Welding Analysis And Research On Matching Welding Materials For Q460E Steel

Presently the primary problem of oil derrick is the cumbersome structure can not match the development of oil equipment desiring modularization,movement and higher intensity. In allusion this problem, it is a reasonable method to use high strength steel instead of traditional steel. A series of weld experiments were made using the Q460E steel as base metal. The results show that its weld has high intensity and good low-temperature toughness, which can replace those traditional steel used by actual oil derrick manufacture. Because of its lighter weight and higher intensity, it can completely satisfy the development of oil equipment desiring higher movement level and intensity, which is propitious to modularization and efficiency of oil derrick manufacture.Base on it, though the mechanical property and microstructure, a deep research was made on the influence of different alloy element. Though analysis, it is found that multiple micro alloying and strictly controlling to the S,P content of welding materials can improve the properties of weld joins effectively, especially adding appropriate Ni,Mo with other micro alloys can improve the low-temperature toughness of weld joins significantly. Being upon this, though adjusting the alloy systems and formulation of electrode coating, a kind of 55kg class low-hydrogen electrode was trial-produced, and it was used to test weld Q460E steel. The results show that the electrode can fully meet the weld requirements of Q460E steel, and improve low-temperature toughness significantly, which can offer a better choice on welding materials for high strength steel such as Q460E steel.The welding residual stress of Q460E steel has an important impact on its structure safety and life which is used as high strength and load-bearing structure steel. In order to study its residual stress level and distribution, a numerical simulation was made about the welding process with the software Ansys, and an in-deep analysis was made on the instantaneous changes in the law of temperature field,stress field and strain field. In order to verify its accuracy of the numerical simulation result, a test was made on the residual stress of test plates. The results show that the numerical simulation result and the actual test result inosculated well, which can be used as an effective method to forecast the welding residual stress of important structure and provide scientific reference for the optimization to weld process.