source:Industry News release time:2022-09-20 Article author:yu Popular:pcb
1. The quality and efficiency of welding work are too low
(1) Due to the application of high-quality intelligent soldering irons such as ERSA, OK, HAKKO, Crack, etc., the quality of soldering PCBA has been improved, but there are still some factors that are difficult to control; control, the consistency of soldering PCBA, the penetration rate of metallized holes requirements, etc. Especially when the component leads are gold-plated, for the parts that need to be soldered with tin, it is necessary to remove the gold and tin glaze and the lead before soldering, which is a more complicated thing in the process.
(2) Manual welding also has shortcomings such as human factors, and it is difficult for this manual welding method to meet the requirements of standard high quality. For example: with the increase of the density of the pcba circuit board and the increase of the thickness of the pcba circuit board, the heat capacity of the solder also increases in turn, and the soldering iron welding easily leads to insufficient heat, resulting in the virtual welding of the pcba pad or the climb of the through-hole solder that does not meet the requirements high. .If the soldering temperature is too high or the soldering time is prolonged, it is easy to damage the pcb printed circuit board, causing the pads to fall off.
(3) Traditional manual soldering iron soldering requires many people to use point-to-point soldering for PCBA; selective wave soldering is to apply flux first, then preheat the PCB circuit board/chemical flux, and then use the solder tip for soldering mode. The production line industrialized mass production mode is adopted. Different sizes of tips can be welded by drag welding in batches. Generally, the soldering method of smt technology wave soldering is dozens of times more efficient than manual soldering.
2. High quality of wave soldering of smt process equipment
(1) When using wave soldering, the welding parameters of each solder joint can be "tailor-made", and there is enough process adjustment space to adjust the welding conditions of each solder joint, such as flux spray amount, welding time , Soldering adjusts the wave height and wave height to the best, which can greatly reduce the defect rate, and even realize zero-defect welding of through-hole components. Selective wave soldering (DPM) has the lowest defect rate compared to hand soldering, through-hole reflow soldering and traditional wave soldering.
(2) The wave soldering of the smt process equipment uses a programmable movable small tin cylinder and various flexible and diverse soldering tips, so some fixing screws and fixing screws on the PCBB surface can be avoided by programming during PCBA soldering. Reinforcing ribs and other parts to avoid damage caused by contact with high-temperature solder, and no need to use custom pads.
(3) Under normal circumstances, from the comparison of wave soldering and smt manual soldering in the smt process workshop equipment processed by pcb board manufacturers, it can be fully understood that automatic wave soldering has good quality, high efficiency, good flexibility and many defects. Numerous benefits of low losses, less contamination and a wide variety of soldered components.
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