Lead-free solder pasteManufacturer's5Here is a suggestion: The secret to good solder paste soldering effect. If hardware factories want to achieve better soldering results with solder paste, they must strictly store and use it in accordance with the recommendations of the heavy metal-free solder paste manufacturer. Solder paste belongs to a kind of highly precise soldering raw material. If it is not stored properly, it will be damaged. Damaged solder paste can only be recycled and cannot be used again. Not only do electronic component manufacturers consume a large amount of funds and costs, but this method may also lead to a large number of poor soldering results during the soldering process using heavy metal-free solder paste.

JJY offers some suggestions to everyone:

1The solder paste should be there0~8℃It should be stored in the freezer under ultra-low temperature conditions and must not be exposed to the indoor temperature. The heavy metal-free solder paste that has already been exposed to the indoor temperature should be used up as soon as possible. It is strictly forbidden to have a cycle operation such as warming up and then freezing, and freezing and then warming up again, which may cause great harm to the soldering quality of the solder paste.

2The manufacturer of heavy metal-free solder paste suggests that the solder paste should be taken out of the freezer one day in advance and placed at room temperature for warming operation. The length of the warming time depends on the mixing method used. If the mixing method is done manually, it must be done in advance2~3Take the solder paste out of the freezer in an hour. If the method of mixing is carried out by mechanical equipment, the heavy metal-free solder paste manufacturer believes that it only needs to be taken out of the freezer15In about minutes, the solder paste can be warmed back to the normal temperature according to the solder paste mixer. If the solder paste is not warmed up before being released for printing, a large amount of water vapor may solidify on the surface of the solder paste. During the soldering process, this water vapor may evaporate and cause a "tin explosion" situation, leaving a large number of solder beads on the surface of the circuit board, which may cause the surface of the circuit board to be close2A short circuit fault occurred at one spot welding position. 

3The solder paste should be used up within the period specified by the solder paste manufacturer. If the surface of the solder paste is damp within the storage period, it can be used by stirring it evenly by manual or mechanical means. Before application, electronic component manufacturers must inspect the surface of the solder paste. If it is found that the solder paste without heavy metals has become hard or there is solder mask precipitated on the surface of the paste, it must be processed through a special method before it can be used again; otherwise, many poor soldering problems will occur during the soldering process. The manufacturer of heavy metal-free solder paste suggests that the viscosity of the solder paste can be observed. If it is found that the viscosity is too high and the solder paste cannot pass through the holes of the printed steel wire mesh smoothly, an appropriate amount of paint thinner should be added to the solder paste. After thoroughly mixing the thinner, it can be used again.

4After warming up, take a small amount of the paste from the solder paste bottle according to the mixing. Then, take the outer cap home directly and seal it to avoid it The evaporation of the flux paste inside the heavy metal-free solder paste causes an increase in viscosity. 

5Solder paste manufacturers suggest that employees of electronic component manufacturers should wear rubber gloves and protective masks during the specific printing operation process, on the one hand, to avoid The surface of the circuit board was contaminated by the sweat of the human body. On the other hand, it can prevent the inhalation of too much flux paste component. Although this component cannot be said to have toxic or side effects, excessive contact with the body is definitely not of much benefit.

6When solder paste is printed on the circuit board, it is essential to ensure accuracy. If the printing is inaccurate or the total quantity is too large or too small, the solder paste that has already been printed on the circuit board must be cleaned off. After the cleaned circuit boards are reprinted, the manufacturer of heavy metal-free solder paste suggests that ethanol and other materials should not be used in the process of cleaning the no-clean solder paste.

7After the heavy metal-free solder paste manufacturer proposed to be printed on the circuit board, then4Within an hour, surface mount and flow back soldering must be carried out. Beyond4The soldering quality of solder paste for an hour cannot be guaranteed. 

8Under normal circumstances, no-clean solder paste cannot be purchased and reused. If the solder paste on the stainless steel mesh cannot be reused after many hours, the solder paste inside can be scraped off and stored in a solder paste bottle that has been hollowed out on the same day for proper storage. If the recycled solder paste is to be used, it can be added to the new solder paste by stirring it in small amounts and frequently for application.

9If it is not for the use of no-clean solder paste, the circuit board must be thoroughly cleaned after soldering to remove the residual solder paste after soldering. The cleaning process should be carried out on the same day after soldering to avoid it The residue of solder paste after soldering causes corrosion to the circuit board and electronic components.

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.