A tailor-welded blank with an aluminum-silicon plated layer and a method of manufacturing the same

Abstract

This invention belongs to the field of metallic materials, specifically relating to a welded steel plate with an aluminum-silicon coating and its preparation method. Based on a chromium-nickel-manganese ternary alloying approach, this invention eliminates the need for pre-welding coating removal or reducing the total amount of aluminum-silicon coating entering the weld seam through beveling. High-performance aluminum-silicon coated hot-formed steel welded joints can be obtained using conventional laser filler wire welding. Currently available welding wires are mainly composed of austenitic stabilizing elements, while this invention innovatively designs the welding wire composition system. The welding wire is designed using a composite of non-austenitic stabilizing elements chromium, nickel, and manganese in a specific ratio, and the chromium-nickel equivalent ratio of the welding wire is controlled to achieve full martensiticization of the weld microstructure. The purpose of this invention is to obtain welded joints reaching the level of the base material in a low-cost and high-efficiency manner, which is of great significance to the development of laser welding technology for aluminum-silicon coated steel.

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