Download Modeling, Sensing and Control of Gas Metal Arc Welding by S. Ozcelik, K. Moore and D. S. Naidu PDF

By S. Ozcelik, K. Moore and D. S. Naidu

Arc welding is likely one of the key procedures in commercial production, with welders utilizing varieties of approaches - fuel steel arc welding (GMAW) and fuel tungsten arc welding (GTAW). This new publication offers a survey-oriented account of the modeling, sensing, and automated keep an eye on of the GMAW method.

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Example text

The analysis involves de-coupled heat transfer and thermo-mechanical analysis for the determination of residual stress and distortion. In [58], fluid flow and heat transfer during GMAW of HSLA-100 steel were studied using a transient, three dimensional, turbulent heat transfer and fluid flow model. The temperature and velocity fields, cooling rates, and shape and size of the fusion and HAZs were calculated. To better understand a weld metal microstructure, a continuous cooling transformation (CCT) diagram was computed.

9 INEEL/ISU Model In this section, we briefly describe the GMAW system and its modeling as developed by a collaborative team of researchers from Idaho National Engineering and Environmental Laboratory (INEEL) and Idaho State University (INEEL/ISU)over several years [160, 161]. 9 [162]. The power supply consists of a constant voltage source connected to the electrode and the workpiece. Wire speed S, travel speed R of the torch, open-circuit voltage Vow,and contact tip to workpiece distance CT are adjusted to get the desired weld.

1 H e a t and M a s s Transfer M o d e l for Heat and M a s s T r a n s f e r This material is from the work of Smartt and Einerson [148], in which a steady-state model of the GMAW process is obtained for electrode melting and heat and mass transfer from the electrode to the workpiece. 25) where I is the current from the electric source, E is the secondary circuit voltage drop, V~ is the voltage drop across the electrode, and V ~ is the voltage drop across the arc. 26) where 77 is the heat transfer efficiency from the process to the base metal, and R is the weld speed.

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