现在各铁路局焊铺无缝线路方法大都相同,均先在焊轨厂以接触焊或气压焊焊成200～250米的长轨,再用长轨列车运卸到工地,现场以铝热焊焊成2,000米左右的长段,然后按规定换铺并锁定,即成为温度应力式无缝线路。这种方法主要有两大问题。一是要巨资建厂,施工程序复杂,运输干扰大,成本较高。二是造成轨道上有两种性能不同的钢轨焊接接头。其中铝热焊接头强度低,质量差,折断率高,成为无缝线路中的薄弱环节。 At present, the methods of welding seamless lines by railway administration are mostly the same. They are all welded to the long rail of 200 to 250 meters at the welding track factory by contact welding or gas pressure welding, and then transported to the site by the long-rail train. Welded into a long section of about 2,000 meters, and then in accordance with the provisions of shop and lock, that is, become temperature stress-type seamless line. This method has two main problems. First, we must invest heavily to build factories, construction procedures are complex, transport interference, high cost. Second, there are two kinds of rails on the track resulting in different performance welded joints. One aluminum welded joints of low strength, poor quality, high breaking rate, a seamless link in the weak links.