ADVANCED HIGH STRENGTH ZINC PLATED STEEL SHEET HAVING EXCELLENT SURFACE QUALITY AND ELECTRICAL RESISTANCE SPOT WELDABILITY AND MANUFACTURING METHOD THEREOF

摘要

The present invention relates to a high-strength hot-dip galvanized steel sheet with excellent surface quality and electric resistance spot weldability, and a method for manufacturing same. A galvanized steel sheet, according to one aspect of the present invention, is a galvanized steel sheet comprising a base steel sheet and a zinc-based plated layer formed on the surface of the base steel sheet, wherein the ratio (a/b) of surface hardness (a) to internal hardness (b) of the base steel sheet may be less than 0.95.