Manufacturing method of bogie chassis for rail car and structure having through hollow

摘要

In welding of middle frame pipes 610, additional frames 620, caliper cabins 630, gearboxes 640, and motor cabins 650, a hollow holder 660 is inserted into each of the middle frame pipes 610, and filled with fluid 670. After that, with the holder sealed 660, arc welding is performed. Thus, welding distortion can be reduced.