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１前言近几年来，随着城市人口的增多，轻型城市轨道交通系统开始在国内一些大中城市受到青睐，并成为缓解城市交通拥挤，解决无轨交通污染的重要手段。1999年我单位在大连市政改造工程中参加了大连轻轨无缝线路的施工，采用移动式气压焊接技术对50kg/m钢轨进行了现场焊接，焊
1 Introduction In recent years, with the increase of urban population, the light rail transit system in cities began to be favored in some large and medium-sized cities in China and has become an important measure to ease urban traffic congestion and solve the problem of trolley-borne traffic pollution. In 1999, our unit participated in the construction of Dalian light rail seamless railway in Dalian Municipal Rehabilitation Project. Welded 50 kg / m rail was welded on the site by using mobile air pressure welding technology. The welding