On the 5th April 2011 the 15th professional ESAB seminar took place. The event was organized in cooperation with ESAB and the Faculty of Materials Science and Technology STU in Trnava, which was also the venue of the seminar. After the registration 170 participants the opening of a seminar followed. The topic of the seminar was welding and weldability. In addition to acquiring theoretical knowledge, the participants had the opportunity to see new welding equipment from ESAB.