When soldering ferrous metals, which factor can cause a weak joint if not controlled?
Insufficient surface preparation
A sound soldered joint depends on the solder wetting and bonding to clean base metal.
If the surfaces are not properly prepared, that is, not cleaned of oxide, grease, and scale, the solder cannot wet the metal and instead sits on the contamination, giving a weak, poorly bonded joint.
This is especially critical on ferrous metals, which readily form oxide films, so insufficient surface preparation is the factor that must be controlled.
Using the correct solder, a reasonable amount of solder, and a suitable flux matter too, but the option that directly causes a weak joint here is poor surface preparation.
Hence, the answer is Insufficient surface preparation.
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