Choose for Your PCB?

Counterbore vs Countersink: Which to Choose for Your PCB?

When designing PCBs, selecting the appropriate type of holes for fasteners is crucial. And much

1 month ago
PCB Copper Foil: Types, Properties & How to ChoosePCB Copper Foil: Typy, Nieruchomości & Jak wybrać

PCB Copper Foil: Typy, Nieruchomości & Jak wybrać

PCB copper foil is one of the most critical materials in the printed circuit board

1 month ago
MOKO Technology Launches Vietnam Manufacturing Base in February 2025MOKO Technology Launches Vietnam Manufacturing Base in February 2025

MOKO Technology Launches Vietnam Manufacturing Base in February 2025

Shenzhen, Chiny - Luty 11, 2025 - Technologia MOKO, a leading global electronics manufacturing service

2 months ago
PCB Solder Mask: What It Is and Why Every Circuit Board Needs It?PCB Solder Mask: What It Is and Why Every Circuit Board Needs It?

PCB Solder Mask: What It Is and Why Every Circuit Board Needs It?

While most people focus on the components and copper traces that make up PCBs, there's

3 months ago