NIST Special PublicationThe Institute, 2002 |
From inside the book
Results 6-10 of 52
Page 22
... transfer while imaging a weld pool was not solved because of the inaccurate open - loop control that was used to determine the instant of the droplet detachment . Also , the camera had some limitations , such as the shutter speed and ...
... transfer while imaging a weld pool was not solved because of the inaccurate open - loop control that was used to determine the instant of the droplet detachment . Also , the camera had some limitations , such as the shutter speed and ...
Page 23
... transferred to the workpiece may be flexibly regulated by the adjustment of average welding current . Both the static force balance theory and the 43 49 pinch instability theory reveal that the ODPP approach , characterized by ...
... transferred to the workpiece may be flexibly regulated by the adjustment of average welding current . Both the static force balance theory and the 43 49 pinch instability theory reveal that the ODPP approach , characterized by ...
Page 24
... transfer mode where the droplet suspends at the tip of an electrode wire for a comparatively longer time because the electromagnetic force inside the droplet is not large enough to detach it ( Ref . 11-13 ) . This type of oscillation is ...
... transfer mode where the droplet suspends at the tip of an electrode wire for a comparatively longer time because the electromagnetic force inside the droplet is not large enough to detach it ( Ref . 11-13 ) . This type of oscillation is ...
Page 26
... transfer control and the weld pool imaging . The acquired images viewed at different camera positions are shown in Fig . 3. It can be seen that the metal transfer process is avoided while the image of a weld pool is captured . The side ...
... transfer control and the weld pool imaging . The acquired images viewed at different camera positions are shown in Fig . 3. It can be seen that the metal transfer process is avoided while the image of a weld pool is captured . The side ...
Page 27
... transfer . 4. Imaging of a weld pool can be reliably triggered by a delayed flag signal generated during the period of a base current . In a cycle , droplet detachment and image acquisition can be compatibly accomplished . 5. In ...
... transfer . 4. Imaging of a weld pool can be reliably triggered by a delayed flag signal generated during the period of a base current . In a cycle , droplet detachment and image acquisition can be compatibly accomplished . 5. In ...
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Common terms and phrases
algorithm analysis angular distortion arc length arc voltage average current background duration boundary butt weldment calculated camera coefficient of variation detachment during peak developed droplet detachment dynamic effect electrode equation experimental Figure filler metal Friction Stir Welding geometry GMAW GMAW-P GTA weld GTAW hoop stress increase interface keyhole laser machine vision martensite material measured mechanical melting metal arc welding method microstructure mm/min mm/s mode molten pool monitoring NIST oscillation frequency peak duration penetration plasma arc welding plate predicted procedure pulsed current resetting residual stress robot rotational sensor shear stress shown in Fig splash strain structure surface technique Technology thermal types of droplet variation VPPAW waveform weld diameter weld fixture weld joint weld pool weld quality welding current Welding Journal welding parameters welding power supply welding process welding simulation welding speed width wire feed speed workpiece zone
Popular passages
Page ii - Certain commercial equipment, instruments, or materials are identified in this paper in order to adequately specify the experimental procedure. Such identification does not imply recommendation or endorsement by the National Institute of Standards and Technology, nor does it imply that the materials or equipment identified are necessarily the best available for the purpose.
Page 94 - Proceedings of the institution of Mechanical Engineers; Part B: Journal of Engineering Manufacture, Vol. 207, pp.9- 1 4, 1 993 [4] Soar RC and Dickens, PM, "Design of Laminated Tooling for High Pressure Die -Casting," Proceedings-SPIE The international society for Optical Engineering, pp.
Page 123 - Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy.