焊
hàn · HSK 7
to weld
🔥🔧 fire radical 火 + 旱 (hàn, drought) for sound = weld with fire
焊 — fire radical 火 + 旱 (drought, phonetic)
焊 is a semantic-phonetic compound. The fire radical 火 signals the meaning—joining metal with heat—while 旱 (hàn, drought) supplies the sound. It originally referred to soldering or welding metal, and that remains its core meaning today.