人们越来越意识到,日益增长的交通运输量能够而且必须由对环保有利的铁路系统所承担。瑞士联邦铁路已向其国内的车辆工业提出了开发和建造Mark Ⅳ型标准车辆的任务。此后不久,与该工业部门达成一项协议,瑞士工业公司(SIG)将致力于转向架的开发和制造。本文报道应用于该项目的焊接技术和质量保证情况。 There is a growing awareness that the growing volume of traffic can and must be borne by the environmentally-friendly rail system. The Swiss Federal Railroad has proposed to its domestic vehicle industry the task of developing and building a Mark IV standard vehicle. Shortly thereafter, with an agreement with the industrial sector, SIG will focus on the development and manufacture of bogies. This article reports the welding technology and quality assurance applied to the project.