Manufacturing process of annular hot-pressing welding joint for metal pipeline connection

Abstract

The invention discloses a manufacturing process of an annular hot-pressing welding joint for metal pipeline connection. According to the manufacturing process, the annular hot-pressing welding joint is manufactured through a powder metallurgy process to serve as a grafting part in welding connection of different kinds of metal pipes, and welding of the different kinds of metal pipes is converted into welding of the same kind of metal; a simple annular hot-pressing cover die is adopted, and metal annular materials prepared in advance are clamped in the middle of the annular hot-pressing cover die to serve as a pressurizing part pressure head and a connected object; component proportioning layers with gradually-changed components are laid between the metal annular materials layer by layer according to the principle of gradually-changed components; in the heating and pressurizing process, the component proportioning layers with the gradually-changed components are sintered into a component gradual change part, meanwhile, the metal annular materials and the component gradual change part are metallurgically combined, machining is conducted after sintering is completed, and a welding joint end half groove is machined in order to be matched with a pipe fitting half groove in a metal pipeline to be welded to form a whole groove; and the whole process meets the requirements for weldingmanufacturability and quality and the requirements for construction conditions at the same time.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy technology, in particular to a manufacturing process of an annular hot-press welding joint for connecting metal pipelines. Background technique [0002] The welding of different types of metal pipes is a difficult problem in material processing. When the physical properties and thermodynamic properties of the two metal pipes to be welded are quite different, it is usually necessary to strictly select and test the welding process and welding materials. In fact, In most cases, even if the welding process and welding materials are selected through theoretical analysis, it is generally difficult to obtain the desired welding interface and welding quality in actual operation, because the welding process of metal materials is essentially carried out at the metal material interface The rapid remelting and recondensation process of local materials is usually accompanied by the filling of new wel...

AI Technical Summary

Problems solved by technology

[0002] The welding of different types of metal pipes is a difficult problem in material processing. When the physical properties and thermodynamic properties of the two metal pipes to be welded are quite different, it is usually necessary to strictly select and test the welding process and welding materials. In fact, In most cases, even if the welding process and welding materials are selected through theoretical analysis, it is generally difficult to obtain the desired welding interface and welding quality in actual operation, because the welding process of metal materials is essentially carried out at the metal material interface The rapid remelting and recondensation process of local materials is usually accompanied by the filling of new welding materials. The difference in heat conduction / heat transfer of different metal materials and the elemental recombination of dissimilar materials during the welding process are uncontrollable, coupled with the operational stability of the welding process itself Poor controllability of process parameters and process parameters, resulting in very complex welding stress and brittle phases that are difficult to predict and control at the welding interface, which directly affects the welding effect and determines the success or failure of the welding

[0003] In addition, in engineering construction, the metal pipes to be connected may be in very complex working conditions, such as suspended structures or buried pipes. If the two metal pipes to be connected belong to different types of metal materials, the welding conditions and personnel operating experience The lower the requirements, the more likely it is to realize welding connections, because many special welding processes are completely unable to operate in complex environments

Images