page_title: Slag (welding)
section_title: Processes
hierarchical_section_title: Slag (welding) / Processes
context_page_description: Welding slag is a form of slag, or vitreous material produced as a byproduct of some arc welding processes, most specifically shielded metal arc welding, submerged arc welding, and flux-cored arc welding. Slag is formed when flux, the solid shielding material used in the welding process, melts in or on top of the weld zone. Slag is the solidified remaining flux after the weld area cools.
context_section_description: Four welding processes use flux in slag-producing manners:
  Shielded metal arc welding, also known as SMAW
  Flux-core arc welding, also known as FCAW or FC
  Submerged arc welding
  Electroslag welding
caption: Electroslag welding process, showing slag
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