New Approach for Modelling of the Welding Processes
The applying of new technologies is connected with considerable outlays to receive the optimal welding regimes, metallographic research of welding seams, joint quality control and other facilities, which can be considerable lowered, using modelling of the welding processes. We propose to use new approach for modelling – analogue modelling, which is based on process investigation, using logical functions. Some practical applying examples of the analogue modelling are offered in this paper. The analogue model of the heat input during resistance welding of wires with coating is described in detail. Using analogue modelling we can solve direct problems of thermal conductivity, it mean that we can predict temperature field, obtained as a result of influence of welding source of heat. The effectiveness of analogue modelling using is proven.
RESEARCH ON THE SURFACE COATINGS INFLUENCE ON FORMATION MECHANISM OF THE RESISTANCE WELDS
The goal of the work is the research of formation mechanism of the spot resistance welds in the case of copper wires with nickel and tin coatings. The existing approaches for investigation of the formation mechanisms of welds of wires with and without coatings are analysed. A new approach for modeling of welding joint formation is offered. The analog model of the heat input during resistance welding of
A New Path Forward for Understanding Microstructural Evolution during Welding
Over the past century, the principal method for estimating the sequence of microstructural events that produce the final weld microstructure has been postweld microstructure analysis, and it's the interpretation of these microstructures that sets welding metallurgy apart from other related endeavors. In conjunction with heat flow analysis and thermodynamic principles, the postweld microstructural interpretation of grain sizes and shapes, second-phase particles, interphase boundaries, and composition gradients provide the framework for interpreting the events that lead to the final microstructure. However, without direct and confirming evidence of the actual phases that exist during welding, multiple interpretations for microstructural evolution of welds often occur. For this reason, methods for the direct observation of the phases and phase transformations that occur during welding was developed. This paper summarizes the 2007 Adams Lecture titled "A New Path for Understanding Microstructural Evolution during Welding Using Synchrotron Radiation," where real-time X-ray diffraction methods were presented as a means for the direct observation of phase transformations during welding.