Effect of Welding Parameters on Temperature Field during Twin-Wire Submerged Arc Welding of X80 Pipeline Steel

2013 ◽  
Vol 652-654 ◽  
pp. 2347-2351
Author(s):  
Chun Yan Yan ◽  
Xin Zhao ◽  
Song Ya Tian ◽  
Sheng Xun Xu ◽  
Bai Qing Ma ◽  
...  
Keyword(s):  
Temperature Field ◽  
Temperature Distribution ◽  
Welding Speed ◽  
Arc Welding ◽  
Pipeline Steel ◽  
Submerged Arc Welding ◽  
Welding Parameters ◽  
X80 Pipeline Steel ◽  
Welding Temperature ◽  
Submerged Arc

The welding temperature field of twin-wire submerged arc welding (SAW) in an X80 pipeline steel welded joint was analyzed using a three-dimensional (3D) finite element (FE) model. Taking into account nonlinear relationships between temperature and mechanical properties, a coupled thermo-mechanical FE solution was used to obtain the temperature distribution for varying set of welding conditions. Effect of welding speed, inter wire spacing on welding temperature field were studied and presented. It is found that welding speed and inter wire spacing play a significant role in deciding the temperature distribution of twin-wire submerged arc welding. Simulation results were well consistent with theoretical analysis.

Numerical Analysis of Microstructure and Residual Stress in the Weld Zone of Multiwire Submerged Arc Welding

2016 ◽  
Vol 139 (2) ◽  
Author(s):  
Enlin Yu ◽  
Yi Han ◽  
Haixiang Xiao ◽  
Ying Gao
Keyword(s):  
Residual Stress ◽  
Temperature Measurement ◽  
Arc Welding ◽  
Large Diameter ◽  
Weld Zone ◽  
Submerged Arc Welding ◽  
Welding Parameters ◽  
Welding Quality ◽  
Welding Temperature ◽  
Submerged Arc

As oil and gas pipelines develop toward large throughput and high pressure, more and more attention has been paid to welding quality of oil pipelines. Submerged arc welding is widely applied in manufacturing of large-diameter welded pipes, and the welding quality has an impact on pipeline safety. With a multiwire submerged arc welding test platform and real-time temperature measurement system, temperature measurement has been done for multiwire submerged arc welding process with and without flux coverage, respectively. As a result, thermal cycling curves in both cases have been obtained, and convection and radiation coefficients of flux-covered X80 pipeline steel in air-cooled environment have been corrected. By using sysweld software, a finite-element computational model was set up for microstructure and residual stress in the weld zone of multiwire longitudinal submerged arc welding. Comparative experiment has been done to obtain welding temperature field with relatively high accuracy. Calculation and analysis of residual stress versus preheat residual stress decreased with increasing preheat temperature up to 100 °C, meanwhile content of bainite in microstructure fell, facilitating reduction in residual stress to some extent. This study provides quantitative reference for further optimization of welding parameters and improvement in weld mechanical properties.

Parameter optimization of flux-aided backing-submerged arc welding by using Taguchi method

2017 ◽  
Vol 31 (16-19) ◽  
pp. 1744046 ◽  
Author(s):  
Juan Pu ◽  
Shengfu Yu ◽  
Yuanyuan Li
Keyword(s):  
Taguchi Method ◽  
Welding Speed ◽  
Arc Welding ◽  
Welding Current ◽  
Submerged Arc Welding ◽  
Weld Bead ◽  
Welding Parameters ◽  
Welding Quality ◽  
Submerged Arc

Flux-aided backing-submerged arc welding has been conducted on D36 steel with thickness of 20 mm. The effects of processing parameters such as welding current, voltage, welding speed and groove angle on welding quality were investigated by Taguchi method. The optimal welding parameters were predicted and the individual importance of each parameter on welding quality was evaluated by examining the signal-to-noise ratio and analysis of variance (ANOVA) results. The importance order of the welding parameters for the welding quality of weld bead was: welding current [Formula: see text] welding speed [Formula: see text] groove angle [Formula: see text] welding voltage. The welding quality of weld bead increased gradually with increasing welding current and welding speed and decreasing groove angle. The optimum values of the welding current, welding speed, groove angle and welding voltage were found to be 1050 A, 27 cm/min, 40[Formula: see text] and 34 V, respectively.

Three-Dimensional Temperature Field Numerical Simulation of Twin-Arc High-Speed Submerged Arc Welding Process Based on ANSYS

2011 ◽  
Vol 216 ◽  
pp. 188-193 ◽  
Author(s):  
Kuan Fang He ◽  
Xue Jun Li ◽  
Ji Gang Wu ◽  
Qi Li
Keyword(s):  
Temperature Field ◽  
Welding Speed ◽  
Arc Welding ◽  
Molten Pool ◽  
High Speed ◽  
Weld Seam ◽  
Welding Process ◽  
Submerged Arc Welding ◽  
Temperature Fields ◽  
Submerged Arc

Based on analysis of submerged arc welding arc heat source model and droplet heat inputting uniform distribution, ANSYS parametric design language was applied to develop sub-program for loading moving heat sources. ANSYS software was used to calculate the temperature fields. In the same welding conditions, weld seam width and depth value of experiments and simulation are contrasted, the biggest error was below 5%. The influence of different welding speed to molten pool temperature of twin-arc submerged arc welding was analyzed, it obtained results that temperature field distribution of twin-arc submerged arc welding changes more gentle than single arc submerged arc welding in condition of increased welding speed, it was helpful to the further analysis of molten pool dynamic behavior and weld seam shape factors of twin-arc high speed submerged arc welding.

Design of TiO2–SiO2–MgO and SiO2–MgO–Al2O3-Based Submerged Arc Fluxes for Multipass Bead on Plate Pipeline Steel Welds

2019 ◽  
Vol 141 (4) ◽  
Author(s):  
Lochan Sharma ◽  
Rahul Chhibber
Keyword(s):  
Arc Welding ◽  
Pipeline Steel ◽  
Welding Process ◽  
Submerged Arc Welding ◽  
Pressure Vessels ◽  
Welding Parameters ◽  
Chemical Compositions ◽  
Optimization Approach ◽  
Low Alloy Steels ◽  
Submerged Arc

High strength low alloy steels are extensively used in different applications like oil and gas transmission line pipes, pressure vessels and offshore oil drilling platforms. Submerged arc welding (SAW) is mainly used to weld high thickness steel plates. Flux composition and welding parameters play an important role in determining the adequate quality and mechanical properties of the weld. Agglomerated fluxes were formulated based on TiO2–SiO2–MgO and SiO2–MgO–Al2O3 flux system using constrained mixture design and extreme vertices design approach. The chemical compositions of the bead on a plate have been studied using formulated fluxes. Twenty-one beads on plates were applied using submerged arc welding process keeping the parameters: current, voltage, and welding speed constant. Regression models were developed for bead on plate content in terms of individual, binary, and ternary mixture flux constituents for submerged arc multipass bead on plate deposition for pipeline steel (API 5 L X70). In the present study, chemical composition, grain size, and microhardness properties of the multipass bead on a plate (for API 5 L X70 grade pipeline) were optimized using multi-objective optimization approach.

Influence of Welding Parameters on Weld Appearance and Mechanical Properties in Twin-Wire Tandem Submerged Arc Welding of HSLA Steel

2013 ◽  
Vol 753-755 ◽  
pp. 358-362 ◽  
Author(s):  
Chun Yan Yan ◽  
Jian Cheng Huang ◽  
Lin Wang ◽  
Di Zhu ◽  
Shun Zhen Yang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Welding Speed ◽  
Arc Welding ◽  
Hsla Steel ◽  
Submerged Arc Welding ◽  
Weld Bead ◽  
Welding Parameters ◽  
Weld Appearance ◽  
Submerged Arc ◽  
Tandem Submerged Arc Welding

Effects of welding parameters on the weld bead appearance and mechanical properties in twin-wire tandem submerged arc welding of a high-strength low-alloy steel were investigated. Steel plates were welded using different combinations of welding current, voltage, inter-wire spacing and welding speed. The weld joints were characterized in detail by metallography. Hardness and tensile properties of the specimens were measured. The experimental analysis reveals that good weld appearance can be obtained for a range of inter-wire spacing from 55mm to 80mm. Leading wire current, trailing wire voltage and welding speed are the major factors affecting weld bead profile and microstructures in weld metal and fusion zone. Greater welding speed tends to produce higher cooling rate and favors the formation of strengthening phases like acicular ferrite and bainitic structures resulting in better mechanical properties.

A Simplified Numerical Approach for Finding the Temperature Distribution in Submerged arc Welding Process

2012 ◽  
Vol 622-623 ◽  
pp. 315-318
Author(s):  
Aparesh Datta ◽  
Subodh Debbarma ◽  
Subhash Chandra Saha
Keyword(s):  
Temperature Distribution ◽  
Heat Source ◽  
Arc Welding ◽  
Welding Process ◽  
Numerical Approach ◽  
High Heat ◽  
Submerged Arc Welding ◽  
Fusion Welding ◽  
Arc Welding Process ◽  
Submerged Arc

The quality of joining has assumed a greater role in fabrication of metal in recent years, because of the development of new alloys with tremendously increased strength and toughness. Submerged arc welding is a high heat input fusion welding process in which weld is produced by moving localized heat source along the joint. The weld quality in turn affected by thermal cycle that the weldment experiences during the welding. In the present study a simple comprehensive mathematical model has been developed using a moving heat source and analyzing the temperature on one section and then the temperature distribution of other section are correlated with time delay with reference analyzed section.

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