LEDLead-free solder pasteWhat are its functions and components? NowadaysLEDIn today's society, which is also in a stage of accelerated development, andLEDIn this industry, the demand for it is also quite frequent, usually medium and low-temperature solder paste is used. If you want lead-free and cheap products, use tin and bismuth.4258If it's of good quality, use it Tin, bismuth, silver64351) In the middle Tin, bismuth, silver (containing silver.0.2Or0.4), forLEDFor heavy metal-free solder paste, it is generally composed of two parts: solder powder and flux paste. The different components bring out their own unique characteristics.

Solder paste mainly consists of active agents, epoxy resins, thixotropic agents and organic solvents. Active agentledThe heavy metal-free solder paste can efficiently remove metal oxides from the parts to be welded by electric welding, and can also reasonably reduce the tensile force at the lead-tin interface. Organic solvents can be mixed and adjusted more stronglyledThe uniformity of solder paste without heavy metals. Solder powder is generally composed of tin, bismuth, silver alloy copper, etc. It is formulated in different proportions to achieve a better welding effect. Depending on different melting point requirements, solder can also be classified as hard or soft. According to the customer's requirements and application requirements, solder can also be divided into various styles such as block, rod, small block and flocculent. The distinguished materials and shapes of solder powder also play their own unique roles throughout the entire operation process. After understandingledAfter the efficacy and formation of heavy metal-free solder paste, it is necessary to do a better job in storage. Under normal circumstancesledThe solder paste must be manipulated in1-1At zero degrees Celsius, it can be applied when not opened6For months, it doesn't need to be placed in a well-lit area.

ledFor lead-free solder paste to have a good actual printing effect, it not only depends onledTo control the quality of lead-free solder paste, you also need to pay attention to its efficiencyledLead-free solder paste printing technology.
First of all, it is necessary to do a good job in the early preparatory work for lead-free solder paste printing: 

(1Before printing the solder paste, it is necessary to check whether the steel mesh is deformed and whether there are any vacancies on the squeegee. The steel mesh and the scraper opening should be kept upright, clean, free of dirt and dust to ensure that lead-free solder paste is not easily damaged The actual effect of spot soldering and tin dropping.

(2Try to have it throughout the entire process of solder paste printingPCBSpecial tools for stabilizing the plate, such as tooling fixtures or vacuum pump equipment, should be used to fix the base plate to avoidPCBThe board is misaligned. Raise it The separation of the steel mesh after solder paste printing.
Secondly, during the entire printing process: 

(1Should bePCBThe place where the plate is placed on the steel mesh should be adjusted to the best, and it would be best if there is no gap between the two. Because if the gap is large, it will cause Solder paste leaks onto the solder layer.

(2Lead-free solder paste should be added appropriately at the beginning of printing. It is generally not advisable to add too much or too little at one timeA4The steel mesh is added for the first time400gUp and downA5Steel mesh plus200gUp and downB5Steel mesh plus300gUp and down. 

(3When the solder paste on the steel screen gradually decreases during printing, an appropriate amount of solder paste should be added.
Ultimately,ledIt is better that the separation speed of the steel mesh after lead-free solder paste printing is relatively slow. After continuous printing of solder paste, it is necessary to clean the waste and dirt (adhered solder paste) on the steel mesh to prevent the formation of solder balls during the subsequent printing process. If solder paste is left for too long or stays on the steel screen for too long, its printing properties and viscosity will decline. By adding a mixture of chemicals, improvements can be made.ledThe best workplace for solder paste printing is a clean and sealed production workshop that can also adjust the ambient temperature. Only in this way can the viscosity of the solder paste not be affected by the evaporation of the drug in terms of the actual effect.ledAfter the lead-free solder paste printing work is completed, the steel mesh should be cleaned up neatly to facilitate the next application.

Want to know about solder pasteLead-free solder pasteFor any soldering issues such as solder paste, we welcome partners to consult Shenzhen JJY Industrial Technology Co., LTD. Let's learn and grow together! The solder wire, solder paste and solder rods of JJY brand are always waiting for partners to come and take them together.