Characterisation of dissimilar joints in laser welding of steel–kovar, copper–steel and copper–aluminium

Mai, Tuan-Anh; Spowage, A.C.

doi:10.1016/j.msea.2004.02.025

Cited by 354 publications

(167 citation statements)

References 6 publications

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“…Joining F/A is considered to be a major problem due to the difference in thermal conductivities and thermal expansion, which may lead to crack formation (at the interface) or weld distortion [4,5,6].Recently; laser beam applications in welding has received more attention for joining F/A. Mai, and Spowage, [7] carried out an investigation into laser welding of dissimilar metals without filler materials using Nd:YAG laser. They have studied the mixing behavior of the materials in the fusion zone, the microstructure, the presence of defects, hardness and residual stress of the joints.…”

Section: Introductionmentioning

confidence: 99%

Optimization of tensile strength of ferritic/austenitic laser-welded components

Anawa

Olabi

2008

Optics and Lasers in Engineering

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Ferritic/Austenitic (F/A) joints are a popular dissimilar metals combination used in many applications. F/A joints are usually produced using conventional processes. Laser beam welding (LBW) has recently been successfully used for the production of F/A joints with suitable mechanical properties. In this study, a statistical design of experiment (DOE) was used to optimise selected laser beam welding parameters (laser power, welding speed, and focus length). The Taguchi approach was used for the selected factors, each having five levels (L-25; 5*3). Joint strength was determined using the notched tension strength (NTS) method. The results were analysed using analyses of variance (ANOVA) and the signal-to-noise ratios (S/N) ratio for the optimal parameters, and then compared with the base material. The experimental results indicate that the F/A laser welded joints are improved effectively by optimizing the input parameters using the Taguchi approach.

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Section: Introductionmentioning

confidence: 99%

Optimization of tensile strength of ferritic/austenitic laser-welded components

Anawa

Olabi

2008

Optics and Lasers in Engineering

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“…These include high welding speed, narrow heat-affected zone, low distortion, ease of automation, single-pass thick 0925 section capability and enhanced design flexibility. One of the many features of laser welding is the capability to weld without filler materials (autogenous welding) and it offers distinct advantages [4][5][6][7][8]. Laser welding has recently received growing attention due to its special features and potential.…”

Section: Introductionmentioning

confidence: 99%

Research on laser welding of cast Ni-based superalloy K418 turbo disk and alloy steel 42CrMo shaft

Liu

Guo

et al. 2008

Journal of Alloys and Compounds

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Exploratory experiments of laser welding cast Ni-based superalloy K418 turbo disk and alloy steel 42CrMo shaft were conducted. Microstructure of the welded seam was characterized by optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), energydispersive spectrometer (EDS). Mechanical properties of the welded seam were evaluated by microhardness and tensile strength testing. The corresponding mechanisms were discussed in detail. Results showed that the laser-welded seam had non-equilibrium solidified microstructures consisting of FeCr 0.29 Ni 0.16 C 0.06 austenite solid solution dendrites as the dominant and some fine and dispersed Ni 3 Al ␥ phase and Laves particles as well as little amount of MC short stick or particle-like carbides distributed in the interdendritic regions. The average microhardness of the welded seam was relatively uniform and lower than that of the base metal due to partial dissolution and suppression of the strengthening phase ␥ to some extent. About 88.5% tensile strength of the base metal was achieved in the welded joint because of a non-full penetration welding and the fracture mechanism was a mixture of ductility and brittleness. The existence of some Laves particles in the welded seam also facilitated the initiation and propagation of the microcracks and microvoids and hence, the detrimental effects of the tensile strength of the welded joint. The present results stimulate further investigation on this field.

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“…It is more widely applied to the fields of building, electric-power, and chemical industries [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Interfacial Characterization and Bonding Properties of Copper/Aluminum Clad Sheets Processed by Horizontal Twin-Roll Casting, Multi-Pass Rolling, and Annealing

Mao

Xie

Wang

et al. 2018

Metals

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Abstract:The copper/aluminum (Cu/Al) clad sheets were produced on a horizontal twin-roll caster and then were multi-pass rolled and annealed. The thickness of the as-cast clad sheet was 8 mm. Rolling was performed with total reductions of 12.5%, 25%, 37.5%, 50%, and 62.5%, separately. The effects of the rolling and annealing processes on the interface and peel strength of the Cu/Al clad sheets were investigated. The evolution of the interface and crack propagation were studied. The interface thickness of the as-cast clad sheet reached 9 µm to 10 µm. The average peel strength (APS) was only 9 N/mm. After multi-pass rolling, the peel strength first slightly increased and then gradually decreased with the increase of the rolling pass number. After annealing, the peel strength remarkably improved. The APS reached 25 N/mm when the rolled thickness was 7 mm. The improvement in the peel strength was due to the following three factors: (1) mechanical locking formed in the Cu/Al direct contact region after rolling, (2) the region of the Al matrix fracture, and (3) mechanical biting from the Cu/Al direct contact region.

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Characterisation of dissimilar joints in laser welding of steel–kovar, copper–steel and copper–aluminium

Cited by 354 publications

References 6 publications

Optimization of tensile strength of ferritic/austenitic laser-welded components

Optimization of tensile strength of ferritic/austenitic laser-welded components

Research on laser welding of cast Ni-based superalloy K418 turbo disk and alloy steel 42CrMo shaft

Interfacial Characterization and Bonding Properties of Copper/Aluminum Clad Sheets Processed by Horizontal Twin-Roll Casting, Multi-Pass Rolling, and Annealing

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