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Analysis & Improvement Methods of SMT Short Circuit Defects
Short circuit is one of the most common soldering defects in SMT production. It occurs when adjacent solder joints, circuits or component terminals are accidentally connected by excess solder, resulting in circuit failure and abnormal functions.

Main Causes of Short Circuit

  1. Unreasonable PCB pad design and too narrow spacing;

  2. Excessive solder paste volume, oversize or deformed stencil aperture;

  3. Unreasonable soldering speed and abnormal reflow temperature profile;

  4. Insufficient flux coating and poor soldering wettability;

  5. Poor solderability and oxidation of component pins;

  6. PCB scratching and extrusion after solder paste printing.

Prevention & Improvement Measures

  1. Optimize PCB pad layout and follow standard spacing design;

  2. Adjust stencil aperture, thickness, squeegee pressure and printing speed;

  3. Optimize reflow heating rate and soaking time to avoid solder paste collapse;

  4. Select matched flux to ensure sufficient activity and wettability;

  5. Strict incoming material inspection, reject oxidized and deformed components;

  6. Standardize PCB handling process to avoid scratching after printing.

Although short circuit is a common defect, batch occurrence will seriously affect production yield and delivery. Comprehensive control in PCB design, stencil making, solder paste printing and reflow process can effectively avoid such problems.
Globalwell has established complete control standards to prevent short circuits in SMT production. Strict process review and on-site inspection greatly reduce common soldering defects and ensure stable production quality.


 

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