The analysis of stainless steel welded connections made by low energy and classic welding processes

Abstract eng:
Welding of stainless steels, and in particular steels with austenitic structure requires proper technical preparation, appropriate technology and technical knowledge. The main area of research of the experimental part of the work was to compare the classical MIG / MAG welding method with its alternative STT® variant in terms of weldability, i.e. determine the possible advantages in various aspects of welding (weld quality, economy) thanks to the STT® method. For this purpose, joints were made using both methods for two different grades of stainless steels. Samples were cut from such prepared joints, which were subjected to non-destructive, micro- and macroscopic tests. Practical STT® welding tests confirmed the advantage over the classic GMAW method, however, this advantage applies only to a certain type of weld (root) and a thickness not exceeding 6 mm. This means that cost-effectiveness is only possible in the case of a large number of such welds performed during the working day. In another case, anyway, one must use the second welding source to position the groove-filling layers.

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