Fibre laser welding of aluminium alloy

Katayama, Seiji; Nagayama, Hiroyuki; Mizutani, Masami; Kawahito, Yousuke

doi:10.1080/09507110902836911

Cited by 60 publications

(25 citation statements)

References 1 publication

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“…Hydrogen porosity can be effectively reduced by increasing the welding speed so that insufficient time is available for the hydrogen to accumulate because of the rapid cooling and solidification. Using a high-power fibre laser, Katayama et al (2009) investigated penetration and defect formation in several aluminium alloys. They found that 10-mm thick plates of AA5083 were penetrated completely with a power density of 64 MW/cm 2 and that nitrogen gas was more effective than argon at preventing porosity.…”

Section: Weld Porosity and Prevention Methodsmentioning

confidence: 99%

Investigation of weld defects in friction-stir welding and fusion welding of aluminium alloys

Kah

Rajan

Martikainen

et al. 2015

Int J Mech Mater Eng

170

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Transportation industries are obliged to address concerns arising from greater emphasis on energy saving and ecologically sustainable products. Engineers, therefore, have a responsibility to deliver innovative solutions that will support environmental preservation and yet meet industries' requirements for greater productivity and minimised operational costs. Aluminium alloys have successfully contributed to meeting the rising demand for lightweight structures. Notable developments in aluminium welding techniques have resolved many welding related problems, although some issues remain to be addressed. The present study attempts to give an overview of the key factors related to the formation of defects in welding methods commonly used with aluminium alloys. First, a concise overview of defects found in friction-stir welding, laser beam welding and arc welding of aluminium alloys is presented. The review is used as a basis for analysis of the relationship between friction-stir welding process parameters and weld defects. Next, the formation and prevention of the main weld defects in laser beam welding, such as porosity and hot cracking, are discussed. Finally, metallurgical aspects influencing weld metal microstructure and contributing to defects are tabulated, as are defect prevention methods, for the most common flaws in arc welding of aluminium alloys.

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Section: Weld Porosity and Prevention Methodsmentioning

confidence: 99%

Investigation of weld defects in friction-stir welding and fusion welding of aluminium alloys

Kah

Rajan

Martikainen

et al. 2015

Int J Mech Mater Eng

170

View full text Add to dashboard Cite

show abstract

“…However, if the focal point position was too far below the sheet surface, in this case, 95 mm, weld depth and weld width decreased, and the tensile load of the joint decreased. Furthermore, when the focal point position was too far above the sheet surface (105 mm and 110 mm) the diameter of the laser spot was increased and energy density on the surface was decreased [11]. Thus, penetration depth and tensile load decreased.…”

Section: Fig 2 Effect Of Laser Power On Tl Of Jointsmentioning

confidence: 99%

“…Katayama et al [11] investigated the effect of process parameters on the penetration and defect formation of the bead on plate welded AA5083 aluminium alloys. They reported that the weld beads were narrower and deeper with an increase in the power density.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Process Parameters on the Microstructure and Mechanical Performance of Fiber Laser-Welded AA5182 Aluminium Alloys

Yüce¹,

Tutar²,

Karpat³

et al. 2017

SV-JME

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“…After that, AZ31B samples was BOP welded using two different types of shielding gas which were Argon (Ar), and Nitrogen (N 2 ) gas with flow rates of 25 L/min. Previous researcher found that N 2 helps preventing the formation of pores in the WZ in non-ferrous metal compared to using Ar gas despite being use angle of irradiation up to 40̊ inclination [15]. Another motivation using N 2 gas is it was inflammable gas which can reacts with high performance since AZ31B is a flammable metal.…”

Section: Methodsmentioning

confidence: 99%

Effect of fiber laser parameters on laser welded AZ31B Magnesium alloys

Salleh

Ishak

2016

MATEC Web Conf.

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Abstract. Recently, the usage of Magnesium (Mg) alloys has been hugely applied in the industrial application such as in automotive, marine, and electronic due to its advantages of recyclability and lightweight. This alloys required low heat input to be weld since it is easily evaporated due to the Magnesium Oxide (MgO) at the surface and it also possesses lower melting point compared to steel. Laser welding is more convenient to weld Mg alloys due to its high power and lower heat input. AZ31B was selected since it has strong mechanical properties among others Mg alloys due to the major alloying elements; Aluminium (Al) and Zinc (Zn). Low power fiber laser machine with wavelength of 900 nm was used in this experiment. The intention of this work was to investigate the effect of low power fiber laser parameters and effect of shielding gas on weld penetration and microstructure. Another aim in this work was to produce the joint for this thin sheets metal. Penetration depth and microstructure evaluation were emphasized in the analysis section. Bead-on-Plate (BOP) and laser lap welding was conducted on AZ31B with thicknesses of 1.0 mm and 0.6 mm for feasibility study using pulsed wave (PW) mode. Defocusing features was used in order to find better focal position, which has less occurrence of evaporation (underfill). The effect of different angle of irradiation was also investigated. Two types of shielding gases, Argon (Ar) and Nitrogen (N 2 ) were used in order to study the effect of shielding gas. Lastly, the effect of pulsed energy on penetration types and depth of BOP welded samples was investigated. Focus point was found at focal length of 156 mm with 393.75 µm. For BOP experiment, higher pulsed energy used contributes to melt through defect. Meanwhile, N s shielding gas proved to be better shielding gas in laser welding the AZ31B. Higher angle of irradiation could reduce the underfill defect. Fillet Lap joint of similar metal was successfully done where 2.0 J of pulsed energy reveals better weld joint compared to 2.4 J.

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Fibre laser welding of aluminium alloy

Cited by 60 publications

References 1 publication

Investigation of weld defects in friction-stir welding and fusion welding of aluminium alloys

Investigation of weld defects in friction-stir welding and fusion welding of aluminium alloys

The Effect of Process Parameters on the Microstructure and Mechanical Performance of Fiber Laser-Welded AA5182 Aluminium Alloys

Effect of fiber laser parameters on laser welded AZ31B Magnesium alloys

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