Assertion: solder's flux | /r/HasProperty | nonmetallic chemical
Facets:
Source sentences:
text: Usually (though not always) you add other materials as you apply the heat: a filler (an extra piece of metal, supplied from something called a welding rod, which seals up any gaps where the main metals meet) and a flux (a nonmetallic chemical that helps to stop the molten metals forming oxides and nitrides with gases in the air, which weakens the joint).