大直径输气管道焊接热循环的复制研究

Research on Welding Thermal Cycle Replication of Large Diameter Gas Pipeline

为了研究影响试样和钢管焊接热循环参数的主要因素,乌克兰巴顿焊接研究所进行了一系列大直径输气管道焊接热循环的复制研究试验,提出了3种试验台上固定试样的方法。研究结果表明,所有规格的大直径输气管道焊缝的焊接热循环参数t8/5都可以用宽度200 mm以上的试样焊接复制,小宽度的试件则取决于焊接线能量和试件厚度的比例大小,管道在较高的初始温度下焊接后,焊缝金属的冲击韧性会有所降低。

In order to study the main factors affecting welding thermal cycle of specimen and steel pipe,a serious of replication studies were conducted for welding thermal cycle of large diameter gas pipeline in Ukraine Barton Welding Research Institute,and 3 kinds of fixing sample methods on test bed were put forward.The results indicated that the welding thermal cycle parameter t8/5of all sizes of large diameter gas pipeline weld can copy by using the sample with width more than200 mm,the specimen with small width depends on the welding energy and proportion to the specimen thickness.After welding under higher initial temperature,the impact toughness of weld metal will be decreased.