What is nucleation in welding?
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| Papers (14) | Insight |
|---|---|
14 Citations | Modifying electrode force during welding cycle is a valid method to obtain acceptable nugget with shorter welding time or less energy. |
14 Citations | Some of these particles remain undissolved at the peak temperature of a welding thermocycle and may result in sympathetic nucleation of new particles on them. |
25 Citations | The effects of welding current and current duration to nugget nucleation can be characterized by the characteristic parameters of acoustic emission signals. |
111 Citations | The nucleation mechanism may also arise in other contexts. |
01 Jan 1984 | Thus, in this case, nucleation is controlled by the combustion process. |
17 Citations | revealed that the nucleation mechanism was heterogeneous nucleation, rather than grain detachment and dendrite fragmentation. |
01 Sep 2016 | The results revealed that the welding speed is most significant process parameter. |
| In the case of heterogeneous nucleation, we can also obtain at least some information on what is responsible for nucleation. | |
| This enables high deposition rate welding for significant increase in productivity. | |
18 Citations | It proved that the jet formation is an important condition for the solid-state welding. |
129 Citations | However, to what extent these can be related to nucleation behavior on larger (industrial) scales is not known. |
25 Citations | The results showed that the physical phases of nugget nucleation can be characterized by the acoustic emission signals detected during the resistance spot welding process. |
| The results indicated that critical nucleation radiuses in two models are the same, which were slightly affected by welding current. | |
42 Citations | It is, thus, accepted as a clean welding process that can produce acceptable quality joints. |
Related Questions
What recent developments have been made in the field of nucleation in polymeric biomaterials?4 answersRecent developments in the field of nucleation in polymeric biomaterials have focused on understanding the complex pathways of biopolymer self-assembly. These pathways involve a two-step mechanism where monomers condense to form metastable intermediates, which then convert to stable polymers through conformational rearrangement. The dynamics of conversion events play a crucial role, as they occur on comparable timescales to condensation and growth, impacting the accumulation rate of stable phases. Mathematical models have been proposed to explicitly account for simultaneous assembly and conversion, providing insights into the kinetics of nucleation intermediates and stable phases in polymeric systems. These advancements offer a deeper understanding of nucleation processes in polymeric biomaterials, with implications for various biomedical applications.
How do Ice nucleating particles affect the arctic climate system?4 answersIce nucleating particles (INPs) have a significant impact on the Arctic climate system. The Arctic region experiences polar amplification, causing it to warm at a faster rate than the global average. INPs play a crucial role in initiating ice formation in Arctic mixed-phase clouds, which affects cloud radiative properties and precipitation formation. The sources, abundance, and properties of INPs in the Arctic are highly variable, with contributions from both terrestrial and marine sources. INPs can be transported over long distances, indicating the importance of local and remote sources. The presence of INPs in thawed permafrost suggests that they can be emitted into the atmosphere, potentially influencing the Arctic INP budget. Understanding the behavior and characteristics of INPs is crucial for accurate climate modeling and predicting the future of the Arctic climate system.
Where are nucleated settlements found in Brazil?5 answersNucleated settlements in Brazil are found in the Rio Bec micro-region, specifically at the eponymous site. However, there is no evidence that these settlements underwent significant, sustainable nucleation on a broad sociopolitical level. In terms of urban nuclei, open spaces in Latin America were characterized by landmarks such as pillories, churches, and governmental buildings. Examples of these urban configurations in Brazil include Franciscan conventual forecourts, Jesuit buildings, public squares, and military parade grounds. The first Portuguese settlement in Brazil, known as "Cabo Frio," was likely located on Gato Island or the Governador's Island in Guanabara Bay. As for emergency planning, a study conducted around a Nuclear Power Plant in Angra dos Reis, Brazil, suggests that evacuation plans should be focused on urban cores with low road availability or high population density areas with increased road traffic and population flow.
What are the different types of secondary nucleation?3 answersSecondary nucleation can occur in various systems, including the crystallization of small molecules or proteins, self-assembled materials, protein self-assembly into fibrous structures, and amyloid formation. In the context of amyloid formation, secondary nucleation leads to the formation of toxic oligomers. The mechanisms of secondary nucleation can be influenced by factors such as interparticle energies, molecular chirality, and crystal-impeller contacts. Secondary nucleation can be enhanced by mutations or screening of electrostatic repulsion. Understanding the molecular determinants and driving forces behind secondary nucleation is important for controlling the formation of higher order structures in supramolecular polymers. Additionally, secondary nucleation plays a significant role in industrial-scale nucleation processes.
What is nucleation?5 answersNucleation is a process that initiates phase transitions. It is the first step in the formation of many materials and is crucial for improving synthesis of existing materials and predicting the formation of novel materials. Nucleation describes the formation of the first seeds of a new phase and is responsible for phase transitions in various systems, ranging from atomic to planetary scales. It is a non-equilibrium physical mechanism that controls and triggers phase transitions, such as biological assembly and galaxy formation. Nucleation involves the aggregation of molecules, atoms, or ions, finding the right relative orientations to start growing and form the final crystal structure. It can be achieved by putting a system into a nonequilibrium metastable state, such as compressing vapor to a pressure exceeding the saturation vapor pressure.
Which part of Brazil has nucleated settlement?8 answers