{"id":2447,"date":"2020-05-07T18:05:29","date_gmt":"2020-05-07T10:05:29","guid":{"rendered":"http:\/\/www.wmxray.com\/?p=2447"},"modified":"2023-11-27T10:15:35","modified_gmt":"2023-11-27T02:15:35","slug":"what-are-the-main-defects-that-the-wellman-x-ray-inspection-system-can-find-on-the-through-hole-pth-of-pcb","status":"publish","type":"post","link":"https:\/\/wmxray.com\/vi\/what-are-the-main-defects-that-the-wellman-x-ray-inspection-system-can-find-on-the-through-hole-pth-of-pcb\/","title":{"rendered":"What are the main defects that the Wellman X-ray inspection system can find on the through-hole PTH of PCB?"},"content":{"rendered":"

PTH (Plating Through-hole) is a common process on a printed circuit board (PCB), but the surface of the hole drilled directly on the PCB is only resin, which is not conductive. Therefore, we plated a layer of copper on the surface of the drill hole, so that different copper foil layers can conduct electricity.<\/span><\/h3>\n
\"through-hole\"

through-hole<\/span><\/p><\/div>\n

\"PTH\"

PTH<\/span><\/p><\/div>\n

When we insert the pins of the components into the through-holes and then solder the tin into the through-holes by wave soldering machine, the question comes: is the through-hole filled with tin? How can I know if the welding is reliable?<\/span><\/h3>\n

We know that when the naked eye cannot see the defects inside the product, you can only choose X-ray to see through it. However, when observing the through-hole, we can only see from the side whether tin has filled the through-hole. At this time, you need an X-ray inspection system with a tilt function, such as Wellman X6800 and X8800, both of which have a 60 \u00b0 tilt function.<\/span><\/h3>\n

Industry standards and IPC clearly state that the through-hole welding rate must exceed 75%.<\/span><\/h3>\n

As shown in the figure below, we can see that each through-hole is 100% filled with tin, and only a few through-holes are not “covered” with tin. So we can confirm that the pins have been soldered firmly.<\/span><\/h3>\n
\"through-hole

through-hole X-ray inspection OK<\/span><\/p><\/div>\n

The through-holes in the picture below are not so good. Not only are most of the through-holes not covered with tin, but there are two through-holes with less than 75% welding rate. This may cause the components to not be fixed to the PCB and fall off easily, and also cause the two through-holes to be non-conductive and unable to achieve certain functions.<\/span><\/h3>\n
\"through-hole

through-hole X-ray inspection NG<\/p><\/div>","protected":false},"excerpt":{"rendered":"

PTH (Plating Through-hole) is a common process on a printed […]<\/p>","protected":false},"author":1,"featured_media":3165,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[],"class_list":["post-2447","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nWhat are the main defects that the Wellman X-ray inspection system can find on the through-hole PTH of PCB? - Wellman X-Ray<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/wmxray.com\/vi\/what-are-the-main-defects-that-the-wellman-x-ray-inspection-system-can-find-on-the-through-hole-pth-of-pcb\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What are the main defects that the Wellman X-ray inspection system can find on the through-hole PTH of PCB? 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