...P. S. Wei; C. L. Lin; H. J. Liu; C. N. Ting This study presents a numerical scenario for the effect of thermocapillary convection on the transient, two-dimensional molten pool shape during welding or melting. Tracing the melting process is necessary to achieve a better and more complete...

...Panjawat Kongsuwan; Gen Satoh; Y. Lawrence Yao Femtosecond laser pulses were focused on the interface of two glass specimens. Proper use of optical and laser processing parameters enables transmission welding. The morphology of the weld cross section was studied using differential interference...

...Axel Fehrenbacher; Neil A. Duffie; Nicola J. Ferrier; Frank E. Pfefferkorn; Michael R. Zinn The objectives of this work are to determine an accurate temperature feedback strategy and to develop a closed-loop feedback control system for temperature in friction stir welding (FSW). FSW is a novel...

...ZhenZhou Wang; YuMing Zhang; XiaoJi Ma The reflection of projected laser lines may be used to determine the three-dimensional geometry of the reflecting weld pool surface. However, for gas metal arc welding (GMAW), the transfer of the droplets into the weld pool makes the weld pool surface highly...

...Dongyul Lee; Ki Eak Kwon; Jaeyeol Lee; Haeseong Jee; Hyunjune Yim; Seong Wook Cho; Jong-Gye Shin; Gyubong Lee A general and efficient methodology has been developed to analyze dimensional variations of a welded assembly, taking into account of weld distortion. Weld distortion is generally...

...Bin Shen; Guoxian Xiao; Changsheng Guo; Stephen Malkin; Albert J. Shih A new thermocouple fixation method for grinding temperature measurement is presented. Unlike the conventional method using a welded thermocouple, this new method uses epoxy for affixing the embedded thermocouple within a blind...

...T. A. Palmer; J. W. Elmer Process control in electron beam welding is typically based on control of machine settings, such as accelerating voltage, beam current, focus coil current, and vacuum level. These settings, though important, provide little insight into the characteristics of the beam used...

...James D. Van de Ven; Arthur G. Erdman Gaps at part interfaces pose a major challenge for laser transmission welding (LTW) of thermoplastics due to the reliance on contact conduction between the absorptive and transmissive parts. In industrial applications, gaps between parts can occur for a variety...

...L. Zhang; P. Michaleris; P. Marugabandhu Large and complex structures such as ship panels generally have various types of welding-induced distortions including angular deformation, longitudinal bending, and buckling. Developing efficient methodologies for modeling welding distortions and residual...

...Matt Bravar; Neil Krishnan; Brad Kinsey Tailor welded blanks (TWBs) offer several notable benefits including decreased part weight, reduced manufacturing costs, and improved dimensional consistency. However the reduced formability and other characteristics of the forming process associated...

...Wei Lu; Y. M. Zhang; John Emmerson Practical welding control systems require durable/compact sensors to sense the welding process and appropriate control algorithms to produce smooth welds. A novel arc welding sensor, referred to as nontransferred plasma charge sensor, which requires no additional...

...A. De; K. Momeni; M. P. Thaddeus; L. Dorn The influence of the machine specific instantaneous current wave forms on weld nugget dimensions and weld strength is investigated over six spot welding machines. It is observed that the nature of the real-time current wave forms corresponding to a common...