Research on Charpy Impact Energy of LSAW Pipe

Along with the development of the TMCP technology,in order to control the cost by the steel works,the contents of alloy elements as added in the pipeline steel plate is getting less and less,which directly leads to the decrease of Charpy impact energy of the weld seam of the finished linepipe.To enhance the Charpy impact energy of the said linepipe,two types of welding wires,and five welding agents are selected to conduct the cross-matching test to the welding materials of the X65 LSAW pipe;and analyses are made for the impact energy,the chemical composition and the microstructure of the weld subjected to different welding material matching solutions so as to determine the best solution.The test result is worth using as the reference for welding of the micro-alloyed linepipe steel in similar steel grade in the future.