US 12,343,816 B2
Aluminum-coated blank, manufacturing method thereof and apparatus for manufacturing aluminum-coated blank
Chang Yong Lee, Incheon (KR); Jeong Seok Kim, Incheon (KR); Sung Ryul Kim, Incheon (KR); and Tae Woo Kwon, Incheon (KR)
Assigned to Hyundai Steel Company, Incheon (KR)
Filed by Hyundai Steel Company, Incheon (KR)
Filed on Mar. 14, 2024, as Appl. No. 18/605,122.
Application 18/605,122 is a continuation of application No. 17/089,483, filed on Nov. 4, 2020, granted, now 11,958,131.
Claims priority of application No. 10-2020-0066525 (KR), filed on Jun. 2, 2020.
Prior Publication US 2024/0217032 A1, Jul. 4, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. B23K 26/322 (2014.01); B23K 35/02 (2006.01); B23K 103/04 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01)
CPC B23K 26/322 (2013.01) [B23K 35/0261 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); B23K 2103/04 (2018.08)] 8 Claims
OG exemplary drawing
 
1. A method for manufacturing an aluminum-coated blank, comprising:
aligning two or more aluminum-coated steel sheets such that an edge of one of the aluminum-coated steel sheets faces an edge of the other aluminum-coated steel sheet; and
providing a filler wire to the facing portions of the aluminum-coated steel sheets, and melting the facing portions of the aluminum-coated steel sheets and the filler wire by laser beam irradiation from a laser head to form a joint,
wherein the steel sheets are joined together by irradiating a laser beam so as to form a pattern angle that is formed between the formation direction of the joint and the movement path of the laser beam on the surface of each of the coated steel sheets,
wherein the laser beam has a frequency of about 100 to 1,500 Hz and a power of about 1 to 20 KW,
wherein the joint is formed at a speed of about 15 to 170 mm/sec,
wherein each of the aluminum-coated steel sheets comprises:
a base steel sheet comprising an amount of about 0.01 to 0.5 wt % of carbon (C), an amount of about 0.01 to 1.0 wt % of silicon (Si), an amount of about 0.5 to 3.0 wt % of manganese (Mn), an amount of greater than 0 but not greater than about 0.05 wt % of phosphorus (P), an amount of greater than 0 but not greater than about 0.01 wt % of sulfur(S), an amount of greater than 0 but not greater than about 0.1 wt % of aluminum (Al), an amount of greater than 0 but not greater than about 0.001 wt % of nitrogen (N), and the balance of iron (Fe) and other inevitable impurities; and
a coating layer comprising aluminum (Al) and formed on at least one surface of the base steel sheet in a coating weight of 20 to 100 g/m2, wherein the coating layer comprises a surface layer formed on the surface of the base steel sheet and containing 80 wt % or more of aluminum (Al) based on the total weight of the surface layer; and wherein the coating layer comprises an alloy layer formed between the surface layer and the base steel sheet and containing aluminum-iron (Al—Fe), aluminum-iron-silicon (Al—Fe—Si) intermetallic compounds, and an amount of 20 to 70 wt % of iron (Fe) based on the total weight of the alloy layer.