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北京型内燃机车的车架边梁采用A3钢板焊成箱形结构,由压型槽钢、下盖板和中间隔板三部分组成。边梁长11米,宽230毫米,高300毫米。压型槽钢由三段拼接而成(见图1)。为了满足下工序车架组焊要求,边梁焊后在全长范围内应有上挠度20～22毫米,旁弯不大于5毫米。因为两条纵向角焊缝(焊角8毫米)设置在边梁下部两侧(见图1),不对称于边梁的几何轴线中心。原来焊接时,由于上下不对称加热,所以焊后产生46
Beijing-based diesel locomotive frame side beam welded steel box structure with A3, the pressure channel, the lower cover and the middle partition composed of three parts. The side beams are 11 meters long, 230 mm wide and 300 mm high. Compression channel made of three splicing (see Figure 1). In order to meet the requirements of the next process frame assembly welding, beam welding in the full range of the length of the deflection should be 20 to 22 mm, side bend not more than 5 mm. Because the two longitudinal fillet welds (8 mm fillets) are located on the lower side of the side members (see Figure 1), they are not symmetrical about the geometric axis center of the side members. The original welding, due to asymmetric heating up and down, so 46 after welding