Steel construction needs to present high plastic properties especially during dynamic load. It is necessary for impact conditions. The way to improve of plastic properties of welds is welding with micro-jet cooling. It is a innovative method of welding. After welding with micro-jet cooling the microstructure of weld presents the high content of acicular ferrite in weld metal deposit. It allows to obtain a high values of the plastic properties. In this paper influence of the micro-jet streams number and the kind of cooling gas on plastic deformation of welds was presented. The aim of the paper is comparison of plastic properties of welds made with and without micro-jet cooling.Keywords: Welding, micro-jet cooling, dynamic load, plastic properties
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