Topic
Plasma arc welding
About: Plasma arc welding is a research topic. Over the lifetime, 8741 publications have been published within this topic receiving 89765 citations. The topic is also known as: PAW.
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Patent•
16 Sep 1998
TL;DR: In this article, a corona discharge is generated on a surgical handpiece which is used to ignite a plasma arc for surgical operations, and a non-uniform electric field is generated between the active electrode, and the corona return electrode of sufficient strength so that a Corona is formed near the active electrodes.
Abstract: An apparatus and method for igniting plasma (19) in a surgical system (10) is disclosed. A corona discharge (14) is generated on a surgical handpiece which is used to ignite a plasma arc for surgical operations. The advantages include greater reliability, and repeatability of plasma arc ignition. The apparatus comprises a handpiece incorporating an active electrode, a passage for ionizable gas (12), and a corona return electrode (18). The corona return electrode has a terminus on the holder, and near the distal end of the holder. The corona return electrode is electrically connected to the return path (15) of the electro-surgical generator (16). A nonuniform electric field is generated between the active electrode, and the corona return electrode of sufficient strength so that a corona is formed near the active electrode. A separate return electrode may be on the patient, or the apparatus may be configured for bipolar electro-surgical operation by carrying the return electrode on the handpiece. A dielectric material separates the active electrode, and the corona return electrode. There is substantially capacitive coupling between the active electrode, and the corona return electrode. There is substantially resistive coupling between the active electrode, and the return electrode.
813 citations
Patent•
01 Mar 1996
TL;DR: In this paper, a corona discharge is generated on a surgical handpiece which is used to ignite a plasma arc (19) for surgical operations, and the corona return electrode (17) is electrically connected to the return path of the electrosurgical generator.
Abstract: An apparatus and method for igniting plasma in a surgical system is disclosed. A corona discharge is generated on a surgical handpiece which is used to ignite a plasma arc (19) for surgical operations. The advantages include greater reliability and repeatability of plasma arc (19) ignition. The apparatus comprises a handpiece incorporating an active electrode, a passage for ionizable gas (12), and a corona return electrode (17). The corona return electrode (17) has a terminus on the holder (11) and near the distal end (20) of the holder (11). The corona return electrode (17) is electrically connected to the return path of the electrosurgical generator. A non-uniform electric field is generated between the active electrode (14) and the corona return electrode (17) of sufficient strength so that a corona is formed near the active electrode (14). A separate return electrode (17) may be on the patient (25), or the apparatus may be configured for bipolar electrosurgical operation by carrying the return electrode (17) on the handpiece. A dielectric material separates the active electrode (14) and the corona return electrode (17). There is substantially capacitive coupling between the active electrode (14) and the corona return electrode (17). There is substantially resistive coupling between the active electrode (14) and the return electrode (17).
572 citations
TL;DR: In recent years, major advances have taken place in our understanding of welding processes and welded materials because of the complexity of fusion welding processes, solution of many important contemporary problems in fusion welding requires an interdisciplinary approach as mentioned in this paper.
Abstract: In recent years, major advances have taken place in our understanding of welding processes and welded materials Because of the complexity of fusion welding processes, solution of many important contemporary problems in fusion welding requires an interdisciplinary approach Current problems and issues in fusion welding are reviewed Solution of these problems, apart from being a contribution to the advancement of science, is also necessary for science-based tailoring of composition, structure, and properties of the welded materials
454 citations
TL;DR: In this paper, a working envelope for the process using Ti-6Al-4V was developed, and regression models were calculated for total wall width, effective wall width and layer height.
434 citations
TL;DR: In this paper, the maximum current density in the vicinity of the cathode was determined by measuring the size of the molten cathode tip (thoriated tungsten) for a given arc current.
Abstract: Although the high‐intensity, free‐burning argon arc has been the object of many studies, modeling of the entire arc has been precluded because of complexities due to the interaction of electric, magnetic, fluid dynamic, and thermal effects, and the associated lack of realistic boundary conditions, in particular, close to the cathode. For establishing the most crucial boundary condition, which is the current density in the vicinity of the cathode, the maximum current density has been determined experimentally by measuring the size of the molten cathode tip (thoriated tungsten) for a given arc current. Calculated temperature profiles for a 100‐ and 200‐ A atmospheric pressure argon arc (electrode gap of 1 cm) are in good agreement with spectrometric measurements based on absolute line and continuum intensities. The arc current and arc current distribution are not only responsible for the temperature distribution in the arc, but also for the magnetohydrodynamics (MHD) pumping action in the cathode region, i.e., the arc behavior is mainly controlled by the current. In contrast to the sensitivity of the current density boundary condition on the results, the calculations show that variations of the boundary condition for the flow field are insignificant.
404 citations