Research regarding classroom pedagogy of subject specific contents in the field of technical vocational education is scarce, nationally in Sweden, but also in an international perspective. This paper presents results from a Swedish action research project and it aims at exploring the process of a learning study, which deals with the settings in MIG/MAG welding and the intervention of the new pedagogic approach CAVTA (Conversation Analysis and Variation Theory Approach). The empiric material consists of video recorded welding education in a workshop and documented meetings in a welding teacher team. The theoretical toolbox of CAVTA permeates the teaching and learning processes as the teachers in the intervention try to implement patterns of variation in the planning, enactment and evaluation of the teaching and learning processes. In combination with the variation theoretic principles embedded in the teaching, ideas inspired by conversation analysis are implemented – the main element being an enhanced interaction, thus enabling for the students to display their understanding of the subject specific contents. The results show how CAVTA can be integrated in the teaching of settings regarding MIG/MAG welding, so that certain aspects of the object of learning is visualized. Furthermore, the findings show how the integration of CAVTA support the manifestation of a student’s understanding of the object of learning. How variation and the use of several senses and simultaneous different semiotic resources are activated as essential components in the teaching and learning processes, is made explicit in the paper. Plans for a recently launched research project including several different technical vocational education programs are also presented. The lack of classroom studies regarding technical vocational education calls for exploration in research, but should not avoid the ambition of development. This study captures the design and the development of a new pedagogic approach. Our hope is that the study will contribute to a growing body of knowledge within the field of technical vocational education and spur on further studies in this field of research.