Through-hole reflow soldering method
A reflow soldering and reflow soldering technology, applied in the direction of assembling printed circuits with electrical components, can solve the problems of insufficient tin penetration in the hole, thermal damage to plug-in components, and insufficient tin creep, and achieve high soldering quality and reliability. , Improve reliability, simple and convenient operation
Active Publication Date: 2013-02-13
南通卓效自动化有限公司
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Problems solved by technology
[0003] This method has the following disadvantages: 1. During manual repair soldering, it often occurs that the temperature of the soldering iron for manual soldering is high (about 380 ° C), causing thermal damage to plug-in components; 2. The layout of the PCB board may lack space for manual repair soldering; 3. .Plug-in components do not come out of the pins or the pins are not enough, which cannot meet the requirements for the height of tin climbing and may easily cause defects such as cold soldering and virtual soldering; The welding quality of the feet is poor, and the welding strength cannot meet the requirements; 5. Manual repair welding has low efficiency and poor reliability; 6. When manual repair welding cannot be welded, re-selection is often required, which affects the realization of product functions
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[0018] An HDMI plug-in component 1 is provided on the PCB 3 , and the plug-in component 1 is a patch connector with four pins 2 . Among them, the length of pin 2 is 1.8 mm and 2.2 mm, and the thickness of PCB board 3 is 2.0 mm. pin out, and pin 2 with a length of 2.2 mm has a pin out of 0.2 mm, which does not meet the pin out requirements of 0.8 mm to 1.5 mm, such as figure 1 shown.
[0019] When the traditional method is adopted, that is, wave soldering and manual repair soldering, the front side cannot penetrate the tin, and the filling amount of solder in the plug-in hole 4 does not meet the filling requirements of 75% of the plug-in hole 4 of IPC610D (solder joint inspection standard in the electronics industry). The reliability of the components is poor. At the same time, tin is piled up at 4 places in the plug-in hole, and the surrounding large copper skin absorbs heat. The solder joints are likely to cause the risk of cold welding and open welding.
[0020] With the m...
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The invention relates to a through-hole reflow soldering method. The method is characterized by printing solder at the plug-in hole positions where exposed pins can not meet the wave soldering requirement on a PCB (printed circuit board), inserting pins of a corresponding plug-in component into plug-in holes, the pins bringing part of solder paste in the plug-in hole walls and then carrying out reflow soldering. The method has the following advantages: temperature damage to the plug-in component is not easy to cause, the lack of space for manual repair soldering during manual repair solderingis avoided, cold soldering, poor soldering and other soldering defects are not easy to cause, the soldering quality is good, the reliability is high, and the soldering efficiency is high, and the method is suitable for soldering of the plug-in components with the exposed pins failing to meet the wave soldering requirement.
Description
technical field [0001] The invention relates to a welding method for plug-in components, in particular to a method for reflow welding plug-in components in through holes on a PCB when the size of pins of the plug-in components does not match the thickness of the PCB. Background technique [0002] Components are the general term for components and devices. Existing plug-in components are usually soldered by wave soldering. In order to achieve a good wave soldering effect, there are relatively strict requirements on the lead length of plug-in components. The length of the pins refers to the size of the pins of the plug-in components that exceed the reverse surface of the PCB after they are inserted into the PCB, and the length of the pins should be about 0.8 mm to 1.5 mm. When the length of the plug-in components does not meet the requirements, that is, less than 0.8 mm or no pins at all, manual repair welding is often used to weld the plug-in components. [0003] This metho...
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IPC IPC(8): H05K3/34
Inventor 董萌刘海龙赖增茀黄海兵
Owner 南通卓效自动化有限公司