2. Manual THT & rework
Manual soldering inherently introduces process variation. Relying on subjective techniques rather than documented standards increases defect rates and compromises long-term product reliability.
Strict guidelines govern equipment selection (tip geometry), thermal management, and rework procedures. Translating subjective actions into measurable quality metrics—specifically defining physical characteristics of a properly wetted solder joint—achieves consistency, repeatability, and quantifiable reliability across manual soldering operations.
- 2.1 Hand soldering foundations
Hand soldering is a required process for rework, repair, and specialized low-volume assembly, executing tasks that automated processes cannot perform. The reliability of hand soldering requires treati...
- 2.2 Fluxes, alloys and aids
While strict technique is required, the manual soldering process is governed by the chemistry of the selected materials. This chapter outlines the physical requirements for selecting wire solder, flux...
- 2.3 Rework flow control
Reworking complex surface mount devices, such as BGAs and QFNs, is a critical operation requiring strict process control. Success depends on executing precise thermal profiles that minimize stress on...
- 2.4 Defect atlas & acceptance
Defect evaluation is a strict function balancing quality assurance, throughput, and manufacturing yield. To eliminate subjective judgment, inspection personnel are required to utilize **IPC standards*...
- 2.5 Data logging & repair tickets
Manual and mixed-technology assembly processes—particularly THT insertion, wave soldering, and complex rework—generate critical quality data. This chapter outlines required data logging protocols and...
- 2.6 Rework & repair techniques
Manual rework and repair are invasive procedures that induce localized thermal and mechanical stress to the printed circuit board assembly (PCBA). Unlike automated SMT assembly, manual rework bypasses...