ASSEMBLED SLAB, METHOD FOR MANUFACTURING SAME, AND METHOD FOR MANUFACTURING CLAD STEEL MATERIAL

Provided is a slab assembly that is composed of clad raw workpieces each including a base metal plate and a cladding plate stacked together. When the slab assembly is rolled to manufacture clad steel plates, the base metal plates and the respective cladding plate can be bought into sufficiently tight contact with each other, and clad steel plates can be manufactured efficiently and stably.Two clad raw workpieces are disposed such that their cladding plates face each other, and a release material is interposed between the cladding plates. A spacer is disposed along four sides of cladding plates. Welding is performed along abutting surfaces between each spacer and the base metal plates such that metal welds having respective deepest portions located inside the respective base metal plates are formed. Each abutting surface has a portion in which a corresponding metal weld forms a joint located in a region extending from a surface of the spacer to a position located at 50% or more and less than 100% of the thickness T5 of the spacer. A width W (mm) of each metal weld along the surface of a corresponding base metal plate, a length D (mm) of a straight line M connecting a center of the width W of the metal weld and its deepest portion, and an angle A(°) between the straight line M and a corresponding abutting surface satisfy D/W ≥ 5 and 1 ≤ A ≤ 15.