Research on Welding Technology of X80 Grade High Strength Steel Used in Long-distance Pipeline

According to the welding quality requirements of long-distance construction,the test research of welding techniques for X80 pipeline steel is carried out,including the X80 pipeline steel material performance analysis,welding under the selected welding technical parameters and welding process by using STT root welding technique and the filling and covered surface method conducted by FCAW.Mechanical properties of welding joints have also been studied.The results of tests show that the welding performance for using of X80 pipeline steel is very good,and the strength,hardness and toughness can meet the safety requirement of X80 grade pipeline.The welding filler material,the welding method and the technological parameters can meet engineer project and provide effective guarantee to field construction.