Influence Analysis of the Controllable Factors on the Objective Functions for Optimizing the Welding of PE 100 Pipelines for Natural Gas Distribution

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1164.25 ◽

2021 ◽

Vol 1164 ◽

pp. 25-33

Author(s):

Marius Cocard

Keyword(s):

Natural Gas ◽

Welded Joint ◽

Welding Process ◽

Objective Functions ◽

Response Surface Design ◽

Gas Distribution ◽

Surface Design ◽

Controllable Factors ◽

Welding Procedure ◽

Experimental Researches

The paper presents a series of experimental researches performed using the design of experiments method RSD (Response Surface Design) for modeling and optimizing the welding process of PE 100 pipelines, used in natural gas distribution. In this sense, the aim was to analyze the influence of controllable factors such as pressure, temperature and time on the objective functions, aiming to obtain certain characteristics of the welded joint. By modeling the welding process, based on the results obtained, an optimal welding procedure was established and validated to meet the conditions imposed on the objective functions.

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New Low Alloy High Strength Steel Welding Procedure Evaluation

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.814.238 ◽

2019 ◽

Vol 814 ◽

pp. 238-241

Author(s):

Wen Juan Li

Keyword(s):

High Strength Steel ◽

Welded Joint ◽

Welding Process ◽

High Strength ◽

Hardness Test ◽

Ultrahigh Strength Steel ◽

New Type ◽

Welding Procedure ◽

Test Result ◽

Reliable Basis

In order to determine the weldability of a new type of low alloy high strength steel, the feasibility of the proposed welding process was examined and the welding procedure qualification of a new type of ultrahigh strength steel WELDOX 1100 was carried out through the weldability test of the welded joint, the small iron research and the highest hardness test. . The test result satisfies the specification requirements and proves that the proposed welding process plan is correct and feasible. It provides a reliable basis for the preparation of welding process documents and ensures the smooth development of the company's new products.

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Modeling of Heat Transfer in Pipeline Steel Joint Performed by Submerged Double-Arc Welding Procedure

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.814.33 ◽

2013 ◽

Vol 814 ◽

pp. 33-40 ◽

Cited By ~ 1

Author(s):

Dan Catalin Birsan ◽

Elena Scutelnicu ◽

Daniel Visan

Keyword(s):

Heat Transfer ◽

Arc Welding ◽

Welded Joint ◽

Pipeline Steel ◽

Welding Process ◽

Temperature Fields ◽

Welding Procedure ◽

Thermal Sources ◽

Submerged Arc ◽

Process Productivity

Submerged arc welding is the most applicable and productive procedure when thick sections have to be welded. Nevertheless, the manufacturers of pressure vessels, pipelines, ships and offshore structures keep on looking for new and modern design solutions of equipments and technologies which should lead to increase of welding process productivity. For instance, the longitudinal welds of pipelines are, mostly, performed by submerged arc welding procedure with multiple arcs and/or multi-wires, such as twin, tandem or twin-tandem, in order to increase the process productivity. However, achievement of optimal mechanical properties of the welded joint should remain the most important quality criteria. It is well known that dependence of the mechanical and metallurgical changes on heat transfer plays a major role in obtaining of safe welded structures and preserving of their structural integrity. That is why the investigation of heat transfer induced by the welding process is required. Furthermore, setting of distance between thermal sources and its influence on the overlapping phenomenon of temperature fields should be explored when submerged double-arc welding procedure is applied. Three dimensional finite element model of butt welded joint - used for simulation of heat transfer in pipeline steel joint performed by submerged double-arc welding process - is developed and described in this paper. Numerical results and a comparative analysis related to the temperature distribution, thermal history, and temperature variation in cross section of the welded joint at different time steps are discussed. Finally, important conclusions regarding the influence of distance between thermal sources on thermal effects and temperature fields overlapping are drawn.

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