7.5.3 Soldering Surface Mount Gull Wing Components, Hot Gas Method

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Outline

This procedure covers the general guidelines for soldering surface mount Gull Wing components. There is basically only one type of Gull Wing component. Whether leads are on two sides or four sides, or whether the component is large or small, the soldering principles are the same.

Minimum Skill Level - Intermediate

Recommended for technicians with skills in basic soldering and component rework, but may be inexperienced in general repair/rework procedures.

Conformance Level - High

This procedure most closely duplicates the physical characteristics of the original, and most probably complies with all the functional, environmental and serviceability factors.

Procedure References
1-0	1.0 Foreword
2-1	2.1 Handling Electronic Assemblies
2-2	2.2 Cleaning Procedures
2-5	2.5 Baking and Preheating
7-1-1	7.1.1 Soldering Basics
7-1-2	7.1.2 Preparation For Soldering And Component Removal
7-1-3	7.1.3 Solder Joint Acceptance Criteria

Tools and Materials

Cleaner
General purpose cleaner for removing contamination.

Flex-Rack PCB Holder
Sturdy rack for PCBs used for rework and positioning.

Heat Shield Kit
Includes materials to protect heat sensitive area of a PCB during rework.

Hot Air Tool
Tool and nozzles to deliver precise flow of hot air.

Microscope
Precision microscope with stand and lighting for work and inspection.

Precision Tool Set
Nine precision-crafted tools for detailed circuit board work.

Solder Paste
Solder paste for component soldering and rework.

Soldering Skills Practice Kit
Training kit to practice circuit board soldering skills prior to testing for certification.

Wipes
Nonabrasive, low-linting wipes for cleanup.

Procedure

Procedure

Add a small bead of solder paste along the row of pads. (See Figure 1)
Place the component in position.
Adjust the pressure and temperature output of the hot air tool.
Direct the hot air over the component with the hot air tool tip approximately 2.50 cm (1.00") from the solder joint. This initial heating will pre-dry the solder paste.
Note: Solder paste has a dull flat appearance when dried.
When the solder paste has dried, move the hot air tooltip to approximately 0.50 cm (0.20") above the component. Move the tool back and forth to heat all the solder joints until complete solder melt is observed. (See Figure 2)
Remove the tool. Wait a moment for the solder to solidify.
Clean, if required, and inspect.

Images

Soldering Surface Mount Gull Wing Components, Hot Gas Method

Add a small bead of solder paste along the row of pads.

Move the tool back and forth to heat all the solder joints until complete solder melt is observed.