Assertion: welding | /r/Desires | a form of shield
Facets:
value: to protect melted metals
type: PURPOSE
Source sentences:
text: Welding also requires a form of shield to protect the filler metals or melted metals from being contaminated or oxidized.
text: Welding also requires a form of shield to protect the filler metal from being contaminated or oxidized, which is the loss of electrons and causes iron oxide (better known as rust) to form on the metal.