An investigation of fusion zone microstructures of welded aluminum alloy joints

Menzemer, Craig C.; Lam, Paul C.; Srivatsan, T. S.; Wittel, C.F

doi:10.1016/s0167-577x(99)00129-9

Cited by 32 publications

(11 citation statements)

References 4 publications

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“…[3][4][5] Usually these studies deal with high strength alloys for the aerospace industry such as the 2xxx or the 7xxx series. 6 Most of the published work on laser welding is dedicated to parameters optimisation, for instance to decrease porosity in the weld, 7 and usually the structure is described in a macroscopic way.…”

Section: Introductionmentioning

confidence: 99%

Microstructure of butt laser joints of aluminium alloy 6056 sheets with an AS12 filler

Fabrègue¹,

Deschamps²,

Suéry³

2005

Materials Science and Technology

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Butt joints of 1?6 mm thick sheets of Al-Mg-Si-Cu alloy 6056 in the T4 temper have been produced using a 3 kW Nd:YAG laser with an Al-12 wt-%Si filler wire. The fusion zone consists of a very fine dendritic structure (DAS55 mm) with a grain size of 100 mm. Its composition is controlled by the ratio between the welding speed and filler wire speed. The interdendritic space is rich in all alloying elements and contains several complex phases. The dendrite interior still contains sufficient solute to enable precipitation hardening during a post-welding heat treatment. The grain boundaries of the base material close to the weld nugget appear to be affected by liquation during the welding process, with spatial extension controlled by the welding speed.The microstructure of the heat affected zone is characterised by GP zone dissolution. The resulting hardness decrease can be fully recovered by a T6 or T78 post-welding heat treatment. The comparatively lower hardness of the fusion zone can also be improved by precipitation hardening during a post-welding heat treatment.

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Section: Introductionmentioning

confidence: 99%

Microstructure of butt laser joints of aluminium alloy 6056 sheets with an AS12 filler

Fabrègue¹,

Deschamps²,

Suéry³

2005

Materials Science and Technology

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“…8(a) and (b). 'Hot short' cracks in different grades of aluminum is generally attributed to residual heat at bottom and excessive heating at toe of the weld [5]. Hot cracking can be reduced by selection of correct filler rod [32] and reduction in the amount of heat input to weld (Fig.…”

Section: Joining Of Different Grades Of Aluminum Alloysmentioning

confidence: 99%

“…Fusion zone microstructure observed under at the bottom of T joint between 5xxx and 6xxx aluminum alloy using 5xxx alloy: (a) bottom recess and (b) toe of the weld[5].…”

mentioning

confidence: 99%

Meeting challenges in welding of aluminum alloys through pulse gas metal arc welding

Praveen

Yarlagadda

2005

Journal of Materials Processing Technology

105

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“…2,3) However, quality of the joints depends on worker's skill, and the removal of the oxide film on the aluminum surface is necessary before welding. 4) Recently, friction stud welding has been applied to overcome these problems in arc stud welding. 2,5) This method is a modified friction welding, and can achieve steady quality of joints because welding only proceeds by prearranged parameters.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Property of 5000 Series Aluminum Stud Joint with Zinc Insert Using Friction Welding

et al. 2011

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Friction stud welding with zinc insert was applied to 5000 series aluminum alloys. A cone-shaped A5056 stud bolt was successfully friction-welded onto A5083 plate at low torque using zinc insert compared to that without zinc insert. This is considered to be contributed by a eutectic reaction between aluminum and zinc, which can effectively remove the oxide film and promote the joining. With bigger torque and longer welding time, the amount of residual zinc was reduced and high strength was achieved. On the other hand, a twist break between the stirred zone and the stud bolt increased during friction and this causes the decrease of tensile strength of the joint after a certain amount of torque. The results of micro-tensile test showed that strength at the edge of joint interface was higher than that at the center area regardless of zinc insert. From the experimental results, the joining process of the present friction stud welding classified into five processes, i.e. wear of stud bolt, start of joining, increase of tensile strength, decrease of tensile strength, and fracture during friction.

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An investigation of fusion zone microstructures of welded aluminum alloy joints

Cited by 32 publications

References 4 publications

Microstructure of butt laser joints of aluminium alloy 6056 sheets with an AS12 filler

Microstructure of butt laser joints of aluminium alloy 6056 sheets with an AS12 filler

Meeting challenges in welding of aluminum alloys through pulse gas metal arc welding

Microstructure and Mechanical Property of 5000 Series Aluminum Stud Joint with Zinc Insert Using Friction Welding

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