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The combination of pressure pipes fittings means used two or more than two adjacent pieces of a tube connected through the field welding (pipe) as a whole design, processing and assembly. Fittings is an important accessory for connecting pressure piping systems, site welding methods they use to connect, but due to the complexity of the situation at the scene, the poor environment of welding, weld quality is difficult to guarantee a lot of hidden dangers, and thus the security implications. Using a combination of pressure pipe fittings, not only can reduce the workload of field welding, to improve the integrity of the pipeline system, continuity and consistency, reduce safety hazards caused due to welding defects, reducing pressure pipeline safety accidents, but also for improving the steel utilization, resources and product cost savings, speed up the progress of the project and so will bring greater social and economic benefits. In this paper, the combination of pressure pipe fittings from three aspects-depth analysis of research. First of all, a combination of research and development pressure pipe fittings dedicated modular design software. Visualbasic6. 0 platform for secondary development of AutoCAD software, the modular design of the combination of pressure pipe fittings. The software has a very important role in improving the universality of the combination of pressure pipe fittings applications, to shorten the design and manufacturing cycle. Second, the combination of pressure pipe fittings structure mechanical properties of numerical analysis. Combination of three-way elbow fittings, for example, compared welding pipe fittings and the composite pipe stress and strain difference, the following conclusions: (1) pipe combination weld area smooth combination of fittings stress fluctuations. Fittings combination of (2), the combination of tube member due to the structural unity, the displacement of the tubular body as a whole substantially no impact; contrary, the welded structure of the tube member axially and circumferentially to the displacement has a greater impact. (3) fittings combination tube away from the weld area. Finally, the combination of tube forming process and process parameters, in-depth discussions and research. Through theoretical analysis and calculation of the size of the internal pressure and axial force required in the forming process as well as the relationship between, for example, a combination of three-way Reducing fittings, established a three-way reducer combination of tube forming process of its hydroforming the steps, load path and forming limit, a very important guiding significance for the actual production.
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