近几年来,焊接已取代了铸造、铆接而成为先进的工艺方法之一。在船舶、锅爐、机车车辆等的制造中,焊接已居于首要地位,特别是机械化的自动与半自动焊接,更显示了焊接的优越性。东山轮的锅爐,外径为4.8公尺,长3.2公尺,全重约40吨,均为铆接接合。因建造较久,加上长期沉没于江中,所以锈蚀很大,尤其是燃烧室更为厉害,原有的 In recent years, welding has replaced the casting, riveting and become one of the advanced technology. In shipbuilding, boilers, rolling stock and other manufacturing, welding has been the top priority, especially mechanized automatic and semi-automatic welding, but also shows the superiority of welding. Dongshan round of the boiler, the outer diameter of 4.8 meters, 3.2 meters long, all weighing about 40 tons, are riveted joints. Due to the construction of a long time, coupled with long-term sink in the river, so a lot of rust, especially in the combustion chamber is more powerful, the original