Key Points and Applications of Laser Welding in Electronic Components

Soldering components with an electric soldering iron is a basic assembly process, which plays a critical role in ensuring the quality of electronic products. The following are some key points for soldering electronic components.

1. Rosin, rosin oil or non-acidic flux is preferred for soldering. Acidic flux must not be used, as it will corrode the soldered area.
2. Before soldering, scrape the area to be soldered clean with a knife to show metallic luster, apply flux, and then coat with a layer of solder.
3. The electric soldering iron must have sufficient heat during soldering to ensure soldering quality, prevent cold joints and long-term desoldering.
4. The soldering iron should not stay at the soldering joint for too long.
5. After the soldering iron is removed, the component being soldered must not be moved immediately, otherwise the component may easily become desoldered as the solder has not yet solidified.
6. Wires of components to be butted together should preferably be twisted before tinning.
7. When soldering heat-sensitive devices such as transistors, clamp the leads with small flat-nose pliers or tweezers, and control the soldering time.
8. For soldering semiconductor components, thinner low-temperature solder wire is preferred, with a short soldering time.

As electronic components are continuously becoming miniaturized, smaller solder joints, higher soldering strength and a smaller heat-affected zone around the processing area are required. Traditional soldering technologies suffer from poor appearance of welds, low efficiency, weak bonding between the weld loop and the soldering area, and frequent problems such as “desoldering”, making them difficult to meet modern requirements.

Laser welding, by contrast, achieves true fusion welding, allowing materials at the contact points to melt and mix. Laser soldering machines use laser radiation on the pad surfaces where electronic components are connected to the circuit board. The laser energy heats the solder, which melts instantly to form smooth, full and reliable solder joints.