On the weldability, composition, and hardness of pulsed and continuous Nd:YAG laser welds in aluminum alloys 6061,5456, and 5086

Cieslak, M.J.; Fuerschbach, P.W.

doi:10.1007/bf02654217

Cited by 120 publications

(60 citation statements)

References 4 publications

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“…Solidification cracking had been observed in SLS/SLM fabricated parts made in several alloyed metallic parts [169]; however, it is scarcely observed in aluminium alloy parts processed with CW Nd:YAG laser systems while the contrary is true for PW Nd:YAG laser systems [30,170]. Moreover, heat treatable 2000 and 6000 series alloys are known to be more susceptible to solidification cracking than work hardening 5000 alloys during laser processing [4,165,171,172].…”

mentioning

confidence: 99%

A review on selective laser sintering/melting (SLS/SLM) of aluminium alloy powders: Processing, microstructure, and properties

Olakanmi

Mullis

Dalgarno

2015

Progress in Materials Science

1,436

526

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mentioning

confidence: 99%

A review on selective laser sintering/melting (SLS/SLM) of aluminium alloy powders: Processing, microstructure, and properties

Olakanmi

Mullis

Dalgarno

2015

Progress in Materials Science

1,436

526

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“…Figure 11 also shows that the value of ÁF has no obvious effect on the amount of magnesium in the weld metal because the welding speeds in the ÁF H and ÁF L specimens are approach. Previous studies 11,32,33) showed that magnesium loss reduces the hardening quality of the solid solution, with the result that both the tensile strength and the ductility decrease. 3.2.3 Effects of weld bead geometry, welding speed and magnesium content on hot cracking Figure 9 shows the presence of hot cracking in the roots of the ÁF L welds.…”

Section: Effects Of áF and áP On Evaporative Loss Of Magnesiummentioning

confidence: 99%

“…Cieslak and Fuerschbach 11) reported that the probability of hot cracking in aluminum alloys under PW laser welding is higher than that under CW laser welding. However, they also stated that hot cracking can be prevented, even under PW laser welding, by carrying out welding with appropriate laser operating conditions.…”

Section: Effects Of áF and áP On Evaporative Loss Of Magnesiummentioning

confidence: 99%

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Effects of Shielding Gas Flow Rate and Power Waveform on Nd:YAG Laser Welding of A5754-O Aluminum Alloy

Kuo

Lin

2006

Mater. Trans.

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Although the microstructure, hot crack susceptibility and porosity of aluminum alloy laser welds are affected by many welding parameters, the effects of the shielding gas flow rate and the power waveform are particularly significant. In this study, a high-power Nd:YAG laser is used to weld A5754-O aluminum alloy sheets of 1 mm in thickness. Initially, bead-on-plate (BOP) welding is performed using a rectangular waveform with a constant mean output power and three different levels of ÁP (ÁP ¼ P p À P b , where P p is the peak power and P b is the base power). Butt welding is then performed using the appropriate BOP welding speed, which is lower than the welding speed for just full penetration, and one of two levels of ÁF (ÁF ¼ F f À F b , where F f is the face shielding gas flow rate and F b is the back shielding gas flow rate). The BOP welding results show that reducing the value of ÁP increases the welding speed required for full-penetration, and therefore increases the penetration depth to bead width ratio and the micro-hardness of the weld bead. The butt welding results show that the tensile strength and total elongation properties of the high ÁF (ÁF H ) specimens are approximately three times higher than those of the low ÁF (ÁF L ) specimens. This is primarily due to the absence of hot cracking in the ÁF H specimens, together with a finer microstructure and a lower level of porosity. This study demonstrates that the effect of ÁF on the weld bead geometry, microstructure, hot crack susceptibility and mechanical properties is far higher than that of ÁP. However, the effect of ÁP on the change of welding speed is higher than that of ÁF.

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“…[12][13][14] As a welding application for aluminum alloy, the effect of aluminum alloy number on the weldability of Nd:YAG laser welding has been studied. 15) The purpose of this author's work is to correctly identify the alloy number of aluminum ally samples by laser irradiation using the Nd:YAG laser. This is a basic study for developing the automated sorting system of aluminum scraps to establish the recycling system of wrought aluminum to wrought materials.…”

Section: )mentioning

confidence: 99%

Application of Nd:YAG Laser to Aluminum Alloy Sorting

et al. 2005

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It is important to develop an effective sorting system of aluminum to reduce the cascade recycling of aluminum scraps by instead returning the scraps to wrought aluminum. A feasibility study has been conducted to develop a new sorting process of aluminum scraps. In this study, irradiation of an aluminum surface by pulsed Nd:YAG laser and an automatic sorting method by a pattern-matching method were tested to identify the alloy number of aluminum scraps. For sorting test samples, seven aluminum alloys (1050, 2024, 3003, 4343, 5052, 6063, 7075) were selected from seven wrought aluminum alloy series. The surface of the aluminum irradiated and melted by a YAG laser beam. The surface morphology, including the molten area, brightness profile and change in color, was observed after irradiation. There was a difference in the surface morphology among the aluminum alloys after irradiation. The effect of laser irradiation conditions such as the defocus distance, input energy and laser irradiation angle on the surface morphology after irradiation was investigated to establish the appropriate conditions of laser irradiation for sorting aluminum alloys. It was clear that the surface morphology of aluminum seems to depend on physical properties such as thermal conductivity and liquidus temperature. Therefore, it seems possible to establish an automated aluminum sorting method by using the pattern matching method on irradiated aluminum samples.

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On the weldability, composition, and hardness of pulsed and continuous Nd:YAG laser welds in aluminum alloys 6061,5456, and 5086

Cited by 120 publications

References 4 publications

A review on selective laser sintering/melting (SLS/SLM) of aluminium alloy powders: Processing, microstructure, and properties

A review on selective laser sintering/melting (SLS/SLM) of aluminium alloy powders: Processing, microstructure, and properties

Effects of Shielding Gas Flow Rate and Power Waveform on Nd:YAG Laser Welding of A5754-O Aluminum Alloy

Application of Nd:YAG Laser to Aluminum Alloy Sorting

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