Craft · 6 pages · 12 min
Why flux exists
Flux clears oxide so molten solder or braze can wet bare metal instead of balling up.
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From the opening
Flux is a material laid on a joint so molten solder or braze can wet bare metal. It exists because heat grows oxide on copper, brass, and steel faster than filler can bond, and oxide will not take that filler. The opening covers oxide blocks molten filler, flux cleans and then blankets, and spent flux stops the wetting.
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Inside
- Oxide blocks molten filler
- Flux cleans and then blankets
- Spent flux stops the wetting
- Acid flux can keep eating
- Where the idea stops applying
- A distinction worth keeping
Sources
- Oxide films blocking solder wetting
- Rosin and chloride soldering fluxes