Topic
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.
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TL;DR: In this article, the effect of tool rotation speed on the stir zone characteristics and the resultant tensile properties of the FSW and UWFSW joints was investigated. And the results showed that the UWFSW joint made using the lower tool rotational speed of 1200-rpm exhibited superior tensile property than FSW joints.
60 citations
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TL;DR: In this paper, the effects of electrode force on the electrical, thermal and mechanical behavior of the welding process when using direct current have been studied numerically using the finite element method, and the variations of contact radius, current density distribution and temperature profile at the sheet/sheet and electrode/sheet interfaces, the threshold weld times and the maximum diameters of the weld nuggets under three different levels of electrode forces are investigated.
60 citations
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TL;DR: In this paper, the effect of welding speed on the quality of a lap weld joint in the Al and Cu sheets with a single mode fiber laser was investigated and it was found that sound strong weld joints could be produced by suppressing the formation of intermetallic compounds in the interface zone at extremely high speeds.
Abstract: Conventional fusion welding of aluminium and copper dissimilar materials is difficult because of poor weldability arising from the formation of brittle intermetallic compounds on the weld zone as well as different chemical, mechanical and thermal properties of welded joints. Joining of Al and Cu plates or sheets offers a metallurgical challenge due to unavoidable formation of brittle intermetallic compounds. Therefore, it is necessary to effectively suppress the formation and growth of Al–Cu intermetallic compounds. For welding of dissimilar Al and Cu sheets, no systematic work has been conducted to reduce these defects. Thus, this paper focuses on the effect of welding speed on the quality of a lap weld joint in the Al and Cu sheets with a single mode fibre laser. It was found that consequently sound strong weld joints could be produced by suppressing the formation of intermetallic compounds in the interface zone at extremely high speeds.
60 citations
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TL;DR: In this article, the effects of shielding gas, heat input and post-weld heat treatment on the microstructural evolution and wear resistance of a modified AISI H13 martensitic tool steel deposited by semi-automatic gas shielded arc welding process using a tubular metal-cored wire, were studied.
60 citations
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TL;DR: In this paper, one lean, one standard 22 %Cr and one superduplex stainless steel were autogenously laser welded bead-on-plate and MIG-laser hybrid welded with recommended fillers.
Abstract: There is a growing interest in the use of low energy input welding methods, often with little or no addition of filler material, for welding of duplex stainless steels. In the present study, therefore one lean, one standard 22 %Cr and one superduplex stainless steel were autogenously laser welded bead-on-plate and MIG-laser hybrid welded with recommended fillers. The energy inputs ranged from 0.1–0.6 kJ/mm. Ferrite contents were generally high (65–99 %) with autogenous laser welding resulting in the highest levels. The addition of fillers had a larger effect on ferrite content than increasing energy inputs. Evaluation of weld metal ferrite content and the tendency to form nitrides suggest that the superduplex steel, closely followed by the lean grade, are most suited for low energy input welding. The standard 22 % Cr steel requires the most careful optimization of procedures to produce an acceptable weld metal microstructure. The overall conclusion is that low energy input welding methods could be applied to duplex stainless steels. However, high nitrogen grades are more suitable and care must be taken to ensure sufficient austenite formation.
60 citations