Calculation-experimental method for the determination of the temperature field in laser welding

• Published in: Welding international Vol. 21; no. 5; pp. 387 - 390
• Main Authors: Karkhin, V.A., Khomich, P.N., Ossenbrink, R., Mikhailov, V.G.
• Format: Journal Article
• Language: English
• Published: Taylor & Francis Group 01.05.2007
• ISSN: 0950-7116; 1754-2138
• DOI: 10.1080/09507110701455574

In the prediction of processes taking place in the individual zones of the welded joint, it is necessary to obtain information on the temperature field (the distribution of maximum temperature, the cooling rate, the holding time in the specific temperature range, etc). The currently available calculation procedures' make it possible to determine with sufficient accuracy of the temperature away from the weld pool but result in a larger error of the calculation in the vicinity of the weld pool. These difficulties are caused by the complicated nature of the physical processes in the weld pool (interaction of the heat source and liquid metal, convection and evaporation of the liquid, phase transitions, etc). The shape of the welded joint and of the temperature field in the heat affected zone (HAZ) is determined by complicated models and appropriate computer programs. They require temperature dependences of many physical quantities (viscosity, the surface tension coefficient, etc), time and a high qualification of investigators.