Influence of resistance butt welding thermal cycle on structure and properties of termomechanically rolled steel

In this article examination of structure and properties of resistance butt welded joints from S700MC high strength steel. 10 mm thick including recording welding thermal cycle recording are presented. The thermal cycle acquisition was performed on purpose build rig with a thermographic camera and a computer. The thermal fields acquisition station consisted of Varocam Head HR thermal camera and computer with Ibris 3 plus software, which enabled control of thermal camera parameters and saving of acquired on a local storage media. Aside from environmental parameters, such as temperature and humidity of surrounding, transmissivity of atmosphere equal to 1 and mean emissivity of steel surface of 0.9 were set. Noticeable impact of welding thermal cycle on strength and plastic properties was observed.