What are the key points for solder paste control during the SMT soldering process?

SMTDuring the welding process, whether it is output, time or quality, all need to be controlled within a certain range.Solder pasteIt is a key factor in quality control. So, how can we better manage solder paste? Now, Shenzhen JJY Solder Paste Manufacturer will introduce it to you:

1When storing solder paste, the temperature of the refrigerator needs to be controlled at0to10℃Between them, the solder paste is there5℃The shelf life is about six months, and the thermometer needs to be calibrated every six months;

2The solder paste should be added in and out in sequence according to the serial numbers of the flow. The solder paste should be warmed up for more than four hours before it can be used. If it has been warmed up for more than four hours72If the solder paste has not been used for a while, it must be put back in the refrigerator and stored for a period of time before it can be used;

3In addition, the solder paste should also be stirred with a blender before use1to3It can only be used in minutes. In the reheating area, several bottles of solder paste should be kept on hand at all times. Gloves should be worn before work. Additionally, the boards that have been coated with solder paste need to be reheated for surface mount within four hours.

4Two pieces every hour, and the thickness of the tin should be tested. The standard is generally positive or negative0.3Of course, this is when the thickness of the steel plate is0.05In the case of millimeters.

5Before using solder paste, it is necessary to clarify the type of solder paste to be used, as solder pastes with different ingredients are designed differentlyreflowThe parameters will also be different, such as the melting point183To prepare the solder paste, then the reflux zone time parameter needs to be set to30secto90secOtherwise, it is very easy for cold welding to occur. In addition, the highest temperature also needs to be limited, the peak temperature210℃~240℃;Adjust it according to the actual situation.

6In addition, the control points for different production methods will also vary. For instance, there will be some differences between the two production methods of large quantities with relatively few models and small batches with relatively many models. Therefore, there is no universal so-called control point at present. The most important thing is to consider the specific situation of the enterprise and formulate it based on the actual situation of the enterprise.

The above content is shared with you by Shenzhen JJY Solder Paste ManufacturerSMTAll the key points of solder paste control during the surface mount technology (SMT) processing, hoping to be helpful to you. If you want to know more about solder paste andSMTKnowledge, welcome to leave a message and interact with us!