Fatigue crack fusion in thin-sheet aluminum alloys AA7075-T6 using low-speed fiber laser welding

Tu, Jay F.; Paleocrassas, A. G.

doi:10.1016/j.jmatprotec.2010.09.001

Cited by 41 publications

(19 citation statements)

References 31 publications

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“…CO 2 lasers generally have an efficiency of 20 %, with a very good beam quality, high precision and high welding speed (Chang et al 2010). High surface reflectivity, high thermal conductivity and volatilisation of low boiling point constituents make LBW of aluminium quite difficult (Tu and Paleocrassas 2011). In addition, very accurate preparations of parts are required as no gap or in some cases only a minimal gap is permissible during alignment of the parts.…”

Section: Characteristics Of Laser Beam Weldingmentioning

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: Characteristics Of Laser Beam Weldingmentioning

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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“…[25][26][27] The microstructure of the BM has revealed grains elongated along rolling direction as it is shown in Fig. 1a.…”

Section: Materials and Microstructurementioning

confidence: 89%

“…Additionally, it could be concluded that CMT process achieved mechanical characteristics comparable to FSW and LBW since these processes use low heat input as well. 25,35,[39][40][41][42][43][44] We should mention here the advantages of CMT in comparison with other welding processes with respect to its higher welding speeds, simplicity and easy automation, low skill required for operation, availability, cost and economic issue. When the joints are loaded in tension, the WM constitutes the weakest area where all the strain concentrates.…”

Section: Tensile Propertiesmentioning

confidence: 99%

Effectiveness of cold metal transfer process for welding 7075 aluminium alloys

Elrefaey

2015

Science and Technology of Welding and Joining

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Cold metal transfer (CMT) welding is a promising process to improve the mechanical characteristics of the hard to weld 7075-T6 aluminium alloy owing to its unique advantages in contrast to conventional metal inert gas welding process. The welded joints, using ER5356, were identified and characterised by means of optical microscopy, scanning electron microscopy and energy dispersive spectroscopy. Mechanical properties were measured by tensile and hardness tests. Results indicate that CMT provides better joint tensile strength and ductility compared to metal inert gas welding. The softness in the heat affected zone was very low, but a big hardness gap was recognised in the welded metal compared to base metal. The joint had mechanical property coefficients of 77%, 60% and 69% for yield strength, ultimate tensile strength and elongation respectively.

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“…Ebbe az osztályba a 400-700 nm hullámhossztartományban működő lézerek tartoznak és a rövididejű (t < 0,25 s) besugárzás esetén az emberi szemre nem veszélyesek, kivéve, ha a sugárzás a keresztmetszetét csökkentő optikai eszközből érkezik. Ekkora sugárzási szintek még a fénytávközlésben is előfordulnak [4,5].…”

Section: R Osztályú Lézerberendezésunclassified