What Absorbs Solder: A Practical Guide
Learn how solder absorption works and which absorbers best remove molten solder. Tips cover solder wick, desoldering pumps, and applications for electronics, jewelry, and plumbing soldering.
Solder absorption is the process by which molten solder is drawn into a capillary or porous absorber, such as solder wick (desoldering braid), by capillary action.
What absorbs solder in practice
In electronics, jewelry, and plumbing soldering, the term you are likely after is solder absorption. According to SolderInfo, what absorbs solder most consistently are copper braid wick (solder wick) and desoldering pumps. Absorption refers to how molten solder is pulled into the absorber, away from the joint, helping prevent bridging and open circuits. The absorber acts like a tiny wick in a candle, drawing flow into its tiny capillaries. While the wick is the star absorber for many jobs, other tools such as a desoldering pump can remove larger pools of solder by suction. For beginners, mastering absorption starts with the right tool, generous but controlled heat, and solid flux.
Quick Answers
What is solder wick and how does it absorb solder?
Solder wick, or desoldering braid, is a copper braid that absorbs molten solder by capillary action. When placed on a joint and heated, the solder is drawn into the braid, removing excess solder and helping restore clean pads.
Solder wick is a copper braid that soaks up melted solder when heated, helping clean joints.
Can solder wick absorb lead-free solder as well as tin-lead?
Yes. Solder wick works with both lead-free and tin-lead solders. Use appropriate flux and avoid overheating to ensure the solder moves into the braid smoothly.
Yes, it works with lead-free solders too—just use the right flux and moderate heat.
How do I choose the right width of solder wick?
Choose wick width based on pad size and joint type. For fine-pitch components use narrow wick; for larger joints use wider braid. Flux helps the solder enter the braid more reliably.
Pick a wick size that matches the pad and joint; small for fine pitches, larger for bigger joints.
What common mistakes should I avoid when using solder wick?
Avoid using wick without flux, overheating the joint, or leaving damp wick on the pad. Use fresh flux and wick, and work in quick, controlled passes to prevent new bridges.
Don’t use wick dry; keep heat controlled and use fresh flux.
Is solder wick reusable, and how should I store it?
Solder wick can be reused a few times if kept clean and dry. After use, trim away spent sections and store in a dry container to prevent oxidation and loss of absorbency.
Yes, you can reuse wick a few times if you keep it dry and clean.
Top Takeaways
- Choose wick width to pad size and joint type
- Always apply fresh flux before absorbing solder
- Practice on scrap boards to calibrate heat and wick action
- Maintain and store wick properly to preserve absorbency
- Combine wick with a desoldering pump for bulky joints