Why is lead not allowed on printed boards, assembly processes and products? There are two reasons for this: first, lead is toxic and affects the environment; Second, leaded solder is not suitable for new assembly technology.
In order to meet customer requirements, the circuit board must plug holes through the hole, after a lot of practice, change the traditional aluminum sheet plug process, with white mesh to complete the circuit board surface welding and plug holes.
General circuit board production will be carried out board work, its purpose is to increase the production efficiency of SMT production line.
According to the activity of flux, it can be divided into active (RA), medium active (RMA), inactive (R), water washing (OA), no cleaning (NC)
SMT technology has only a history of more than 40 years. It has gone through the journey from birth, perfection to maturity with extraordinary speed, and entered the flourishing period of large-scale industrial application.
In the SMT process, there are six mounting quality problems that need attention: 1, mount design quality, 2, mount raw materials (components, PCB, welding paste and other mount materials) quality, 3, mount process quality (process quality), 4, mount weldi
In the process of electronic machining, the smaller the Angle of the scraper affects the vertical force of the solder paste, the greater the vertical component of the force.
Here are several circuit board surface treatment is currently more common process, I can only say that there is no the most perfect surface treatment, so there are so many choices, each of the surface treatment has its own advantages and disadvantages, th
Image of local separation caused by local expansion between layers of substrate or between substrate and conductive foil or between substrate and protective coating.
ISO9001 certification, CCC certification is the basic certification of PCBA manufacturers, can obtain ISO13485, IATF16949, UL certification of PCBA manufacturers are more comprehensive strength of the enterprise.
With sufficient theoretical basis, more practice, more learning, more summary, in order to be qualified for the PCBA circuit board maintenance post.
Under proper working conditions, most electronic devices can have a life expectancy of decades or more, but some still fail prematurely. The reason is often the stress of not being noticed.
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