@article{stenbacka_2013,  title={On arc efficiency in gas tungsten arc welding},  volume={18},  ISSN={0104-9224},  url={https://doi.org/10.1590/S0104-92242013000400010},  DOI={10.1590/S0104-92242013000400010},  number={4},  journal={Soldagem & Inspeção},  publisher={Associação Brasileira de Soldagem},  author={Stenbacka, Nils},  year={2013},  month={Oct},  pages={380–390} }