Development of Thermite Powder for Rail Joining with Recycled Iron Oxide and Aluminium Powder

Choi, Sang-kyu; Park, Sung-sang; Baek, Eung-Ryul

doi:2012.30.5.40

J Weld Join > Volume 30(5); 2012 > Article

Journal of KWJS 2012;30(5):40-45.
DOI: https://doi.org/10.5781/KWJS.2012.30.5.40 Published online November 30, 2012.

재활용 산화철 및 알루미늄 분말을 활용한 철도레일 이음용 테르밋 분말 개발

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Development of Thermite Powder for Rail Joining with Recycled Iron Oxide and Aluminium Powder

Sang-kyu Choi, Sung-sang Park, Eung-Ryul Baek

Abstract

  Nowadays in Republic of Korea, whole amount of the thermite welding powder for rail joinning is dependent on import. However the demand of the thermite welding powder would be enlarge because some constructing high-speed train and city metro projects are currently in progress. In addition this is the main reason why we should develop the thermite welding powder, domestically. This study is focused on utilizing the recyclable materials like Al powders from cans and iron oxide scales from wire rods as the main components of the thermite welding powder. By minimizing Al content in weld zone by controlling the mixing ratio of the Al powder in the thermite welding powder, the excessive dissolution of the Si and Mn components came from the Al powders could be controled. The tensile strength of welding zone in welded rail was 740 MPa, with that the developed thermite welding powder.

Key Words: Thermite, Thermite powder, Rail welding, Recyclabe aluminium