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Heat-affected zone

About: Heat-affected zone is a research topic. Over the lifetime, 18787 publications have been published within this topic receiving 231744 citations.


Papers
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Journal ArticleDOI
TL;DR: In this paper, a keyhole closure process in high-strength AlZnMg(Cu) alloys, refill friction stir spot welding was used to perform repair welds of through holes of 7.5mm diameter in AA 7075-T651 plates with 6mm thickness.

85 citations

Journal ArticleDOI
TL;DR: In this article, a 3D model for heat and fluid flow in a moving GMA weld pool is presented, which takes the mass, momentum, and heat transfer of filler metal droplets into consideration and quantitatively analyzes their effects on the weld bead shape and weld pool geometry.
Abstract: Mathematical models capable of accurate prediction of the weld bead and weld pool geometry in gas metal arc (GMA) welding processes would be valuable for rapid development of welding procedures and empirical equations for control algorithms in automated welding applications. This article introduces a three-dimensional (3-D) model for heat and fluid flow in a moving GMA weld pool. The model takes the mass, momentum, and heat transfer of filler metal droplets into consideration and quantitatively analyzes their effects on the weld bead shape and weld pool geometry. The algorithm for calculating the weld reinforcement and weld pool surface deformation has been proved to be effective. Difficulties associated with the irregular shape of the weld bead and weld pool surface have been successfully overcome by adopting a boundary-fitted nonorthogonal coordinate system. It is found that the size and profile of the weld pool are strongly influenced by the volume of molten wire, impact of droplets, and heat content of droplets. Good agreement is demonstrated between predicted weld dimensions and experimently measured ones for bead-on-plate GMA welds on mild steel plate.

85 citations

Journal ArticleDOI
Hong Ma1, Guoliang Qin1, Peihao Geng1, Fei Li1, Banglong Fu1, Xiangmeng Meng1 
TL;DR: In this article, the microstructure variation and mechanical properties of carbon steel and 304 stainless steel are studied in detail, and the weld interface can be clearly identified in central zone, while the two metals interlock with each other by the mechanical mixing in peripheral zone.

85 citations

Journal ArticleDOI
TL;DR: In this article, an experimental study was conducted to investigate the effect of two basic welding parameters, i.e., the heat input and the welding speed, on the grain structure of aluminum-alloy welds.
Abstract: The grain structure of the weld metal can significantly affect its resistance to solidification cracking during welding and its mechanical properties after welding. An experimental study was conducted to investigate the effect of two basic welding parameters,i.e., the heat input and the welding speed, on the grain structure of aluminum-alloy welds. Gas-tungsten arc welding was performed under various heat inputs and welding speeds, with thermal measurements in the weld pool being carried out during welding and the amounts and nuclei of equiaxed grains in the resultant welds being examined using optical and electron microscopy. The experimentally measuredG/R ratios and the clearly revealed heterogeneous nuclei together demonstrated the thermodynamic effect of the heat input and welding speed on the weld metal grain structure.

85 citations

Patent
04 May 2001
TL;DR: In this paper, a rotating element pin or element with a geometry to induce frictional energy from the rotating element is used to constrain ejection of material from the zone where the weld is being formed.
Abstract: A method and apparatus for welding thermoplastic materials with a stir welding system using a rotating element pin or element with a geometry to induce frictional energy from the rotating element. A floating constraining surface that has a motion independent of the rotation the pin (preferably stationary) is used to constrain ejection of material from the zone where the weld is being formed. Molten material is retained in the weld region, avoiding weakness and voids at the weld joint. Optionally a system for introducing thermal energy into the weld zone in addition to the frictional energy is used. The system for introducing the thermal energy may be in association with the constraining shoe and/or the rotating tool, or a system independent of these.

85 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023229
2022548
2021270
2020365
2019389
2018463