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The difference between lead-free reflow soldering and leaded reflow soldering

2025-10-30 01:22:21

Lead-free reflow soldering uses lead-free, environmentally friendly solder paste, and the products are all lead-free and environmentally friendly. Lead-free reflow soldering is still somewhat different from regular leaded reflow soldering. Here, Jeenoce Electronics (JEENOCE) will share the main differences between them.

1. Different soldering temperatures: Lead-free reflow soldering has a higher soldering temperature, while leaded reflow soldering has a lower soldering temperature.

2. Different environmental impact: Lead-free reflow soldering is environmentally friendly and prohibits leaded products; it must be lead-free and eco-friendly.

3. Different high-temperature resistance: Lead-free reflow soldering has better high-temperature resistance than leaded reflow soldering.

4. Leaded solder alloys have a lower melting point and lower soldering temperature, causing less thermal damage to electronic products; leaded solder alloys have a smaller wetting angle and better solderability, making the likelihood of 'cold solder joints' smaller; the solder alloy is tough, and the resulting solder joints have better shock resistance than lead-free solder joints.

Lead-free reflow soldering machines are a type of reflow soldering. Early reflow solders all used lead-containing materials. With increasing awareness of environmental protection, people are paying more attention to lead-free technology (i.e., today's lead-free reflow soldering). The biggest changes are in materials, especially solder alloys. In terms of process, the biggest influence comes from soldering techniques, which are mainly caused by the properties of solder alloys and the differences in corresponding fluxes.


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