Reserch On The Welding Techniques And Joint Performance Of The X80 Pipeline Steel

On the basis of the ananlysis and research of the foreign relevant technique standard and the chemistry composition of X80 pipe steel, this dissertation is thorough to study the function and influence of each metal alloy chemical element; Join together the our country in recent years the fulfillment of steel factory and pipe factory researches to manufacture, putting forward the domestic X80 the main technique in function in composition, mechanics in chemistry parameter of the line steel, provided the support for the perfect X80 in establishment the line steel technique requisition.This dissertation contrapose the problem of thickset, the part softened and frailty of the hot influence area at the X80 the pipeline steel welding process to proceed turn the thorough research, including little the influence of the chemical element oxide, the crystal size affects, weld influence of the hot importation deal, and put forward the concrete request, for establish to weld craft guarantee the function of the hot influence rises key function.The technique projects and technics design for the loop weld technology of X80 pipe steel has been proposed in this dissertation, including groove design, welding material selection and welding parameter determinate etc. Passing by the many simulate spot welding to experiment, all weld for completely meeting request , and well to weld technique in the welding process, welding joint according to API 1104 standard resquested proceeding mechanics functions examining, the result up to standard request . The welding technique project can apply the engineering practice and rises very big function for the application of X80 pipeline steel.This dissertation is applied the half-automatic weld in high high strength pipeline steel wreath weld for the first time, this study result has the function of propulsion and promotion to welding technique project of the high strength pipeline steel.