How to Check the Quality of PCBA Manual Welding

     Welding is to reliably connect all kinds of components that make up the complete machine product, and its quality is closely related to the quality of the complete machine product. The quality of each solder joint affects the stability, reliability and electrical performance of the entire machine. Do you know how to check the welding quality of PCBA manual welding?

 

1. Quality Requirement for Manual Welding

1) Electrical contact should be good: Good solder joints should have reliable electrical connection performance, and phenomena such as false soldering and bridging are not allowed.

 


2) Mechanical strength must be reliable: It is necessary to ensure that the solder joints will not fall off due to normal vibration during use.

 

 

3) Should maintain a beautiful appearance: The surface of a good solder joint should be smooth, bright, and free from sharp edges, wrinkles, bubbles, slag inclusions, and pitting. The transition from the solder to the metal to be welded should present a sleek and smooth wetted concave surface.

 

 

2. Quality Inspection Method of Manual Welding

1) Visual Inspection

Visual inspection refers to visually checking whether the welding quality is qualified and whether the solder joints are defective. The main contents of visual inspection are:

① Whether there is any solder skip;

② Whether the gloss of the solder joints is good and whether the solder is enough;

③ Whether there is bridging or peaking;

④ Whether there are cracks in the solder joints;

⑤ Whether the solder pads are warped or peeled off;

⑥ Whether there is residual flux around the solder joints;

⑦ Whether the wires are partially or completely broken, the outer skin is burnt, or the core wires are exposed.

 

 

2) Touch Inspection

Touch inspection is mainly involves touching the components with your fingers, holding the component leads with tweezers and gently pulling them to see if the solder joints of the components are loose or weak.

 

 

3) Power-on Inspection

The power-on inspection must be carried out after visual inspection and touch inspection to ensure that there are no errors. This is a critical step in verifying circuit performance.

 

 

HoYoGo is a professional, reliable PCBA factory, including one-stop services from upstream electronic component procurement to PCB production and processing, SMT placement, PCBA testing, finished product assembly etc. We not only have various PCB production experience, but also can provide you with preferential prices to meet your customization needs.

评论

发表评论

此博客中的热门博文

What are the Advantages and Disadvantages of the OSP Technology

图片
     With the continuous development of the electronics industry, there are more and more PCB surface treatment technologies, and each technology has its own merits. OSP is a commonly used surface treatment technology process, what are its advantages and disadvantages?       Compared with other surface treatment technologies, OSP is somewhat different.  It uses a chemical method to produce an organic film on the clean bare copper surface, which acts as a barrier between the copper and the air.   OSP is organic, not  metallic,   and its cost is lower than most surface treatment technologies.     Advantages: With this organic film, it can resist the attack of moisture in the air without being oxidized before welding,  can withstand the test of high temperature, maintain good activity, and has a good tinning ability.  This layer of organic film will not cause damage to the sheet material. It can be easily removed by the solder resist during soldering. It can solder the copper wire and the
阅读全文

What PCBA Problems Can AOI Inspect

图片
        With the development of science and technology, the volume of PCBA is getting smaller and more precise, and some defects in processing cannot be distinguished with the naked eye, so AOI has appeared.  So what PCBA problems can AOI inspect?   The working principle of AOI is to first collect and input parameters such as images, component positions, solder joints and other parameters of the good-quality board.   During the inspection, the instrument automatically scans the circuit board and automatically captures the image, and then compares the collected data with the pre-entered parameters to determine whether the characteristics of solder joints, components and other aspects are consistent. If the data is inconsistent, the d efect  will be flagged through the display for maintenance personnel to repair.     AOI is mainly used to inspect solder paste printing, component placement and soldering. For example: too much or too little solder paste,   solder paste printing offset;  co
阅读全文

The Role of Shield Cover in PCB Design

图片
  SHENZHEN HOYOGO ELECTRONIC TECHNOLOGY CO., LTD. specializes in providing overall PCBA electronics manufacturing services, and can also provide customers with a full range of value-added services: including SMT assembly, PCB program development, schematic design, PCB layout and routing, Bom list matching, component procurement and other services. Do you know the role of shield cover in PCB design? What is a Shield Cover? The shield cover is an alloy metal cover, which is a vital component to reduce the radiation of the display. It is used in MID or VR products, which can effectively reduce the mutual interference between modules. It is common in the isolation between the main control function module and the power module and the Wifi module. The  P urpose of  S hield  Cover   C lip Generally, there are products that use wireless communication, and shield frames are usually designed on the circuit board to isolate electromagnetic interference (EMI). However, to make the shield frame fun
阅读全文