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Journal of KWJS 2007;25(4):72-78.
Published online September 21, 2007.
Nd:YAG 레이저를 이용한 알루미늄도금강판의 용접성(Ⅱ)용접부내 알루미늄의 거동
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Welding Characteristics of Aluminized Steel Sheet by Nd:YAG Laser(Ⅱ) - Behavior of Al element in the weld -
Jong-Do Kim, Jung-Han Lee, Ki-Chol Kim
Abstract
  Aluminized steel sheet is a material with excellent heat resistance, thermal reflection and corrosion resistance. It has wide applications, owing to its low cost and excellent performance, in the petrochemical industry, electric power and other energy conversion systems, etc and has attracted the attention of many investigators. But the welding of aluminized steel sheet has a problem of decreasing tensile-shear strength, caused by mixed Al in the weld. This study investigated behavior of Al and its structural properties to resolve this problem. Several analysis equipment(SEM, EDX, EPMA) were used to investigate Al element in the weld. Also microhardness tester and TEM equipment were used to find the intermetallic compound. As a result of this study, Al-rich zones existed in the weld and Fe-Al intermetallic compounds were found in these zones. At the same time, the weldability of aluminized stainless steel sheet was investigated and compared with that of aluminized steel sheet. Although there is a difference between the base metal of the low carbon steel and stainless steel, it is interpreted that a behavior of Al element in the weld is similar.
Key Words: Aluminized steel sheet, Laser welding, Behavior of Al, Intermetallic compound, Aluminized stainless steel sheet


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