Effects of pulse level of Nd-YAG laser on tensile properties and formability of laser weldments in automotive aluminum alloys

Kuo, Tsung-Yuan; Lin, Hsin-Yi

doi:10.1016/j.msea.2005.10.041

Cited by 81 publications

(39 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In terms of weldability for metallic materials, Nd:YAG laser has various advantages, such as a high energy absorption rate due to a low reflectivity, a high welding speed, and a low residual stress compared to CO 2 laser, so the application of Nd:YAG laser to weld metallic materials is steadily being increased, it has been widely implemented in industrial applications, e.g. in the automotive industry [9,10]. But presently, laser power levels are limited for the material thickness involved.…”

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

View full text Add to dashboard Cite

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.

show abstract

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

View full text Add to dashboard Cite

show abstract

“…However they have high hot cracking susceptibility during argon-arc welding and high gas porosity after gas welding [4,5]. Hot cracking susceptibility depends on the value of the effective solidification range (ESR), the strength, and the plasticity in this range [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Effect of Pulse Laser Welding Parameters and Filler Metal on Microstructure and Mechanical Properties of Al-4.7Mg-0.32Mn-0.21Sc-0.1Zr Alloy

Логинова

Khalil

Поздняков

et al. 2017

Metals

View full text Add to dashboard Cite

Abstract:The effect of pulse laser welding parameters and filler metal on microstructure and mechanical properties of the new heat-treatable, wieldable, cryogenic Al-4.7Mg-0.32Mn-0.21Sc-0.1Zr alloy were investigated. The optimum parameters of pulsed laser welding were found. They were 330-340 V in voltage, 0.2-0.25 mm in pulse overlap with 12 ms duration, and 2 mm/s speed and ramp-down pulse shape. Pulsed laser welding without and with Al-5Mg filler metal led to the formation of duplex (columnar and fine grains) as-cast structures with hot cracks and gas porosity as defects in the weld zone. Using Al-5Ti-1B filler metal for welding led to the formation of the fine grain structure with an average grain size of 4 ± 0.2 µm and without any weld defects. The average concentration of Mg is 2.8%; Mn, 0.2%; Zr, 0.1%; Sc, 0.15%; and Ti, 2.1% were formed in the weld. The ultimate tensile strength (UTS) of the welded alloy with AlTiB was 260 MPa, which was equal to the base metal in the as-cast condition. The UTS was increased by 60 MPa after annealing at 370 • C for 6 h that was 85% of UTS of the base alloy.

show abstract

“…There are only few research studies in materials welded by Nd-YAG laser such as, Waspaloy [4], NiTi alloy [5], titanium alloy [6] and automotive aluminium alloys [7], but none of these analyses the fatigue behaviour.…”

Section: Introductionmentioning

confidence: 99%

Mould steels repaired by laser welding

Borrego¹,

Pires

Costa

et al. 2009

Engineering Failure Analysis

View full text Add to dashboard Cite

Laser-deposit welding, by using Nd-YAG, is a mould repairing process, which has the advantages relatively to the traditional methods of achieving a less change of the metal composition around the repaired zone and permitting a very accurate deposition of a small volume of the filler material in the area chosen at the work-piece surface. This paper presents a fatigue study in specimens of two base materials used in mould production (AISI H13 and P20). Filler material as well as welding parameters were analysed in order to obtain better fatigue strength. The tests were carried out under constant amplitude loading, with two stress ratios R = 0 and R = 0.4. Welded specimens were prepared with V notches and filled with laser welding deposits. The fatigue results are presented in the form of S-N curves obtained in welded and non-welded conditions. Complementary measurements of hardness profiles and SEM analysis were carried out to understanding the fatigue behaviour and failure sites. The laser-deposit material was the weaker region in both steels, due to a high level of tensile residual stresses and also to some planar defects that are potential failure sites. Fatigue crack initiation is therefore reduced and the fatigue propagation life is enhanced. A significant mean stress effect in the base material was also observed in both mould steels.

show abstract

Effects of pulse level of Nd-YAG laser on tensile properties and formability of laser weldments in automotive aluminum alloys

Cited by 81 publications

References 15 publications

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

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

Effect of Pulse Laser Welding Parameters and Filler Metal on Microstructure and Mechanical Properties of Al-4.7Mg-0.32Mn-0.21Sc-0.1Zr Alloy

Mould steels repaired by laser welding

Contact Info

Product

Resources

About