Effects of Pulsed Nd:YAG Laser Welding Parameters on Penetration and Microstructure Characterization of a DP1000 Steel Butt Joint

Xue, Xin; Péreira, A.; Amorim, José; Liao, Juan

doi:10.3390/met7080292

Cited by 44 publications

(27 citation statements)

References 33 publications

(36 reference statements)

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“…Increasing overlap percentage provides a penetration closer to the maximum penetration. The dependence between pulse frequency, spot diameter, welding speed and overlap coefficient is presented in Equation 10 [48]:…”

Section: The Methodology Of Calculation Of Laser Welding Regimesmentioning

confidence: 99%

Laser welding of copper‐niobium microcomposite wires for pulsed power applications

Višniakov

Mikalauskas

Černašėjus

et al. 2019

Materialwissenschaft Werkst

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The laser welding of copper‐niobium microcomposite wires was investigated. It was determined that the joint structure does not have welding defects, while microscopic examination of the joint cross‐section showed that the microstructure of the autogenous weld consists mainly of a copper‐based solid solution strengthened by niobium‐rich precipitations. The weld obtained with use of filler material consists of two distinct zones, which are formed due to melting of filler wire and microcomposite wire. This structure of the joint provides an insignificant increase in electrical resistance and sufficient ultimate strength and plasticity of the joint. The tensile strength of the sample welded without filler material reaches 335 MPa, but such welded joints are very brittle due to very low ductility. However, an autogenous laser welding joint has about 1.6 times better ductility, and the tensile strength of the joint depends on the applied filler material and is equal to the tensile strength of this material.

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Section: The Methodology Of Calculation Of Laser Welding Regimesmentioning

confidence: 99%

Laser welding of copper‐niobium microcomposite wires for pulsed power applications

Višniakov

Mikalauskas

Černašėjus

et al. 2019

Materialwissenschaft Werkst

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“…Arc welding processes such as gas metal arc welding (GMAW) are also used for auto body structures that are plastically deformed or closed parts or where the part geometry inhibits the use of RSW . LW of DP steels have been extensively studied during the last decade . The main outcome of these studies was that fusion zone hardening and heat affected zone (HAZ) softening occurred during the LW of DP steels, which resulted in deterioration of the tensile and fatigue properties as well as the formability of the laser welded DP steel joints .…”

Section: Introductionmentioning

confidence: 99%

Comparison of Microstructure and Tensile Properties of Dual Phase Steel Welded Using Friction Stir Welding and Gas Tungsten Arc Welding

Ashrafi

Shamanian

Emadi

et al. 2018

steel research int.

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In the present research, a comparative study on influence of friction stir welding (FSW) and gas tungsten arc welding (GTAW) processes on the microstructure and tensile properties of dual phase steel welds is carried out. The results indicate that the microstructure of weld metal and inner part of the heat affected zone (HAZ) in the GTA welded sample is composed of coarse bainite, Widmanestatten ferrite and ferrite–carbide (FC) aggregate. The sample welded by FSW exhibits the formation of fine ferrite, FC aggregate, and bainite in the weld nugget and inner part of the HAZ. Microhardness measurements reveal the formation of a softened zone in the subcritical area of the HAZ due to the tempering of the pre‐existing martensite. Both joints show lower tensile strength, tensile elongation and work hardening exponent compared to the base metal (BM), and fail in the softened HAZ during the uniaxial tensile test. However, the joint efficiency, work hardening rate and work hardening exponent of the sample welded by FSW are superior to those for the GTA welded sample. The predominant fracture mechanism for all samples is ductile with dimples on the fractured surfaces.

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“…The sample surface was kept above or below the beam focus at a distance of 2.5 mm. After establishing the full weld penetration, further process parameters could be tuned in order to improve the weld quality [24]. Pulse duration was varied between 1 and 6 ms.…”

Section: Methodsmentioning

confidence: 99%

Control of Porosity and Spatter in Laser Welding of Thick AlMg5 Parts Using High-Speed Imaging and Optical Microscopy

Popescu

Delval

Leparoux

2017

Metals

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Abstract:We report on a feedback mechanism for rapid identification of optimal laser parameters during welding of AlMg5 coupons using real-time monitoring by high-speed imaging. The purpose was to constrain the liquid movement in the groove in order to obtain pore-free welds in this otherwise difficult-to-weld alloy. High-speed imaging of the welding process via an optical microscope allowed for recording at millimeter level, providing new information on liquid-metal dynamics during laser irradiation as well as plausible explanations for spatter occurrence and pores formation. The pore formation and especially the position of these pores had to be controlled in order to weld 3 mm thick samples. By tuning both laser power and pulse duration, pores were aligned on a single line, at the bottom of the weld. A laser pass of reduced power on that side was then sufficient for removing all pores and providing a suitable weld.

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Effects of Pulsed Nd:YAG Laser Welding Parameters on Penetration and Microstructure Characterization of a DP1000 Steel Butt Joint

Cited by 44 publications

References 33 publications

Laser welding of copper‐niobium microcomposite wires for pulsed power applications

Laser welding of copper‐niobium microcomposite wires for pulsed power applications

Comparison of Microstructure and Tensile Properties of Dual Phase Steel Welded Using Friction Stir Welding and Gas Tungsten Arc Welding

Control of Porosity and Spatter in Laser Welding of Thick AlMg5 Parts Using High-Speed Imaging and Optical Microscopy

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