Operator influence on the estimation of arc efficiency in gas tungsten arc welding
2013 (English)In: JOM-17 - International Conference on Joining Materials, 5-8 May 2013, Helsingør, Denmark. Proceedings / [ed] Osama Al-Erhayem, JOM-Institute , 2013Conference paper (Refereed)
In this paper the operator bias in the measurement process of arc efficiency in stationary direct current electrode negative gas tungsten arc welding is discussed. An experimental study involving 15 operators (enough to reach statistical significance) has been carried out with the purpose to estimate the arc efficiency from a specific procedure for calorimetric experiments. The measurement procedure consists of three manual operations which introduces operator bias in the measurement process. An additional relevant experiment highlights the consequences of estimating the arc voltage by measuring the potential between the terminals of the welding power source instead of measuring the potential between the electrode contact tube and the workpiece. The result of the study is a statistical evaluation of the operator bias influence on the estimate, showing that operator bias is negligible in the estimate considered here. On the contrary the consequences of neglecting welding leads voltage drop results in a significant under estimation of the arc efficiency.
Place, publisher, year, edition, pages
JOM-Institute , 2013.
Arc efficiency, gas tungsten arc welding, direct current electrode negative, operator bias, WIL, Work-integrated learning
Manufacturing, Surface and Joining Technology
Research subject ENGINEERING, Manufacturing and materials engineering; Work Integrated Learning
IdentifiersURN: urn:nbn:se:hv:diva-5601ISBN: 87-89582-21-7OAI: oai:DiVA.org:hv-5601DiVA: diva2:649270
JOM-17 - International Conference on Joining Materials. Helsingör, Denmark 5-8 May 2013