Soldering

Study Guide

Prepare to use soldering tools safely and produce reliable basic electrical connections.

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1. Soldering safety mindset

Use soldering equipment only after Engineering Safety and Soldering certification requirements are complete.
Assume the soldering iron tip and nearby metal parts are hot whenever the station is active.
Never touch the tip, wave the iron around, or leave the iron lying on the table.
Return the iron to its stand whenever it is not actively being used.
Stop and ask for help if a wire, component, board, or tool behaves unexpectedly.

2. PPE, fumes, and hygiene

Safety glasses are required when soldering or clipping leads/wires.
Use fume extraction or ventilation as instructed; avoid breathing solder fumes directly.
Keep your face out of the smoke path and position the work so fumes move away from you.
Wash hands after soldering, especially before eating or touching your face.
Keep food and drinks away from soldering stations.

3. Station setup

Clear the workspace of clutter, paper, backpacks, and unnecessary materials.
Set up the iron stand, sponge/brass wool, fume control, solder, and helping hands or fixture before turning on the iron.
Secure the board, wire, or component so both hands can be used safely.
Keep cords routed so they are not tripping hazards or tangled with the hot iron.
Know where the power switch and unplug point are located.

4. Tip care and heat transfer

A clean, lightly tinned tip transfers heat better than a dirty or oxidized tip.
Wipe the tip only with approved sponge/brass wool methods.
Do not scrape, file, or damage the soldering tip.
Heat the pad/component lead or wire first, then feed solder into the heated joint.
Do not melt solder directly onto the iron tip and drip it onto the joint.

5. Wire and component prep

Strip wire only to the needed length, avoiding nicked or cut conductor strands.
Twist stranded wire neatly when appropriate.
Tin wires when directed so solder flows into the strands before final joining.
Insert component leads cleanly and avoid bending them excessively.
Clip leads only with approved cutters and control flying pieces.

6. Solder joint quality

A good joint is shiny/smooth, properly wetted, and covers the connection without excessive solder.
A cold joint may look dull, grainy, cracked, balled-up, or poorly bonded.
A solder bridge is accidental solder connecting two points that should be separate.
Too much solder can hide problems or create shorts.
Too little solder can create weak or intermittent electrical connections.

7. Troubleshooting and repair

Inspect joints visually before powering or submitting work.
Look for bridges, cold joints, loose wires, overheated pads, melted insulation, or clipped leads left behind.
Ask before using solder wick, pumps, or rework methods.
Do not keep heating the same pad for too long; overheating can damage components or boards.
Report burns, tool damage, loose cords, or unsafe station conditions immediately.

8. Shutdown and cleanup

Turn off or unplug the station as instructed.
Return the iron to the stand and allow it to cool safely.
Dispose of clipped leads, wire insulation, scrap solder, and damaged components properly.
Return tools and leave the station clean for the next student.
Wash hands after soldering and cleanup.

Hands-on performance checklist

To earn the badge, students must demonstrate safe station setup, iron handling, joint creation, inspection, shutdown, and cleanup under teacher observation.

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