Solder (धातु मिश्रधातु)
Flux (फ्लक्स – साफ और चिपकाने वाला पदार्थ)
Let’s understand both in detail.
🧪 What is Solder?
Solder is a metal alloy that melts at low temperature to join two metal surfaces. It provides a strong, conductive, and permanent bond between electrical parts.
🔧 Types of Solders
| 🧰 Type of Solder | ⚙️ Composition | 🌡️ Melting Point | 📝 Uses |
|---|---|---|---|
| Soft Solder (60/40) | 60% Tin + 40% Lead | ~180°C | General electrical wiring, circuits |
| Hard Solder | Brass/Silver alloys | 400°C – 600°C | Mechanical joints, strong bonds |
| Silver Solder | Silver + Copper/Zinc | 620°C – 660°C | Precision electronics, high strength |
| Lead-Free Solder | Tin + Copper/Silver | 215°C – 230°C | Environment-friendly, electronics |
| Rosin-Core Solder | Tin + Lead + Rosin core | ~180°C | Electronics (with built-in flux) |
🧪 What is Flux?
Flux is a chemical substance used in soldering to:
Clean metal surfaces
Remove oxidation
Improve solder flow
Ensure a strong bond
🔬 Types of Flux
| 🔧 Type of Flux | 📋 Description | 🧰 Use In |
|---|---|---|
| Rosin Flux | Made from tree resin, mild, non-corrosive | Electronics, PCB work |
| Acid Flux | Strong cleaning agent, corrosive | Plumbing, metalwork (Not for electronics) |
| Water Soluble Flux | Water-based, easy to clean, mild to moderate action | Electrical circuits (cleaned after use) |
| No-Clean Flux | Leaves minimal residue, no need to clean | Modern PCBs, small electronics |
🧠 Choosing the Right Solder and Flux
✅ Use rosin-core or soft solder for most electrical jobs
✅ Avoid acid flux in electronics – it can damage components
✅ For eco-safe work, use lead-free solder
✅ Always apply flux separately if using plain solder wire
⚠️ Safety Tips
Work in a well-ventilated space (flux fumes can be harmful)
Use eye protection when soldering
Always clean the joint after soldering (if using acid/water-soluble flux)
Store flux and solder safely and label them properly
🧠 Summary
| 🔍 Material | ✅ Key Point |
|---|---|
| Solder | Joins electrical conductors using heat |
| Flux | Cleans and prepares surfaces for better bonding |
| Rosin Flux | Best for electronics – safe and non-corrosive |
| Soft Solder | Most common in ITI-level wiring and PCB work |