Mitsubishi Heavy Industries Limited

Mitsubishi-hitachi Metals Machinery, Inc.

Etsurou Hirai

Kazuya Tsurusaki

Jae-Young Lee

Kwang-Hee Han

Kozo Wada

Yuuji Asahara

Kanji Hayashi

Tsutomu Kawamizu

Ritsuo Hashimoto

Kyung-Zoon Min

Shoichi Hashimoto

Kwang-Hum Han

Si-Youl Chun

Jang-Sub Shim

Noi-Ha Cho

A steel plate splicing facility includes, a steel plate heating apparatus for retrieving and heating a preceding steel plate and a following steel plate, and a shear-joining apparatus for clamping a tail end portion of the preceding steel plate and a leading end portion of the following steel plate in an overlapping condition by a die and a clamp and shearing them with a punch, such that surfaces of the tail end portion and the leading end portion are newly formed and brought in contact with each other in order to them. The shear-joining apparatus joins the preceding and following steel plates at a temperature equal to or higher than 350&#xb0; C. and at a percentage clearance c/t equal to or lower than 5%, c/t being defined by c/t=D/(t+t)&#xd7;100 where D represents a distance between the punch and the die, and tand trepresent a thickness of respective steel plates.

Steel plate splicing facility utilizing shear joining

An alloying system for a galvanized steel sheet, the alloying system using an induction heating coil, wherein an impedance matching apparatus is provided between the induction heating coil and a high frequency power source. The impedance matching apparatus comprises a matching transformer having a plurality of intermediate contact points for arbitrarily selecting a turn ratio, and a switching device for alternative changeover of the intermediate contact point, whereby even when the load impedance of the steel sheet varies, maximum power source output is obtained, such that an appropriate heating temperature necessary for forming an alloy layer of the steel sheet can be supplied.

Impedance matching apparatus for induction heating type galvanized steel sheet alloying system and method

An alloying system for a galvanized steel sheet, using an induction heating coil, wherein the temperature of the steel sheet in an induction heating furnace is measured based on the impedance of a high frequency heater, and the amount of heating is controlled by feedback, to form an alloy layer of the steel sheet.

Alloying system and heating control device for high grade galvanized

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Hiroshima, Japan

Etsurou Hirai