High quality, fairly expensive soldering equipment is available at Omega Verksted. Please be careful with it, and ask a board member if you are unsure about something.
Soldering is a method for chemically joining items using heat. There are many types of soldering, but by far the most common is using a tin alloy to join copper parts. This is a staple of electronics manufacturing, and the focus of this article. The "Basics" section will give you some very condensed core insights to get started with soldering without missing important information.
See also: Soldering Equipment
Advanced
Although the following information could be useful for a beginner as well, you shouldn't be too concerned with it if you are just starting out. Soldering is the best way to learn soldering.
Inspection
Various errors can be detected by closely inspecting the solder joint. A microscope will come in handy.
Error | Description | Cause | Action |
---|---|---|---|
Cold soldering | Solder joint displays wrinkles, stripes or lines. Solder may be clearly separate from the component and/or the copper PCB. | Soldering temperature was too low. Usually thermal conduction is too poor (tip too small or not clean), or the joint was not heated for long enough. | Remove solder, clean and resolder. Make sure to solder for ~2-5 seconds with an appropriate tip. |
Delamination | PCB becomes deformed. Layers of the PCB may come apart. | PCB was overheated. Usually the joint/circuit was heated for too long. | (Irreparable) |
Overheated joint | Solder has a finely grained, crystalline appearance. | Solder was overheated. Usually the joint/circuit was heated for too long. | Remove solder, clean and resolder. Make sure to solder for ~2-5 seconds with an appropriate tip. |
Porous solder | Solder joint has many small holes and/or grainy surface | Solder was overheated, combined with contamination. Usually the joint/circuit was heated for too long. | Remove solder, clean and resolder. Make sure to solder for ~2-5 seconds with an appropriate tip. |
Icicles | Icicle-like structures or spikes | Solder was cooled down too fast. | Add plenty of flux and reheat for better wetting. |
Solder bridges | Connections (short circuits) between pads or pins | Too much solder on the tip, often in combination with insufficient flux. | Remove solder bridges, add plenty of flux and reheat. |
Dewetting | Solder has not flowed to all regions of the pad | Poor wetting, caused by contamination or insufficient flux. | Remove solder and clean. Preapply solder ("fortinn" loddestedet) before resoldering. Make sure to solder for ~2-5 seconds with an appropriate tip. |
Dross | Charred areas on the surface of the solder | Contamination in solder, on components or on PCB. | Remove solder, clean and resolder. Make sure to solder for ~2-5 seconds with an appropriate tip. |
Crack | Cracks in the solder joint | Movement in the joint before solder has cooled. | Remove solder, clean and resolder. Make sure to solder for ~2-5 seconds with an appropriate tip. |