What is the difference between laser solder paste and ordinary solder paste

The first thing to determine is that ordinary solder paste cannot replace laser solder paste. The composition and use of ordinary solder paste and laser solder paste are different, and can not be replaced.

Laser solder paste for fpc flexible circuit board

Difference between ordinary solder paste and laser solder paste

Common solder paste is a welding material used in electronics manufacturing and surface mount processes. Its main components are metallic tin and flux, which can be used for hand-coated welding processes. The laser solder paste refers to a solder paste specially used for laser printing, and the main components are nano-sized tin particles and laser sensitive materials.

Ordinary solder paste and laser solder paste have great differences in composition and use. Ordinary solder paste is suitable for hand-coated welding process, while laser solder paste is mainly used in the manufacturing process of laser printing, and the accuracy and stability are higher than ordinary solder paste.

The reason why ordinary solder paste cannot replace laser solder paste

Illustration of the solder paste welding process

Welding process adaptability

Ordinary solder paste: Ordinary solder paste is designed for traditional reflow welding, electric soldering iron and other welding processes, the heating process is relatively slow, the flux can play a role in a long time, remove the surface oxide of the solder, so that the solder is well wetted and welded.

Laser solder paste: Laser welding is a process of rapid heating and cooling, ordinary solder paste under laser irradiation, the flux may not be able to play a timely and effective role, prone to tin explosion, splashing and other problems, can not ensure the quality of welding.

Composition characteristic

Ordinary solder paste: its flux composition focuses on playing a role at a lower heating rate, such as organic acids and other active agents, which may decompose or volatilize prematurely when the laser welding is at a high temperature at an instant, affecting the welding effect. The solder powder size distribution of ordinary solder paste is relatively wide, and the solder particles of different particle sizes are difficult to melt at the same time when the laser is rapidly heated, which is not conducive to the formation of uniform solder joints.

Laser solder paste: contains special additives and ingredients, with higher light absorption, thermal conductivity and thermal stability, can quickly absorb laser energy heating melting. The particle size distribution of the solder powder is narrow and uniform, which ensures that all solder particles melt almost simultaneously under laser irradiation to form high-quality solder joints.

Welding Effects

Common solder paste: When utilized in laser welding, solder joints are susceptible to defects such as tin beads and virtual welding. Additionally, the thickness of the intermetallic compound layer can be uneven, with certain areas being excessively thick. This inconsistency can diminish the fatigue resistance and mechanical strength of the solder joints.

Laser solder paste can create smooth, fully formed solder joints, with minimal occurrence of tin beads and virtual welding phenomena. The intermetallic compound layer that forms between the welded components is thin and uniform, ensuring strong metallurgical bonding and enhancing the reliability and stability of the solder joints.

Application Scenario

Ordinary solder paste is suitable for manual soldering of electronic components and for mass production where the accuracy requirements for welding are not particularly high.

Laser solder paste is ideal for the production of microelectronic devices that require high welding precision and stringent material and environmental standards. This includes applications such as chip packaging for electronic products like mobile phones and computers, as well as the soldering of micro-pitch electronic components.

Suggestions for Selecting Laser Solder Paste

1.Select based on the desired accuracy and stability.

Laser solder paste is characterized by high precision and stability; therefore, the type and specifications of laser solder paste should be selected based on actual requirements.

2.Comprehensive consideration of brand, quality, and price.

When purchasing laser solder paste, it is important to consider the brand, quality, and price comprehensively in order to select a cost-effective option.

Ordinary solder paste cannot substitute for laser solder paste. It is essential to select different types and specifications of laser solder paste based on their specific applications, taking into account factors such as brand, quality, and price.

Songsheng Photoelectric as a domestic laser soldering machine dedicated semiconductor constant temperature monitoring welding head, semiconductor laser, feeding mechanism (wire feeding guide mechanism/dispensing valve), online infrared thermometer earlier developed and applied very successful manufacturers, With camera module, VCM voice coil motor, CCM, FPC, connectors, antennas, sensors, inductors, hard disk heads, speakers, horns, optical communication components, thermal components, photosensitive components and other traditional methods difficult to weld products as research and development objects, we have successfully developed a single-focus laser constant temperature tin welding system. Songsheng photoelectric single focus laser constant temperature tin welding system through the advantages of small laser beam diameter local non-contact heating, it has non-contact, no need to replace the soldering head, small laser beam diameter and other advantages.