Clean the base metal of rust, mill scale, and oil. Use a wire brush or grinder to ensure a "shiny" surface for better arc stability.

In the world of welding, standardization is key to quality and safety. The American Welding Society (AWS) and the ISO (International Organization for Standardization) have developed a numerical system to classify welding positions. Among these, the stands out as one of the most challenging yet common positions welders face on the job site.

The designation isn't commonly used in basic welding position terminology; however, understanding it requires knowledge of basic welding positions: