Study of welding velocity and pulse frequency on microstructure and mechanical properties of pulsed gas metal arc welded high strength low alloy steel

Mirzaei, Maryam; Jeshvaghani, R. Arabi; Yazdipour, A.; Zangeneh-Madar, K.

doi:10.1016/j.matdes.2013.04.077

Cited by 39 publications

(18 citation statements)

References 15 publications

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“…Preliminary experiments were conducted to optimize the process parameters based on five factors, five levels CCD. In general, welding speed (V S ) and pulse current parameters have significant effects on heat input, which determines the formation quality of the clad beads [16][17][18][19] . Fig.1 shows the schematic of the pulse current parameters including peak current (I p ), base current (I b ), pulse time (t p ) and base time (t b ).…”

Section: Methodsmentioning

confidence: 99%

Formation Quality Optimization and Corrosion Performance of Inconel 625 Weld Overlay Using Hot Wire Pulsed TIG

Zheng

Shaohu

et al. 2016

Rare Metal Materials and Engineering

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Based on the central composite rotatable design (CCD), clad beads of Inconel 625 were deposited on the surface of AISI 4130 plates using hot wire pulsed TIG (tungsten inert gas arc welding) technique. The response surface methodology (RSM) was used to establish models between process parameters and geometrical characteristics of the clad beads. Then, multiple-track two-layer weld overlay was deposited using the optimized process parameters. The microstructure of the weld overlay is primarily composed of columnar dendrites, and there are also a few planar crystals and cellular dendrites near the fusion zone. Meanwhile, equiaxed grains and steering dendrites are mainly distributed in the upper portion of the weld overlay. Potentiodynamic polarization tests were used to evaluate the corrosion resistance of the weld overlay and the substrate. The results show that adding clad layers can enhance the corrosion resistance, which degrades with the increase in Fe dilution. Moreover, the corrosion resistance of the second layer surface is close to that of wrought Inconel 625.

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Section: Methodsmentioning

confidence: 99%

Formation Quality Optimization and Corrosion Performance of Inconel 625 Weld Overlay Using Hot Wire Pulsed TIG

Zheng

Shaohu

et al. 2016

Rare Metal Materials and Engineering

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“…According to AWS: B4 specifications [26], the tensile test specimens were cut from the 12 mm welded plates in the perpendicular direction to the welding seam. Then, the tensile tests were carried out on a WAW-300B (300 kN, Zhejiang Jingyuan Mechanical Equipment Co., Ltd., Jinhua, China) tensile test machine with a speed of 6 mm/min.…”

Section: Mechanical Testingmentioning

confidence: 99%

Comparative Study of Droplet Transfer Modes on Appearance, Microstructure, and Mechanical Properties of Weld during Pulsed GMAW

Zhai

Xue

Wang

et al. 2020

Metals

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Droplet transfer plays a crucial role in welding stability and quality of pulsed gas metal arc weld (GMAW), referring to the process of heat and mass transition. In this work, the appearance, microstructure, microhardness, tensile properties, and impact toughness with three typical modes of droplet transfer in pulsed GMAW (ODMP: one drop per multiple pulses; ODPP: one drop per pulse; MDPP: multiple drops per pulse) were studied and compared. The results showed that the better welding appearance, the deeper penetration, and the less fume covered on the steel plate could be found during the ODPP welding process. At the same wire feeding speed and arc length, the average current was similar in ODPP and MDPP conditions. However, the average current in the ODMP condition was about 15 A larger than the other two, contributing to the higher heat input. Compared with MDPP and ODMP, the longest elongation and impact energy of the welded joint were found in the ODPP condition. Furthermore, the decrease of elongation and impact toughness in the ODMP condition might result from the higher heat input and the coarsen microstructure, like the proeutectoid ferrite and ferrite side plate.

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“…Applications with mean current above the transition current are also found today, especially in modern versions of GMAW, benefiting from arc stability and seam formation provided by the pulse mode [8]. The main benefits of the GMAW-P process are significant reduction of thermal input when compared to spray transfer and increase in the deposition rate through the adequate selection of pulse and base parameters [8,9]. Moreover, it influences cooling rate, metal solidification behavior, and temperature gradients in the heat-affected zone (HAZ), so to improve the mechanical properties of the welded area [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…The main benefits of the GMAW-P process are significant reduction of thermal input when compared to spray transfer and increase in the deposition rate through the adequate selection of pulse and base parameters [8,9]. Moreover, it influences cooling rate, metal solidification behavior, and temperature gradients in the heat-affected zone (HAZ), so to improve the mechanical properties of the welded area [9,10]. However, to ensure such benefits, the GMAW-P process highly depends on the chemical composition of the filler metal, as well as the composition of gas mixture applied as shielding gas [11,12].…”

Section: Introductionmentioning

confidence: 99%

Effect of wire electrode and shielding gas compositions on the mechanical properties of DOMEX 700 steel welded by the GMAW-P process

Haupt

Riffel

Israel

et al. 2018

J Braz. Soc. Mech. Sci. Eng.

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High-strength steels such as DOMEX 700 combine high mechanical strength and great ductility. However, when processed by welding their microstructure could present grain growth and deleterious phase formation. Nevertheless, using highpower GMAW-P the effects of electrode and shielding gas composition on the mechanical and microstructure properties of DOMEX 700 welded joints need to be understood. Thus, wire electrodes such as AWS ER 90S-D2 (A1) and AWS ER 120S-G (A2), and shielding gases such as Ar ? 15% CO 2 (G1) and Ar ? 8% CO 2 (G2) were used and the microstructure of welded joints was analyzed through optical and scanning electron microscope (SEM). Mechanical properties of joints was characterized through joint tensile test, impact test from 20 to-40°C, and microhardness in the joint cross-sectional. It is possible to highlight the increase in strength and elongation values with the use of electrode A2, and reduction in impact energy values for specimens welded by gas mixture G2.

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Study of welding velocity and pulse frequency on microstructure and mechanical properties of pulsed gas metal arc welded high strength low alloy steel

Cited by 39 publications

References 15 publications

Formation Quality Optimization and Corrosion Performance of Inconel 625 Weld Overlay Using Hot Wire Pulsed TIG

Formation Quality Optimization and Corrosion Performance of Inconel 625 Weld Overlay Using Hot Wire Pulsed TIG

Comparative Study of Droplet Transfer Modes on Appearance, Microstructure, and Mechanical Properties of Weld during Pulsed GMAW

Effect of wire electrode and shielding gas compositions on the mechanical properties of DOMEX 700 steel welded by the GMAW-P process

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