GALVANIZED STEEL SHEET HAVING EXCELLENT COATING ADHESION AND SPOT WELDABILITY AND METHOD FOR MANUFACTURING THE SAME

摘要

PURPOSE: A galvanized steel sheet having excellent coating adhesion and spot weldability and a manufacturing method thereof are provided to prevent the peeling off of a plating layer by properly mounting intermetallic compound on the interface of the plating layer and a steel plate. CONSTITUTION: A hot dip galvanizing process is performed by a steel plate in a galvanizing bath, including aluminum of 0.11-0.14 weight% and having 440-460°C temperature range, under predetermined entering temperature condition. The steel sheet is a hot rolled steel sheet or cold rolled steel. A molten galvanizing steel plate has Fe-Zn alloy of 1-20% formed on the interface between a substrate iron and a plating layer.