WSP 110 · Welding Standard ProcedureSession 4 · Hour 1 · One arrowInstructor cue 화살은 하나.90 minNow Open · 5 min left · next Demo한ENScriptBodyClearHour 1One arrowHour 2Below and aboveHour 3Both facesHour 4The dashed twinThis browser cannot play the film.CheckThe position of the mark is the position of the weld. Below = arrow. Above = other. One arrow.