近来,人们极为关注棚车的技术状态,因为棚车由于车体,特别是由于地板、端墙和车门不良而需要经常进行摘车修理。有相当大的一部分运用棚车,车顶腐蚀锈穿,侧墙板有裂缝、裂口和其他一些缺陷,而且由于车辆段以不换车顶就进行大修的车辆“凑数”,这种情况就变得更加严重。这类车辆由于车顶腐蚀的加剧在大修后3～5年就不能用了。现在,车辆段是用电焊来修补这类锈蚀部位的。但是,对薄钢板施焊,劳动量很 Recently, there has been a great deal of attention on the state of the art of box cars, as box cars often require pick-up repairs due to bodywork, especially due to poor floor, end wall and door closures. A considerable part of the use of box cars, the corrosion of the roof rust wear, the side wall cracks, cracks and other defects, and because the depot to replace the roof for overhauls vehicles “make up” this situation becomes more serious. Such vehicles can not be used 3-5 years after the overhaul due to increased roof corrosion. Now, the depot is welded to repair such rust sites. However, the thin-plate welding, the amount of labor