Investigation of the Strength and Quality of Aluminium Laser-Mig-Hybrid Welded Joints

Dilthey, Ulrich; Brandenburg, Annica; Reich, F.R.

doi:10.1007/bf03266530

Cited by 10 publications

(3 citation statements)

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“…Both macro-and micro-porosities occur due to the gas compression during the quick solidification of the weld metal. Additionally, Mg vaporization that occurs in the weld metal due to the high heat input during the welding process can lead to the micro-porosity [13,[18][19][20]25]. Caselino et al [23] reported that insufficient penetration could occur in the weld metal due to the fact that Al alloys melt late and solidify quickly during the welding process, as well as micro-void and microporosity defects are likely to occur depending on the presence of hydrogen or Mg loss during the welding process.…”

Section: ]mentioning

confidence: 99%

The effects of welding speed on the microstructure and mechanical properties of marine-grade aluminium (AA5754) alloy welded using MIG welding

Çevik¹,

Koç²

2021

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AA5754 aluminium alloys are commonly used in marine and offshore applications as well as in shipbuilding equipment. It is of great importance to weld this alloy in these industrial areas. This study investigated the penetration, microstructure, and mechanical properties of AA5754 Al alloy sheets that were joined using robotic metal inert gas (MIG) welding at different welding speeds. The joints were welded at three welding speeds by keeping the welding current constant, and then macrostructure and microstructure of the samples taken from these joints were examined. Afterward, their hardness, tensile and bending tests were carried out. It was found that the increase in the welding speed decreased the amount of accumulated metal and the penetration rate. Formation of macro-and micro-porosities was observed in the root sections of the weld seams. It appeared that the welding speed increased, the quantity and size of these defects increased, and the mechanical properties were negatively affected by the increase in the welding speed.

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Section: ]mentioning

confidence: 99%

The effects of welding speed on the microstructure and mechanical properties of marine-grade aluminium (AA5754) alloy welded using MIG welding

Çevik¹,

Koç²

2021

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“…Both arc welding and electron beam welding have been mainly used as conventional welding processes for the aluminum alloys [2][3][4]. During the last two decades, significant and improved solutions for welding aluminum alloys were developed [5][6][7][8]. Although the use of highpower lasers for processing stainless steels and alloy steels has been extensively researched, studies on aluminum alloys are relatively limited.…”

Section: Introductionmentioning

confidence: 99%

Laser Beam Welding of AA5052, AA5083, and AA6061 Aluminum Alloys

El-Batahgy

Kutsuna²

2009

Advances in Materials Science and Engineering

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The present investigation was mainly concerned with characteristics of autogeneous laser butt welding of 2 mm thickness nonheat treatableAA5052-H12,AA5083-H12 and 2 mm, 3 mm thickness heat treatableAA6061-T6aluminum alloys. The effect of laser welding parameters, surface cleaning, filler wire addition, and backing strip on quality of laser welded joints was clarified using 5 kW laser machine. It was found that all the investigated alloys showed tendencies for porosity and solidification cracking, particularly, at high welding speed (4 m/min). Porosity was prevented by accurate cleaning of the base metal prior to welding and optimizing the flow rate of argon shielding gas. Solidification cracking was avoided through two different approaches. The first one is based on the addition of filler metal as reported in other research works. The other new approach is concerned with autogeneous welding using a backing strip from the same base metal, and this could be applicable in production. Preventing solidification cracking in both cases was related mainly to a considerable decrease in the stress concentration at the weld metal center as a result of improving the fusion zone profile. The implementation of the new approach could help in producing weldments with a better quality due to the absence of the filler metal, which is known as a source for hydrogen-related porosity. It can also have a positive economic aspect concerning the manufacturing cost since welding is done without the addition of filler metal. Not only quality and economic positive aspects could be achieved, but also high productivity is another feature since high quality autogeneous weldments were produced with high welding speed, 6 m/min. Hardness measurements and tensile test of AA6061 alloy welds indicated a remarkable softening of the fusion zone due to dissolution of the strengthening precipitates, and this was recovered by aging treatment after welding. For alloys AA5052 and AA5083, softening of the fusion zone due to the loss of its work-hardened condition was much less in comparison with AA6061 alloy.

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“…11,[15][16][17][18] Therefore, systematic research on the control parameters is rare [19][20][21] and it is worth examining this subject more closely. Additionally, imperfect parameter conditions 22 cause defects in the FZ and affect the strength of the weldment markedly. If such a study can be analysed by Taguchi's method, this will not only reduce the cost and time of the research but also allow one to obtain practical results.…”

Section: Introductionmentioning

confidence: 99%

Optimal parameters for low and high voltage electron beam welding of AZ series magnesium alloys and mechanism of weld shape and pore formation

Chi¹,

Chao²,

Liu³

et al. 2008

Science and Technology of Welding and Joining

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The dependence of ultimate tensile strength (UTS) on the parameters of low voltage and high voltage electron beam welding (LV-and HVEBW) has been analyed by changing one factor at a time (COFAAT) and by Taguchi's method for AZ series magnesium alloys. COFAAT is a conventional method for trend analysis of each parameter. However, its cost is high and a long time is needed, and interactions between parameters are ignored. On the other hand, Taguchi's method cannot only reduce the number of experiments, but also provide precise optimum parameters and predicted UTS even when a few data points are lost. According to the results of analysis of variance, the strength of a weldment is affected by oscillation of the beam, the focal position, the welding speed, the accelerating voltage, the beam current and stress relief, in order of impact. The general trend is for the optimum parameters to include a non-oscillating beam, focus at the bottom and no stress relief. With regard to welding speed, accelerating voltage and beam current, there are no specific trends. Finally, the differences in welds between LV-and HVEBW for AZ series forged alloys have been examined to study the mechanism of pore formation, which results from the dissolution of precipitates to reform molecular oxygen. It is also emphasised that the area and shape of the weld cross-section are related to the input power and welding speed.

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Investigation of the Strength and Quality of Aluminium Laser-Mig-Hybrid Welded Joints

Cited by 10 publications

References 0 publications

The effects of welding speed on the microstructure and mechanical properties of marine-grade aluminium (AA5754) alloy welded using MIG welding

The effects of welding speed on the microstructure and mechanical properties of marine-grade aluminium (AA5754) alloy welded using MIG welding

Laser Beam Welding of AA5052, AA5083, and AA6061 Aluminum Alloys

Optimal parameters for low and high voltage electron beam welding of AZ series magnesium alloys and mechanism of weld shape and pore formation

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