Analytical and Numerical Model of Laser Welding Phenomena with the Initial Preheating

Piekarska, W.; Goszczyńska-Króliszewska, Dorota; Domański, Tomasz; Bokota, A.

doi:10.1016/j.proeng.2017.02.206

Cited by 11 publications

(13 citation statements)

References 11 publications

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“…Reduction in the solidification rate can cause the solution in the weld pool to be more evenly distributed, with the solidification latent heat being released fully and the crystal lattices matching better. In general, a method using an external heating source [19] can reduce the solidification rate.…”

Section: Welding Defects For Copper-aluminum Dissimilar Metals and Immentioning

confidence: 99%

Analysis of Laser Micro Welding of Copper-Aluminum Dissimilar Metals and Its Mechanism

Huang¹,

Shi²,

Xie³

et al. 2019

JAMP

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Micro welding of dissimilar metals can meet many performance requirements for modern engineering structures. In this experiment, laser micro welding of copper-aluminum dissimilar metals was conducted with an HWLW-300A energy negative feedback Nd:YAG pulse laser. By using the overlap welding method with copper on aluminum, with the laser energy being distributed unevenly, good weld joints were obtained. In this paper, the welding mechanism was analyzed from aspects such as welding temperature and the specific heat capacity of the solid metal. Existing defects were identified, and a feasible improvement scheme was proposed.and has currently become one of the most important and advanced manufacturing technologies in fields ranging from the aerospace industry to ship building and automobile manufacturing. Through half a century of development, laser micro welding of multiple dissimilar metals has been realized [5] [6] [7].Nevertheless, this does not mean that laser micro welding of all dissimilar metals can be realized. The process of laser micro welding of dissimilar metals relates to multiple physical effects [8], so there are still many difficult problems to solve both experimentally and theoretically. Studying laser micro welding of more dissimilar metals and its mechanism remains a theme explored by researchers.Copper and aluminum metals are widely used in electronics. Partial substitu-J. Huang et al.

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Section: Welding Defects For Copper-aluminum Dissimilar Metals and Immentioning

confidence: 99%

Analysis of Laser Micro Welding of Copper-Aluminum Dissimilar Metals and Its Mechanism

Huang¹,

Shi²,

Xie³

et al. 2019

JAMP

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show abstract

“…The mathematical description is based on solving the following set of equations [5,9,10]: -the equilibrium equations:…”

Section: The Mathematical Model Of Mechanical Phenomenamentioning

confidence: 99%

“…Equation (1) is completed by boundary conditions (displacements), which are assumed to ensure the static determination of considered system [5,7,9,10]:…”

Section: The Mathematical Model Of Mechanical Phenomenamentioning

confidence: 99%

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The effect of restraints type on the generated stresses in gantry crane beam

et al. 2018

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Abstract. This paper includes an analysis of the mechanical phenomena in the gantry crane beam, because the cranes are currently one of the most common devices for the transporting loads. Designing modern mechanical structures is a complex task that requires the use of appropriate tools. Such a modern tool is the numerical simulation, which uses different numerical methods. One of the best known methods is the finite element method, also used here. Simulations are limited to analysis of the strength of the gantry crane beam that was the loaded of the force load movement along its length. The numerical analysis was made to the gantry crane beam which crosssection was an I-beam and ends were fixed in different ways. As the result of numerical calculations, the stresses and displacements of the structure of gantry were obtained. The influence of the restraints type and changing the loading force position on generate the Huber-Misses stress in the gantry crane beam was estimated. The aim was to ensure that the maximum equivalent stress generated in the gantry crane beam was less than the strength of material, because then the construction is safe.

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“…Therefore, the development of laser welding forged steel piston has become one of the development directions of piston structure [14][15][16][17]. Preheating before welding can increase the laser absorption rate of the metal and reduce the cooling rate of the weld, adjust the stress distribution of the welded joint, avoid the generation of hardened structure in the weld, and is one of the welding methods to effectively improve the mechanical properties of the welded joint [18,19].At present, there are more studies on laser welding of aluminum alloy and low carbon steel with preheating, but less on medium carbon steel [20][21][22]. In this paper, the effect of preheating on the weld structure of 42CrMo4/38MnVS6 laser welding is studied, and the mechanical properties of welded joints under different preheating temperature are compared and analyzed, which provides the basis of experimental and theoretical for the application of laser welding technology in a forged steel piston.…”

mentioning

confidence: 99%

Effect of Preheating Temperature on Microstructure and Properties of 42CrMo4/38MnVS6 Heterogeneous Laser Welded Joint

Qiu

Xing

et al. 2019

Metals

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Laser-welded forged steel pistons can meet the needs of the new era of heavy truck engines. 42CrMo4 and 38MnVS6 are widely used as piston materials due to the good mechanical properties. This study investigates the influence of preheating on microstructure and mechanical properties of 42CrMo4/38MnVS6 laser welding joint. The experimental results show preheating increases the laser absorption capacity of the metal, which can lead to an increase in weld width. The microstructure of weld is the high-hardness and poor toughness twin martensite without preheating. As the temperature of preheating increases, the twin martensite in the weld begins to transform into lath martensite and regenerates ferrite and bainite. As the preheating temperature increases, the plane fracture toughness (K1C) of the weld increases and then decreases, reaching the highest value of 2322.94 MPa·mm −1/2 at 150 • C. Compared with no preheating conditions, the tensile strength of the welded joint after preheating is improved. The fracture mode of welded joints changes from brittle fracture to ductile fracture. When the preheating temperature is 100-200 • C, the tensile strength of the welded joint reaches 1018.1-1032.5 MPa; when the preheating temperature is 250 • C-300 • C, the tensile strength decreases. the heat input is in the range of 275 J/mm 0.5 ·s 0.5 to 435 J/mm 0.5 ·s 0.5 , and there was no defect in the weld [12]. Kuryntsev et al. studied the effect of heat treatment on laser welded joints of 0.349C-1Cr-1Si steel. The results showed that the laser welded joint had the characteristics of high hardness and low elongation. After heat treatment, the elongation and ductility of the welded joint are improved [13]. Laser welding has a high energy density, and the base metal is not easy to deform after welding. It can optimize the piston structure and is conducive to the full combustion of fuel. Therefore, the development of laser welding forged steel piston has become one of the development directions of piston structure [14][15][16][17]. Preheating before welding can increase the laser absorption rate of the metal and reduce the cooling rate of the weld, adjust the stress distribution of the welded joint, avoid the generation of hardened structure in the weld, and is one of the welding methods to effectively improve the mechanical properties of the welded joint [18,19].At present, there are more studies on laser welding of aluminum alloy and low carbon steel with preheating, but less on medium carbon steel [20][21][22]. In this paper, the effect of preheating on the weld structure of 42CrMo4/38MnVS6 laser welding is studied, and the mechanical properties of welded joints under different preheating temperature are compared and analyzed, which provides the basis of experimental and theoretical for the application of laser welding technology in a forged steel piston. Materials and Methods Materials

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Analytical and Numerical Model of Laser Welding Phenomena with the Initial Preheating

Cited by 11 publications

References 11 publications

Analysis of Laser Micro Welding of Copper-Aluminum Dissimilar Metals and Its Mechanism

Analysis of Laser Micro Welding of Copper-Aluminum Dissimilar Metals and Its Mechanism

The effect of restraints type on the generated stresses in gantry crane beam

Effect of Preheating Temperature on Microstructure and Properties of 42CrMo4/38MnVS6 Heterogeneous Laser Welded Joint

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