About: http://webisa.webdatacommons.org/199383426

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	However, casting skin, sand, and other foreign materials must be removed from the joint to be welded and the adjacent surfaces of the casting.
http://www.w3.org/ns/prov#wasQuotedFrom	brazing.com