Why is there a problem of slag inclusion on the surface during laser welding?

During the welding process, the surface slag inclusions that can be seen from the outside mainly appear between layers. Cause:  A. During multi-layer multi-pass welding, the interlayer coating is not clean; or the surface of the previous layer of weld is not smooth or the surface of the weldment does not meet the requirements. B.… Continue reading Why is there a problem of slag inclusion on the surface during laser welding?