About: http://webisa.webdatacommons.org/417143198

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	A shielding gas such as carbon dioxide or blends of argon with carbon dioxide and/or oxygen may be supplied during the welding process to support the arc and prevent the molten metal reacting with oxygen and nitrogen in ambient air.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com