Mechanical Behaviour of Welded Joints Achieved by Multi-Wire Submerged Arc Welding

2017 ◽  
Vol 1143 ◽  
pp. 52-57
Author(s):  
Elena Scutelnicu ◽  
Carmen Catalina Rusu ◽  
Bogdan Georgescu ◽  
Octavian Mircea ◽  
Melat Bormambet
Keyword(s):  
Mechanical Behaviour ◽  
Welded Joints ◽  
Arc Welding ◽  
Base Material ◽  
High Strength ◽  
Submerged Arc Welding ◽  
Steel Plates ◽  
Wire Saw ◽  
Api 5L X70 Steel ◽  
Submerged Arc

The paper addresses the development of advanced welding technologies with two and three solid wires for joining of HSLA API-5l X70 (High-strength low-alloy) steel plates with thickness of 19.1 mm. The experiments were performed using a multi-wire Submerged Arc Welding (SAW) system that was developed for welding of steels with solid, tubular and cold wires, in different combinations. The main goal of the research was to assess the mechanical performances of the welded joints achieved by multi-wire SAW technology and then to compare them with the single wire variant, as reference system. The welded samples were firstly subjected to NDT control by examinations with liquid penetrant, magnetic particle, ultrasonic and gamma radiation, with the aim of detecting the specimens with flaws and afterwards to reconsider and redesign the corresponding Welding Procedure Specifications (WPS). The defect-free welded samples were subjected to tensile, Charpy V-notch impact and bending testing in order to analyse and report the mechanical behaviour of API-5l X70 steel during multi-wire SAW process. The experimental results were processed and comparatively discussed. The challenge of the investigation was to find the appropriate welding technology which responds simultaneously to the criteria of quality and productivity. Further research on metallurgical behaviour of the base material will be developed, in order to conclude the complete image of the SAW process effects and to understand how the multi-wire technologies affect the mechanical and metallurgical characteristics of the API-5L X70 steel used in pipelines fabrication.

Microstructure and Mechanical Properties of Extra High Strength Heavy Steel Plate for Bridge Application

2014 ◽  
Vol 783-786 ◽  
pp. 859-866 ◽  
Author(s):  
Dong Sheng Liu ◽  
Chong Xiang Yue ◽  
Huan De Chen ◽  
Bing Gui Cheng
Keyword(s):  
Mechanical Properties ◽  
Arc Welding ◽  
Steel Plate ◽  
Control Process ◽  
High Strength ◽  
Submerged Arc Welding ◽  
Steel Plates ◽  
Weathering Steel ◽  
Weld Joints ◽  
Submerged Arc

Key parameters for thermomechanical control process (TMCP) and integrated welding operations have been determined to industrialize extra high strength micro-alloyed low carbon SiMnCrMoNiCu steel plates for bridge applications. Confocal Scanning Microscope was used to make In-situ observation on austenite grain growth during reheating. A Gleeble 3800 thermomechanical simulator was employed to investigate transformation behavior of the TMCP conditioned austenite. Integrated industrial rolling trial was conducted to correlate the laboratory observations and commercial production of the plates. Microstructure factors affecting the toughness of the steel were analyzed. Submerged-Arc Welding (SMAW) trails were conducted and the structures and mechanical properties of the weld joints characterized. The representative plate with thickness of 60 mm consisted of acicular ferrite (AF) + refined polygonal ferrite (PF) + granular bainite (GB) across the entire thickness section exhibit yield strength (YS) greater than 560 MPa in transverse direction and excellent Charpy V Notch (CVN) impact toughness greater than 100 J at-40 °C in the parent metal and the weld joints. These provide useful integrated database for producing advanced high strength steel plates via TMCP. Keywords: Thermo-Mechanical Control Process;Weathering Steel Plate for Bridge; Submerged-Arc Welding without Preheating

The Benefits of a Modified-Chemistry, High-Strength, Low-Alloy Steel

1987 ◽  
Vol 3 (02) ◽  
pp. 111-118
Author(s):  
John C. West
Keyword(s):  
Heat Input ◽  
Arc Welding ◽  
High Strength ◽  
Submerged Arc Welding ◽  
Low Alloy Steel ◽  
Labor Costs ◽  
Lower Strength ◽  
The Cost ◽  
High Degree ◽  
Submerged Arc

Steels with 50 ksi and up yield points usually acquire their strength from some form of heat treatment. Most of these steels, 11/2 in. thick and up, must be welded using sustained preheat and controlled interpass temperatures, plus controlled welding heat input of approximately 50 to 60 kJ/in. These two items can add as much as 50 percent to the cost of submerged-arc welding, and increases of up to 30 percent are common for manual welding when compared with lower-strength steels previously used. To reduce costs, a quenched and precipitation-hardened steel, ASTM A710 Grade A Class 3, with a high degree of weldability, was tested. This steel, which can be welded without sustained preheat and almost unlimited heat input, has been extensively tested in thicknesses from 21/4 through 6 in. Although this steel costs more than the usual quenched-and-tempered plates at these strength levels, reductions of 40 to 75 percent in welding labor costs are probable. In addition, sizeable material savings should be realized when these items are used in place of HY-80 and HY-100.

Effect of Preheating before Welding on the Microstructure and the Properties of SA213 T12 and SA387Gr11CL2 Steels Joints on the Example of a Sheet Piling

2016 ◽  
Vol 246 ◽  
pp. 201-206
Author(s):  
Kamil Sieczkowski ◽  
Agnieszka Szczotok
Keyword(s):  
Welded Joints ◽  
Arc Welding ◽  
Submerged Arc Welding ◽  
Welding Method ◽  
Heating Up ◽  
Submerged Arc ◽  
Production Conditions

The paper presents the results of the investigations of welded joints of the tube-flat bar type made of SA213 T12 and SA387Gr11CL2 steels. The joints were produced in two variants: 1) with heating up to 200°C, 2) without heating. The materials were joined by the submerged arc welding method. The temperatures of preheating before welding were determined, and it was verified whether the empiric relations (1) and (2), used to determine the minimal temperature of heating before welding for steel, can be applied under production conditions. The produced welded joints were evaluated quality-wise. Hardness measurements were performed in the particular joint areas. Finally, the effect of preheating on the obtained joints was compared.

scholarly journals Multiwire submerged arc welding of steel structures

2012 ◽  
Vol 3 (3) ◽  
pp. 228-233
Author(s):  
R. Dhollander ◽  
S. Vancauwenberghe ◽  
W. De Waele ◽  
N. Van Caenegem ◽  
E. Van Pottelberg
Keyword(s):  
Arc Welding ◽  
Plate Thickness ◽  
Welding Process ◽  
Steel Structures ◽  
Submerged Arc Welding ◽  
Steel Plates ◽  
Bead Geometry ◽  
Weld Bead Geometry ◽  
The Matrix ◽  
Submerged Arc

The assembly of large structures made out of thick steel plates requires a welding process bywhich multiple wires can be used simultaneously. To reproduce these industrial processes in a researchenvironment, OCAS has invested in a multiwire submerged arc welding (SAW) setup. In this multiwiresetup, up to five wires in tandem configuration can be used.The objective of this master thesis is to establish a deeper knowledge of process parameters used to weldsteel plates in a thickness range of 12,7 up to 25 mm, by means of the submerged arc welding process.Based on literature, a test matrix is composed in which the number of wires, the plate thickness and otherweld parameters are the variables. In addition, a specific plate preparation for each plate thickness isderived from the literature. The preformed weld trails will be evaluated on weld bead geometry andmetallographic properties. There is further experimental examination required, which will result in therevising of the matrix.

Railway Vehicle Wheel Restoration by Submerged Arc Welding and Its Characterization

Sci ◽  
2019 ◽  
Vol 1 (1) ◽  
pp. 25
Author(s):  
Byeong-Choo Coo ◽  
Young-Jin Lee
Keyword(s):  
Arc Welding ◽  
Stress Measurement ◽  
Base Material ◽  
Diffraction Method ◽  
Submerged Arc Welding ◽  
Structural Safety ◽  
Railway Vehicle ◽  
Wear Depth ◽  
Minimum Thickness ◽  
Submerged Arc

When a railway vehicle moves on a curved rail, sliding contact occurs between the rail head side and wheel flange, which wears the wheel flange down. The thinned flange needs to be restored above the required minimum thickness for structural safety. In this study, a new process and welding wire for restoring worn-out railway wheels by submerged arc welding was developed. To characterize the properties of the restored wheel, dilatometric analysis of phase transformation, SEM/EDX analyses, hardness measurement, and residual stress measurement using the X-ray diffraction method were performed. Finally, wear tests with full-size wheel/rail specimens were carried out. It was confirmed that the weld metal was composed of bainitic microstructures as intended, and welding defects were not observed. The wear amount of the restored wheel was greater than that of the base material, but it was less than half of the wear depth of the weld-repaired wheel with ferritic–pearlitic microstructures. The developed process seems applicable to industry.

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