scholarly journals EFFECT OF WELDING POSITION ON THE MECHANICAL PERFORMANCE OF MANUAL METAL ARC WELDELD JOINTS VIA ANALYSIS OF VARIANCE

2020 ◽  
Vol 4 (6) ◽  
Author(s):  
Rui Rosa de Morais Júnior ◽  
Marcelo Xavier Guterres ◽  
Alexandre Ferreira Galio ◽  
Henara Lillian Costa
Keyword(s):  
Mechanical Properties ◽  
Analysis Of Variance ◽  
Welded Joints ◽  
Arc Welding ◽  
Mechanical Performance ◽  
Tensile Tests ◽  
Total Displacement ◽  
Metal Arc Welding ◽  
Plastic Displacement ◽  
Welding Position

Positional welding is a common challenge in many manufacturing practices and the welding position can affect the mechanical properties of welded joints during manual metal arc welding. This work uses tensile tests to investigate the mechanical properties of welded joints, aiming to test the hypothesis of the influence of welding position on tensile strength, total displacement before rupture and plastic displacement before rupture. This hypothesis was tested for three different coated electrodes (AWS E6010, AWS E6013 and AWS E7018) and three welding positions (1G, 3G and 4G), accounting for nine types of specimens. For each type of specimen, ten repetitions were carried out. Analysis of Variance (ANOVA) was used to test the hypotheses. The welded joints using the welding position 1G presented higher rupture load and larger total displacement before rupture than the other positions.

Microstructure and Mechanical Properties of Welded Joints of Cr18Ni30Mo2Al3Nb Alloy

2014 ◽  
Vol 636 ◽  
pp. 89-92
Author(s):  
Rui Luo ◽  
Xiao Nong Cheng ◽  
Gui Fang Xu ◽  
Dong Sheng Li ◽  
Shun Guo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Welded Joints ◽  
Arc Welding ◽  
Comparative Research ◽  
Mechanical Performance ◽  
Tensile Fracture ◽  
Welding Parameters ◽  
Butt Joints ◽  
Argon Flow ◽  
Scaning Electron Microscopy

In this present study, A comparative research on the mechanical properties of the dissimilar welded joints of 800H and Cr18Ni30Mo2Al3Nb was investigated. Butt joints were made using argon tungsten-arc welding (TIG). The TIG joint was made using well established welding parameters (i.e., current ampere of 110~120A, welding rate of 105~115mm/min, argon flow 8~10L/min and voltage of 12V). Mechanical behavior of joints was evaluated by room temperature and high temperature (650°C) tensile testing, and hardness testing, respectively. The microstructure of joint was characterized via optical microscopy, and the morphology of tensile fracture was observed by scaning electron microscopy. As can be seen from the experimental results, clearly shown that Cr18Ni30Mo2Al3Nb has better mechanical performance of welded joint than 800H.

Effect of Different Heat Treatments on Microstructure and Mechanical Properties of Steel Containing Ni of 9% Base and Weld Metals

2013 ◽  
Vol 275-277 ◽  
pp. 2148-2155
Author(s):  
Min Zhang ◽  
Qiao Ling Chu ◽  
Ji Hong Li
Keyword(s):  
Mechanical Properties ◽  
Comparative Study ◽  
Arc Welding ◽  
Tensile Tests ◽  
Heat Treatments ◽  
Shielded Metal Arc Welding ◽  
Weld Metals ◽  
Microstructure And Mechanical Properties ◽  
Metal Arc Welding ◽  
Quenching And Tempering

An comparative study was made of microstructure and mechanical properties of steel constaining Ni of 9% in different heat treatments. Shielded metal arc welding (SMAW) was employed as jointing technique. Double normalizing and tempering (NNT) and quenching, intercritical quenching and tempering (QLT) were applied as the heat treatments. Instrumented impact and tensile tests were performed between 20°C and 196°C. The results show that both the microstructure and mechanical properties of base and weld metals in QLT solution turn out to be the optimal.

Effects of Welding Positions on Mechanical Properties and Microstructure in Weld Metal of High Strength Steel

2009 ◽  
Vol 83-86 ◽  
pp. 1121-1127 ◽  
Author(s):  
F. Masoumi ◽  
D. Shahriari
Keyword(s):  
Mechanical Properties ◽  
Weld Metal ◽  
Arc Welding ◽  
High Strength ◽  
Vertical Position ◽  
Shielded Metal Arc Welding ◽  
Tensile Impact ◽  
Metal Arc Welding ◽  
Welding Metal ◽  
Welding Position

In this study the effects of two welding positions included in flat and upward vertical on the mechanical properties and microstructure of high strength weld metal deposited with shielded metal arc welding (SMAW) using an electrode of ASME SFA 5.5-96 E9018B3 type have been investigated. The aim of the present work is to study the effects of these two welding positions for a weld metal alloyed with 1%Mo, 2%Cr, 0.79%Mn, and 0.08% C in the stress relieved condition. For studying mechanical properties Tensile, Impact and hardness experiments have been conducted; meanwhile chemical analysis and microstructure studying have been carried out on specimens. The results show that welding position does not have any significant effect on tensile and hardness of the weld metal but in vertical position welding metal toughness is lower than toughness in flat position in all temperatures. Transition temperature of ductile fracture to brittle fracture is -50 °C for E9018B3 in welding of high strength micro alloyed steels.

scholarly journals Gas Metal Arc Welding of Thermo-Mechanically Controlled Processed S960MC Steel Thin Sheets with Different Welding Parameters

2018 ◽  
Vol 20 (4) ◽  
pp. 29-35 ◽  
Author(s):  
Michal Jambor ◽  
Frantisek Novy ◽  
Milos Mician ◽  
Libor Trsko ◽  
Otakar Bokuvka ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Arc Welding ◽  
Welded Joint ◽  
Gas Metal Arc Welding ◽  
Tensile Tests ◽  
Welding Parameters ◽  
Thin Sheets ◽  
Micro Hardness ◽  
Fine Grain ◽  
Metal Arc Welding

In this paper are presented results of mechanical properties evaluation of the thin sheets welds made of the S960MC TMCP steel, which were executed using the GMAW procedure with different process parameters. The microstructural changes in the heat affected zone (HAZ) were evaluated, as well. The microstructural observation revealed significant changes in the HAZ and the three main zones, coarse grain, fine grain and intercritical (CGHAZ, FGHAZ and ICHAZ) were identified in the HAZ for both sets of tested welding parameters. Evaluation of the micro-hardness showed significant reduction of the micro-hardness in the ICHAZ, for both tested states, and the ICHAZ was identified as the most critical area of the whole welded joint. Results of the tensile tests revealed significant reduction of mechanical properties regardless of the welding parameters.

scholarly journals Mechanical and metallurgical properties of DP 1000 steel square butt welded joints with GMAW

2014 ◽  
Vol 4 (1) ◽  
pp. 26 ◽  
Author(s):  
Ianto Rocha ◽  
Ivan Machado ◽  
Cintia Mazzaferro
Keyword(s):  
Mechanical Properties ◽  
Yield Strength ◽  
Welded Joints ◽  
Heat Input ◽  
Arc Welding ◽  
Gas Metal Arc Welding ◽  
Metallurgical Properties ◽  
Metal Arc Welding ◽  
Filler Metals ◽  
Minimum Heat

In this work, Gas Metal Arc Welding (GMAW) was used to study the influence of heat input (i.e. cooling rate) on mechanical/metallurgical properties of square butt welded joints of DP 1000 sheets. The influence of filler metals of different strengths on the mechanical properties of joints was also tested. A significant decrease in hardness was observed in the Heat Affected Zone (HAZ) due to martensite tempering, in regions where peak temperature was close to isotherm AC1 (calculated in 735 oC for these steel); coincidently, fracture in every tensile test occurred in regions where martensite was tempered, even when a wire of less strength was used. It was noticed that the decrease in ultimate tensile and yield strength of base metal was inherent to welding. When minimum heat input was used, deterioration in mechanical properties was less pronounced, once degree of HAZ softening was smaller. Elongation of joints increased with increasing heat input.

scholarly journals The influence of manual metal arc multiple repair welding of long operated waterwall on the structure and hardness of the heat affected zone of welded joints

2017 ◽  
Vol 62 (1) ◽  
pp. 327-333 ◽  
Author(s):  
J. Pikuła ◽  
M. Łomozik ◽  
T. Pfeifer
Keyword(s):  
Heat Affected Zone ◽  
Welded Joints ◽  
Arc Welding ◽  
Power Plants ◽  
Welded Joint ◽  
Weld Bead ◽  
Boiler Steel ◽  
Metallographic Examination ◽  
Metal Arc Welding ◽  
High Degree

Abstract Welded installations failures of power plants, which are often result from a high degree of wear, requires suitable repairs. In the case of cracks formed in the weld bead of waterwall, weld bead is removed and new welded joint is prepared. However, it is associated with consecutive thermal cycles, which affect properties of heat affected zone of welded joint. This study presents the influence of multiple manual metal arc welding associated with repair activities of long operated waterwall of boiler steel on properties of repair welded joints. The work contains the results of macro and microscopic metallographic examination as well as the results of hardness measurements.

Gas metal arc welding of XPF800 steel for automotive industry: Microstructural evaluation and mechanical properties investigation

2021 ◽  
pp. 146442072110567
Author(s):  
Emre Korkmaz ◽  
Cemal Meran
Keyword(s):  
Mechanical Properties ◽  
Base Metal ◽  
Automotive Industry ◽  
Heat Affected Zone ◽  
Arc Welding ◽  
Gas Metal Arc Welding ◽  
Charpy Impact ◽  
Optical Microscope ◽  
Metal Arc Welding ◽  
Heat Affected Zone Softening

In this study, the effect of gas metal arc welding on the mechanical and microstructure properties of hot-rolled XPF800 steel newly produced by TATA Steel has been investigated. This steel finds its role in the automotive industry as chassis and seating applications. The microstructure transformation during gas metal arc welding has been analyzed using scanning electron microscope, optical microscope, and energy dispersive X-ray spectrometry. Tensile, Charpy impact, and microhardness tests have been implemented to determine the mechanical properties of welded samples. Acceptable welded joints have been obtained using heat input in the range of 0.28–0.46 kJ/mm. It has been found that the base metal hardness of the welded sample is 320 HV0.1. On account of the heat-affected zone softening, the intercritical heat-affected zone hardness values have diminished ∼20% compared to base metal.

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