AL-6XN weld appearance can be somewhat misleading when compared to hygienic welds in 316L stainless steel. A typical AL-6XN weld will have non-uniform freeze lines and slag islands in the weld bead. The slag islands are dull or blue-gray in color and adhere to the surface. Light and dark spots on both the inside and the outside of the weld are also common. The heat-affected zone can also have discoloration and is generally a little darker than typical 316L stainless steel welds.