Category Archives: Quality


Mar26
What is AOI? What Defects Can 2D AOI Detect in PCB Assembly?

post on March 26, 2024

AOI (Auto Optical Inspection) is an automated optical recognition system that has become widely used in the electronics industry for inspecting the quality of soldering, component placement accuracy and the presence of missing components on PCBA (Printed Circuit Board Assembly) … Continue reading →

Process, Quality, SMT, Test/Inspection     WorkingBear    Views (9,891)     comment (0)
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Feb27
What is Graping Solder Defect in SMT Assembly? How to Fix it?

post on February 27, 2024

In the reflow soldering process of Surface Mount Technology (SMT) in electronic assembly, the occurrence of “Graping” solder defect refers to the situation where the solder paste does not completely melt and joint together during reflow. Instead, individual solder powders … Continue reading →

Process, Quality, SMT, Soldering     WorkingBear    Views (8,873)     comment (0)
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Feb15
NWO (Non-Wet-Open) Defect in BGA Soldering: Causes and Possible Solutions

post on February 15, 2024

Recently, many have inquired about how to deal with Non-Wet-Open (NWO) issues when encountering BGA packaged ICs soldering. The defects associated with NWO are quite similar to those of HIP (Head-in-Pillow) and typically occur at the edges and corners of … Continue reading →

Process, Quality, SMT, Soldering     WorkingBear    Views (7,228)     comment (0)
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Feb06
Purpose of Using Lead-Free Low-Temperature Solder (LTS) SnBi, SnBiAg in Soldering

post on February 6, 2024

The alloy composition of lead-free LTS (Low Temperature Solder) usually includes the metal “bismuth (Bi)” in addition to tin (Sn) to lower its eutectic point. The commonly used lead-free solder SAC305 has a melting point of 217°C, while Sn64Bi35Ag1 has … Continue reading →

Quality, Reliability, SMT, Soldering     WorkingBear    Views (5,473)     comment (0)
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Jan30
8D Report: Problem Analysis and Solving

post on January 30, 2024

The “8D report” is a tool commonly used in the electronics assembly industry for “problem analysis and solving.” Due to its systematic and clear steps, the “8D report” is often utilized in responding to customer complaint cases. The term “8D” … Continue reading →

Management, Quality     WorkingBear    Views (10,015)     comment (0)
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