建筑施工中,需用大量的钢管做脚手架和模板支撑架。由于结构不同,往往需将长钢管割断使用,天长日久,就积压了一批批废旧短钢管。短钢管能不能用对焊的方法将其接长呢?我 In construction, a large number of steel pipes are used as scaffolding and formwork support. Because of the different structure, it is often necessary to cut off the long steel pipe. As time goes by, it will backlog a batch of waste short steel pipes. Can a short steel pipe be lengthened by butt welding? I