Soldering Reflow Profile Zones. Lead & Lead-Free Solder Paste!

Reliable soldering PCB reflow profile for LEAD Solder Paste and LEAD-FREE Solder Paste. Set up Reflow Oven, Temperature, Zones and Time.
Learn how to set the correct temperature in each zone of your reflow oven for both leaded and lead-free soldering pastes. This guide explains thermal stabilization, flux activation, and cooling timing.

In this video, I walk you through the full reflow process used in electronics manufacturing. You’ll learn:
📝The purpose of each reflow oven zone (preheat, soak, reflow, cooling).
📝How flux works and why ROL0, ROM0, and ROH0 matter.
📝When and why cold joints happen.
📝The difference between eutectic and mushy-zone solder paste behavior.
📝Why smooth cooling is critical for lead-free soldering paste alloys.
📝Zone timing and temperature recommendations.
📝Check the soldering profile after adjustment using a thermal profiler.

📌 Additional Video: How to Clean Flux Residue After Soldering
   • Cleaning PCBs After Soldering – No More Fl...  

💪 Soldering Fluxes "Diamond Flux" — https://express-24.io

💪 Electronics consultation — https://express-24.io/consulting.html

💪 Instagram —   / diamond.flux.soldering  


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⏱ Timecodes:
00:00 — Why Reliable Reflow Profiles Matter
00:25 — How to build a correct reflow profile?
00:48 — Zones 1 & 2: Preheating Explained
01:12 — Zone 3: Thermal Stabilization
01:30 — Soldering Flux Activation and Remove Oxides
02:51 — Lead and Lead-Free Soldering Pastes Melting Points. Mushy Zone
03:30 — Zone 4: Reflow. Cold Joint Risks from Lead-Free Solder Paste
04:13 — Zone 5: Cooling and the Mushy Zone 217°C
05:05 — Comparing between OLD 4 zones and New 12 zones reflow ovens.
05:24 — Timing Recap for All Zones
06:04 — Thermal Profiler Reminder & Outro