Soldering Iron Temperature Guide (Settings Chart)

Temperature is one of the most misunderstood parts of soldering. Beginners often crank the iron as hot as it goes, thinking it’ll be faster — and then wonder why their joints and tips suffer. Here’s how to get it right.

The quick chart

These are starting points, not laws. The guiding rule: use the lowest temperature that lets you make a clean joint in about 2–3 seconds.

Why hotter isn’t better

A regulated iron holds whatever temperature you set, so running it hot doesn’t help — it hurts:

• Flux burns off instantly, before it can clean the joint, so solder won’t flow well.
• Components get damaged by excess heat.
• Tips oxidize fast, going black and dead (see tip care).
• Pads can lift off the board.

What actually makes soldering fast is wattage (heat recovery), not temperature. A 60W iron recovers heat between joints quickly even at a moderate temperature — which is why a good station matters more than a sky-high number.

Reading your joints

Let the joint tell you if the temperature is right:

• Too cold: solder balls up instead of flowing, joints look dull, grainy or blobby. → Raise the temperature 10–20°C, add flux.
• Too hot: flux smokes the instant it touches, the tip discolors quickly, boards scorch. → Lower it.
• Just right: solder flows smoothly and wets the joint in 2–3 seconds, leaving a smooth cone.

Don’t forget the variables

Two joints can need different settings:

• Bigger thermal mass (thick wire, ground planes, large pads) pulls heat away, so it needs more — raise the temperature or use a broader tip.
• A clean, tinned tip transfers heat far better than a dirty one, so tip condition matters as much as the dial.

Set a sensible temperature, keep your tip clean, and practice reading your joints on a cheap practice board. Combine this with our beginner guide and good joints become second nature.