The Weld Toe Improvement of Advanced HSLA Steel by Laser Remelting

The Friction stir welding (FSW) is a complex process, depending on many factors: machine, clamping device, material and tools. Parameters that have a direct impact on the quality of the joint include the rotational speed, welding speed, clamping force, geometry and tool plunging depth. The paper presents the results of experimental studies concerning the effect of tool pin length on the microstructure and mechanical strength of joints of thin sheets made of Al 7075 alloy. A tool with an adjustable pin with concave shoulder was used to weld the joints. Different pin lengths were used, which were selected with respect to the thickness of the welded joint. The specimens were subjected to visual evaluation, metallographic tests and mechanical strength testing. The results indicate that the pin length has a decisive effect on the microstructural changes in the joint and thus influencing the strength of the FSW joints.

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“…case of the MIG, TIG and plasma welding, good joint quality depends on cca. 13, 15 and 24 parameters, respectively [11][12][13].…”

Section: Effect Of Tool Pin Length On Microstructure and Mechanical Strength Of The Fsw Joints Of Al 7075 Metal Sheetsmentioning

confidence: 99%

Effect of Tool Pin Length on Microstructure and Mechanical Strength of the FSW Joints of Al 7075 Metal Sheets

Wrońska¹,

Andres²,

Altamer³

et al. 2019

Komunikácie

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“…When the laser beam, of the above parameters, impacts the material being cut it causes the material's rapid heating up. Within milliseconds, the material is heated up to the melting or the evaporation temperature [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Comparison of the PMMA mechanical properties after cutting by the laser beam and milling

Nigrovič¹,

Meško²,

Nikolić³

et al. 2018

FME Transaction

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“…The remelting process also allows for changing the chemical composition of a surface layer, which is used in alloying cladding. Combined methods are also used, for example, in a thermochemical treatment in a fluidized bed and further laser treatment [7,8]. Laser technologies associated with remelting require a higher density of radiation power (10 4 -10 10 W / cm 2 ) than the modification of a surface layer without remelting and the time of interaction of the beam with the material of 10 -1 -10 -9 s. High power lasers Nd: YAG and CO 2 with a continuous and pulse operation are mainly used [6].…”

Section: Introductionmentioning

confidence: 99%

Impact of Laser Machining on the Structure and Properties of Tool Steels

2018

Materials Research Proceedings

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The Weld Toe Improvement of Advanced HSLA Steel by Laser Remelting

Cited by 5 publications

References 4 publications

Effect of Tool Pin Length on Microstructure and Mechanical Strength of the FSW Joints of Al 7075 Metal Sheets

Effect of Tool Pin Length on Microstructure and Mechanical Strength of the FSW Joints of Al 7075 Metal Sheets

Comparison of the PMMA mechanical properties after cutting by the laser beam and milling

Impact of Laser Machining on the Structure and Properties of Tool Steels

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