Measurement of weld joint parameters and their mathematical modelling

Novák, Daniel, 1952-

Measurement of weld joint parameters and their mathematical modelling / D. Novák ... [et al.]. -- © 2017, Eesti Pollumajandusulikool. All rights reserved. The article deals with verifying of weld quality of weld joints created by laser beam welding technology, primarily in agricultural components such as reel screws. We presents both metallographic check of the weld structure using electron microscopy, RTG-microanalysis and micro hardness measurement as well as used mathematical models of the welding process and respective weld joints geometry. First the laser beam welding technology and concerned agricultural components are introduced. Further we specify individual steel types as well as laser types and we define specific welding parameters used in our measurements. We selected several samples of weld joints, which are further examined them in detail using optical microscopy, micro hardness measurements and RTG microanalysis. We further determined the weld shape, measured dimensions of individual weld joints as well as we checked the weld joints structure. We further introduced a mathematical model based on the program ANSYS. The model can simulate temperatures, speed field and tensions within the weld joint, basing on known thermal conductivity of the base material and specified welding conditions. Using the model, we can predict the shape of the weld and the temperatures within the material. Finally, individual welding parameters and obtained weld joint samples are briefly discussed and the applicability of the model is evaluated.

In Agronomy Research. -- Tartu : Estonian University of Life Sciences, 2017. -- ISSN 1406-894X. -- ISSN 2228-4907. -- Vol. 15, special no. 1 (2017), pp. 1127-1140