Lead-free Solders And Their Properties

Lead-free solder - in simple terms, this is a category of materials that do not contain lead in their chemical composition. Initially, the materials in this category were created for environmental reasons. This is due to the structure of lead, the fact is that this metal is very heavy; it negatively affects the environment and can harm the health of the human body.

Lead-free materials, but other harmful substances, such as mercury and cadmium, are also classified as lead-free.

We Aim to Provide Best Lead Free Solder Wire Materials

Replacing traditional types of solders with lead-free materials is not only a trend of the times, but also a requirement of numerous international environmental commissions. The article discusses the properties of various types of lead-free solders, gives recommendations for their use.

As manufacturers continue to comply with the ROHS directive, the use of lead-free solder wires in electronic products has become more and more common. The soldering practices of ROHS and non-ROHS solders have the difference between lead-free solder wire ROHS and non-ROHS soldering.

Welding temperature

The lead-free solder wire melts at a higher temperature of about 217°C / 422°F, while the lead-based option is 183°C / 361°F. Therefore, PCB materials and electronic components must be able to withstand higher temperatures.

Due to the high soldering temperature, the soldering iron must be removed more quickly to avoid icicles, damaging components or tracks.

Poor wettability

The wetting of the lead-free solder wire ROHS takes longer and is worse on dirty oxidized surfaces; in addition, this solder will not spread like the lead-based option. Increasing the temperature can improve the wettability; however, high temperature will shorten the life of the soldering iron tip and may damage the PCB and components.

More aggressive fluxes can also be used to improve wettability. In this case, a thorough post-weld cleaning should be performed to prevent flux-related problems such as corrosion, dendritic growth, poor adhesion of consistent coatings, and electromigration, which may because circuit traces The short circuit.

Lead-free soldering technologies: SAC solders and electrically conductive adhesives

When working with low-temperature soldering processes , control over the technology of manufacturing joints is better, while the brazed elements are not sensitive to the slightest temperature deviations. Low temperatures also mean less stress on equipment and materials (printed circuit boards and components) that are heated during assembly, and higher productivity in electronics manufacturing due to shorter heating and cooling times.

Characteristics of lead-free solder wire

1. Good wettability, electrical conductivity, thermal conductivity, easy to tin.
2. The rosin content% is customized according to the customer's requirements, and the welding does not splash.
3. The flux is evenly distributed, and there is no broken flux in the tin core.
4. The winding is even without knots, the tinning speed is fast, and the residue is minimal.
5. The diameter of the tin wire can be customized from 0.6 to 3.0 mm

Solder for SMD is an alloy of metals of a certain composition, designed to create high-quality solder joints of pin elements with the contact pads of a printed circuit board. Various types of this consumable are used in the electronics industry for soldering terminal components, repairing and modifying modules.

Lead-free solder bar is used in a variety of soldering processes, including lead-free automatic wave soldering. Despite the higher cost than tin and copper based solder, this solder is popular for welding various electronic parts due to its temperature resistance and fusibility.

High purity soft solders

Our soft solders provide quality soldering. We offer a range of lead-free and lead-free solders as standard (melting point 115 ° C - 450 ° C).

We produce preforms according to your wishes

If you need complex shaped stamped parts, balls, wires and strips made of hard, soft solder, alloys of a certain composition, if you have special wishes - We will arrange production with maximum flexibility to fulfill your individual orders. In our production, we use only high-purity raw materials and deliver our products quickly, simply and reliably.