40
Implementing a Defect Tracking ToolA Process Improvement War Story.ppt
Implementing a Defect Tracking ToolA Process Improvement War Story...
35
[工学]Reflow defect analysis_4.ppt
[工学]Reflow defect analysis_4

smt process training

reflow soldering defects analysis
回流焊缺陷分析 回流焊缺陷分析

learning objectives/学习目的 学习目的 1. know the common defect 了解常见缺陷类型 ฀ 2.analysize the possible cause 分析可能的原因 ฀ 3untermeasure for the defects 基于以上原因采取的对策

2

tombstoning/ 立碑
• chip components standing on a terminal end (tombstoning). 片式元件末端翘起(墓碑)

3

tombstoning/ 立碑
countermeasure/ 对策 mechanism: surface tension in component terminal is uneven in reflow. 原理:在回流过程中零件两末端的表面张力不均 衡. 1mponent terminal heat distributed unevenly 零件两末端受热分布不均衡. insufficient soak time: reflow profile optimization. 保温区时间太短:优化回流曲线参数. 2. pcb pad design issue (the pads distance is too big): improve pcb pad design. pcb焊盘设计问题(焊盘间距太大):改善pcb焊 盘设计.
4

tombstoning/ 立碑
countermeasure/对策
3mponent terminal oxidization or contamination : solderability test if necessary
12
defect-part(失效分析)-射出成型.pdf
defect-part(失效分析)-射出成型
8
~Defect Detection and Classification in Citrus Using Computer Vision.pdf
DefectDetection ClassificationinCitrus Using Computer VisionJose J. Lopez, Emanuel Aguilera, MaximoCo
102
【经管类】零缺陷管理ZERO DEFECT MANAGEMENT.ppt
【经管类】零缺陷管理ZERO DEFECT MANAGEMENT
12
No apparent defect, disease, or disability (see Worksheets DS-3025.pdf
DS-2054Page 05-2009第一页 U.S. Department State美国国务院 MEDICAL EXAMINATION REFUGEEAPPLICANT TBTechnical I
4
On the defect treatment of foundation and foundation reinforcement_139.doc
On the defect treatment of foundation and foundation reinforcement_139
9
A Man-Machine Interface on the Cloud for Automatic Defect Detection.pdf
A Man–Machine Interface on the Cloud for Automatic Defect Detection
11
Defect pool in amorphous-silicon thin-film transistors PhysRevB 45 4160.pdf
Defect pool in amorphous-silicon thin-film transistors PhysRevB 45 4160Defect pool in amorphous-silicon thin-film transistors PhysRevB 45 4160Defect pool in amorphous-silicon thin-film transistors PhysRevB 45 4160

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