I am wondering why sometimes the slag left from a 7018-1 rod is sometimes really hard to break off or instead off chipping of in pieces it crushes it to a powder? This occurs to me occasionally while welding root passes or even a hot pass. My bead will be flat, smooth, and perfectly stacked with no undercutting or discoloration of the weld. However instead of the slagging peeling off or chipping off easily it will be super hard to remove. I chip soon as the slag has cooled to a brown color and sometimes wait longer, but never while it is still orange hot. Any sugestions?