Doosan Enerbility Co., Ltd.

Doosan Heavy Industries & Construction Co., Ltd

Pukyong National University

Hyun Sang Kong

Ho Sung Lee

Eun Jong Oh

Gyeong Hee Nam

Yoon Sang Lee

Sang Myung Cho

Hyo Jin Baek

Hyeong Chang Ryu

Kyeong Seob Lim

Jae Yun Shin

Chang Ik Lee

Jae Bong Lee

Yoo Yang

Sang Beom Nam

The opening machining apparatus for the heat transfer tube includes an electric discharge machining device inserted into the heat transfer tube and configured to form an opening in a tube wall of the heat transfer tube through an electric discharge machining, an electric discharge machining device driving device connected to the electric discharge machining device and configured to transport the electric discharge machining device, an electric discharge machining device driving device connected to the electric discharge machining device and configured to provide force for bringing the electric discharge machining device into contact with a tube wall surface of the heat transfer tube, and an electric discharge machining device rotation device configured to provide force for rotating the electric discharge machining device in a circumferential direction of the heat transfer tube in the heat transfer tube.

Opening maching apparatus for heat transfer tube, method of forming opening in tube wall of heat transfer tube using same, and method of removing foreign material through same opening of same heat transfer tube

An apparatus and method for cleaning an oxide film using a direct current reverse polarity are provided. The apparatus for cleaning an oxide film formed on a workpiece may include a power supply configured to apply direct current power and to include a positive electrode terminal and a negative electrode terminal, the workpiece configured to be electrically connected to the negative electrode terminal to act as a negative electrode to which a current is applied, and a torch having a positive electrode, which is spaced apart from the oxide film by a predetermined distance and is electrically connected to the positive electrode terminal, the torch being installed to be movable relative to the workpiece. The oxide film formed on the workpiece may be removed by applying a reverse polarity direct current between the workpiece, serving as the negative electrode, and the positive electrode to generate an arc.

Apparatus and method for cleaning oxide film

There is provided a dispensing device for a welding rod dryer. The dispensing device may include a plurality of chambers configured to receive welding rod dryers; and a connection member provided in each of the plurality of chambers and configured to supply power to the welding dryers; and a door provided at an entrance of each of the plurality of chambers.

Dispensing device for welding rod dryer

Growing community of inventors

Changwon-si, South Korea

Hyun Sang Kong