The causes and solutions of false soldering in SMT solder paste use

The phenomenon of false welding issmtIt is relatively easy to occur during use, which makes many users very distressed. Today, Shenzhen JJY Solder Paste Manufacturer will introduce to you the causes of false soldering and what countermeasures should be taken after it occurs:

1The solder paste was opened before use, resulting in poor sealing and the evaporation of solvents such as rosin. Solution: When purchasing solder paste, make sure to check its shelf life. When not in production, do not open the solder paste casually when it is stored in the refrigerator. If you need to use solder paste that is opened on the same day, try to use it up on the same day.

2Misprinting using solder pastePCBThe sheet was not cleaned thoroughly, resulting in the relevant tin powder remaining on it. This situation is relatively easy to handle. Generally, professional brushes and cleaning agents are usedPCBJust clean the board thoroughly.

3PrintedPCBThe sheet was left for too long, causing the solder paste to dry out. This situation occurs atSMTWhen the solder paste has been printed during the surface mount process and it is time to go through reflow soldering, the printed solder paste should be placed before entering the reflow soldering ovenPCBThe placement time of the board should be well controlled as much as possible. It should not be too long. If it is placed for too long, the soldering flux components in the solder paste will evaporate, which may also lead to defects after passing through the furnace.

4This is caused by excessive synthetic solvents added during the production process of solder paste. Before purchasing solder paste for mass production, samples of the solder paste should be tested to prevent such situations from occurring.

5When the solder paste was reflow, the power supply tripped and cut off, resulting inPCBThe solder paste on the board has stayed in the reflow oven for too long. When such a situation occurs, it is necessary to regularly check the power supply and the machinery and equipment.

6False soldering may occur when the temperature curve is improperly set during the solder paste reflow setting or the chain speed is inappropriate. It is recommended to reset the reflow soldering temperature parameters and the furnace temperature test, and seek assistance from the supplier for handling.

Shenzhen JJY Industrial Technology Co., Ltd. mainly engages in:QFNHigh solder climbing rate solder paste, zero halogen solder pasteVOIDLow-porosity solder paste, laser solder paste, water-washed solder paste, and high-reliability ones used in military, aerospace, power, photovoltaic and other industriesSn62Pb36Ag2Solder pasteSn62.8Pb36.8Ag0.4Solder paste6337Solder paste, transparent and colorlessLEDHigh-brightness anti-monument solder pastemini-LED/micro-LEDDie bonding solder paste, high-reliability lead-free low-temperature solder paste, low-temperature solder paste for heat sinks, professional solder paste for hardware soldering, lead-free medium-temperature solder paste, lead-free high-temperature solder paste0307/105/305Manufacturers of solder paste and other soldering materials.