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.

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.

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.

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.

Optimization of Process Parameters for Submerged Arc Welding by Weighted Principal Component Analysis Based Taguchi Method

2012 ◽  
Vol 622-623 ◽  
pp. 45-50 ◽  
Author(s):  
Joydeep Roy ◽  
Bishop D. Barma ◽  
J. Deb Barma ◽  
S.C. Saha
Keyword(s):  
Principal Component Analysis ◽  
Taguchi Method ◽  
Arc Welding ◽  
Principal Component ◽  
Traverse Speed ◽  
Component Analysis ◽  
Submerged Arc Welding ◽  
Bead Geometry ◽  
Weighted Principal Component ◽  
Submerged Arc

In submerged arc welding (SAW), weld quality is greatly affected by the weld parameters such as welding current, traverse speed, arc voltage and stickout since they are closely related to weld joint. The joint quality can be defined in terms of properties such as weld bead geometry and mechanical properties. There are several control parameters which directly or indirectly affect the response parameters. In the present study, an attempt has been made to search an optimal parametric combination, capable of producing desired high quality joint in submerged arc weldment by Taguchi method coupled with weighted principal component analysis. In the present investigation three process variables viz. Wire feed rate (Wf), stick out (So) and traverse speed (Tr) have been considered and the response parameters are hardness, tensile strength (Ts), toughness (IS).

Development of Exothermic Flux for Enhanced Penetration in Submerged Arc Welding

2020 ◽  
Vol 19 (01) ◽  
pp. 131-146
Author(s):  
Aditya Kumar ◽  
Kulwant Singh
Keyword(s):  
Mathematical Model ◽  
Arc Welding ◽  
Welding Process ◽  
Submerged Arc Welding ◽  
Graphical Form ◽  
Welding Parameters ◽  
Weld Penetration ◽  
Agglomeration Process ◽  
Arc Welding Process ◽  
Submerged Arc

An exothermic flux for submerged arc welding process has been developed which is capable of enhancing weld penetration of the joint. For this purpose, thermit mixture in different proportions (20% and 40%) has been added to the parent flux by agglomeration process. Beads on plate were deposited using parent and developed exothermic fluxes for a comparative study. EH14 filler wires in combination with parent and exothermic fluxes were used in this investigation. The effects of welding parameters and exothermic flux on weld penetration were investigated and the results have been presented in this paper. It has been found that the penetration increases from 2.95 to 3.51[Formula: see text]mm with 40% thermit mixture addition to the parent flux. It is further observed that penetration increases with increase in the amount of thermit mixture added. A mathematical model has been developed to predict weld penetration or select suitable welding parameters to obtain the desired penetration. The significance of coefficients was tested using Student’s [Formula: see text]-test and the adequacy of developed model was tested using [Formula: see text]-test. The effects of various parameters on penetration have been presented in graphical form for better understanding.

scholarly journals Research on technological capabilities of double-electrode welding of long fillet welds

2019 ◽  
Vol 298 ◽  
pp. 00072
Author(s):  
Andrei Fiveyskiy ◽  
Aleksei Mosin ◽  
Sergey Zverev ◽  
Ilya Polevoy
Keyword(s):  
Arc Welding ◽  
Submerged Arc Welding ◽  
Fillet Welds ◽  
Technological Capabilities ◽  
Weld Formation ◽  
Double Electrode ◽  
Single Arc ◽  
Submerged Arc ◽  
Stable Formation

The article presents the results of a research of the technological capabilities of double-electrode submerged arc welding of elongated fillet welds with a leg of 8 mm or more in one pass while ensuring high-quality and stable formation of weld. As the result of the research we reviewed the features of the fillet weld formation during welding of metal strips with a thickness of 14 mm with different locations of the welding wires in the torch relative to the axis of the welded joint. Consequently we determined the best option in terms of the quality of the weld formation and increase in welding productivity as compared with the two-pass single-arc welding. The conditions and parameters of the single-pass double-electrode (“split electrode welding”) submerged arc welding are established, providing a welding speed of up to 35 m / h.

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