Soldering: Basics for Beginners

Short: Soldering permanently joins metal parts by melting a filler metal into the joint, which solidifies on cooling. The technique is used both in electronics and for pipe connections in home systems.

In more detail: In electronics, soft soldering typically melts below 450 degrees Celsius, which is much gentler on sensitive components than brazing.

In detail

• Preparing the soldering iron: A clean, tinned tip transfers heat efficiently and prevents cold solder joints.
• Flux: Dissolves oxide layers on the metal surfaces and helps the solder flow and adhere evenly.
• Heating the parts: The parts to be joined, not the solder itself, should be heated so the solder flows in cleanly.
• Recognizing a cold joint: Dull, grainy surfaces indicate an unclean connection that may break later.
• Electronics vs. pipes: Electronics soldering mostly uses lead-free solder with a low melting point, while pipe joints often use brazing filler with higher strength.
• Safety: Good ventilation is important, since soldering can produce harmful fumes, especially with leaded solder.
• Desoldering: Faulty joints can be reopened with a desoldering pump or wick to replace components (silikonfuge-erneuern, bohren-in-wand-duebel-richtig-waehlen).