A study on influence of shielding gas composition on toughness of flux-cored arc weld of modified 9Cr–1Mo (P91) steel

Arivazhagan, B.; Sundaresan, S.; Kamaraj, M.

doi:10.1016/j.jmatprotec.2009.02.006

Cited by 51 publications

(33 citation statements)

References 7 publications

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“…In order to accurately control the deposition of the welded layers during the welding processes and eliminate the PWHT, TBW is routinely used in the industry [10][11][12][13]. In a typical multi-pass welding process, the crystallographic structure of the first-pass weld is primarily columnar grains [18].…”

Section: Welding Procedures and Joint Characterizationmentioning

confidence: 99%

“…In industry, a practical weld is composed of a large number of overlapping weld layers and beads, and most weld repairs are performed via the TBW technique by the manual metal arc welding (MMAW) process. However, employing flux-cored arc welding (FCAW) can afford better control over the current, voltage, heat input, gas flow rate, stick-out distance, velocity, and wire feeding rate of the weld torch in weld repairs, which are critical factors when performing TBW [10][11][12][13]. FCAW also possesses cost advantages over MMAW due to automation and is regarded to provide a high deposition rate.…”

Section: Introductionmentioning

confidence: 99%

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Effect of welding sequence of a multi-pass temper bead in gas-shielded flux-cored arc welding process: hardness, microstructure, and impact toughness analysis

Ling

Fuh

Kuo³

et al. 2015

Int J Adv Manuf Technol

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Welding is used in ships, military, buildings, industrial machinery, automobiles, and many other industries. Problems associated with welding are common issues encountered in these fields. This paper investigated the weld profile, impact toughness, microhardness, and microstructure of a JIS SS400 structural multi-layer welding joint using gas-shielded fluxcored arc welding (FCAW-G). It further examined the effects of temper bead welding (TBW) made with two different welding processes, namely with 4 Layers 4 Passes (4L4P) and 4 Layers 10 Passes (4L10P). Thermocouples were fixed to measure the thermal cycles, and the temperature distribution curves along the weld seams were measured by infrared radiation (IR) images. All welded samples were checked using nondestructive phased array ultrasonic testing (PAUT) to ensure defect-free samples before the experiments commenced. The Charpy impact tests were finished at 20 and −20°C, respectively. Vickers microhardness measurement was carried out at room temperature. The 4L4P welding process was found to improve the impact toughness of the welding joints. Ferrite (F) and acicular ferrite (AF) were observed via an optical microscope (OM) analysis of the 4L4P welding process, which was more effective in tempering the heat-affected zone (HAZ). In addition, it was found that the 4L4P welding process produced an overall lower hardness than the 4L10P welding process. The microstructure of the welding joints as well as the mechanical properties including impact toughness and microhardness were studied by using a scanning electron microscope (SEM) attached with an energy-dispersive spectrometer (EDS) and an OM.

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Section: Welding Procedures and Joint Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of welding sequence of a multi-pass temper bead in gas-shielded flux-cored arc welding process: hardness, microstructure, and impact toughness analysis

Ling

Fuh

Kuo³

et al. 2015

Int J Adv Manuf Technol

View full text Add to dashboard Cite

show abstract

“…Weight of the specimen after joining (W f ) has been measured by electronic weighing machine. Deposition rate (D) is calculated using (7).…”

Section: A Optimization Of Operating Parametersmentioning

confidence: 99%

“…Arivazhagan et al [7] studied the influence of shielding gas composition on toughness of flux-cored arc weld of modified 9Cr-1Mo (P91) steel. It was found that 95% argon + 5% CO2 is the ideal shielding gas medium for FCAW process to meet the toughness requirements with better process characteristics; Sterjovski et al [8] proposed Artificial Neural Network (ANN) for predicting diffusible hydrogen content and cracking susceptibility in rutile flux-cored arc welds.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Process Parameters for Flux Cored Arc Welding of Boiler Quality Steel Using Response Surface Methodology and Grey-Based Taguchi Methods

Biswas¹,

Pal²,

Bandyopadhyay³

2015

IJMMM

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Abstract-To achieve weld of good quality and high deposition rate, it is essential to know about the influence of the welding parameters on the quality characteristics and deposition rate. It is thereby important to control the parameters accordingly. Process optimization is relevant in this contest. This is true for any welding process including flux cored arc welding (FCAW). In the present study metal plates of boiler quality (BQ) steel have been welded by FCAW at varied levels of input parameters. Input (welding) parameters have been considered in the study are: shielding gas (CO 2 ) flow rate, electrode wire feed rate and arc voltage. In the present work, the use of grey-based Taguchi method for multi-response optimization of the FCAW process in butt welding of BQ steel is reported. Welding has been carried out using a semiautomatic GMAW welding setup on metal plates of BQ steel. Deposition rate has been selected as performance characteristic; hardness and percentage of elongation have been selected as quality characteristics. A regression model for these characteristics has been developed and its adequacy has been evaluated. A two order polynomial equation has been fitted to the data. Response surface methodology (RSM) has been applied to plot the three dimensional response surfaces for deposition rate, hardness and percentage of elongation with FCAW parameters. The importance of the welding parameters in respect of influence of these parameters on the quality index is determined by using analysis of variance (ANOVA).Index Terms-ANOVA, boiler quality steel, FCAW, GMAW, grey-based Taguchi method, regression model, RSM.

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“…Being one of the most significant parameters during the welding treatment, shielding gas protects weld metal from the adverse effects of the nitrogen and oxygen contained in the atmosphere and ensures steady arc and uniform metal transfer. Therefore, type and composition of the gas used considerably affect the microstructure and mechanical characteristics of the joined material [10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Characterization of microstructure, chemical composition, and toughness of a multipass welded joint of austenitic stainless steel AISI316L

Tümer

Yilmaz

2016

Int J Adv Manuf Technol

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In this study, AISI 316 types of austenitic stainless steels were welded by FCAW (flux-cored arc welding) using E316LT1-1/4 flux-cored wire under various shielding gas mixtures containing CO 2 at different ratios. Effects of mixed ratio of Ar and CO 2 in the in the shielding gas on the microstructure, impact toughness, and microhardness of welded materials were studied. Stereo optical microscopy, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), transmission electron microscope (TEM), and TEM/ mapping analysis techniques were used for microstructural characterizations. The impact toughness values of the weldments were decreased as a result of the formation and growth of inclusions in the microstructure due to the increases amount of CO 2 in the shielding gas. The hardness values and δ-ferrite amount in the weld metal were affected by depending on of the shielding gas mixtures.

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A study on influence of shielding gas composition on toughness of flux-cored arc weld of modified 9Cr–1Mo (P91) steel

Cited by 51 publications

References 7 publications

Effect of welding sequence of a multi-pass temper bead in gas-shielded flux-cored arc welding process: hardness, microstructure, and impact toughness analysis

Effect of welding sequence of a multi-pass temper bead in gas-shielded flux-cored arc welding process: hardness, microstructure, and impact toughness analysis

Optimization of Process Parameters for Flux Cored Arc Welding of Boiler Quality Steel Using Response Surface Methodology and Grey-Based Taguchi Methods

Characterization of microstructure, chemical composition, and toughness of a multipass welded joint of austenitic stainless steel AISI316L

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