标准21型客车钢结构的外皮,上墙板的下部(窗口上部)是压筋的车体上腰带。腰带下缘与窗口上边之间原设计相距52毫米,用一块80毫米的薄钢板(长度依窗口宽670毫米或1,000毫米而定)与上墙板(压筋腰带)搭焊连接,如图1。 这种结构的缺点是,运用中搭接焊缝逐 The standard 21 passenger car steel structure of the skin, the lower part of the wall plate (window upper part) is the body of the pressure belt on the belt. The lower edge of the waistband is 52 mm from the original design between the upper side of the window and an upper panel (ribbed belt) with an 80 mm thin steel sheet (670 mm or 1,000 mm in length depending on the window length) as shown in Figure 1 . The disadvantage of this structure is the use of lap welds