🔍 Key Concepts

• Purpose of tinning a soldering iron tip • How metal surfaces react to heat and air (oxidation) • Why a thin coat of solder is applied before storage or use

💭 Think About

• Think about what happens to clean, bare metal when it is repeatedly heated in air. • Why do technicians want a shiny, solder-covered tip instead of a dry, discolored one? • Which option describes a chemical/ surface protection effect rather than a mechanical or weight change?

✅ Before You Answer

• Identify which choice deals with chemical protection of the metal surface, not physical strength or mass. • Consider which effect is actually caused by a thin solder coating, not by changing the iron’s temperature settings. • Eliminate options that focus on weight or physical damage instead of surface condition when hot.