document: A study on an automatic seam tracking system by using an electromagnetic sensor for sheet metal arc welding of butt joints Many sensors , such as the vision sensor and the laser displacement sensor , have been developed to automate the arc welding process . However , these sensors have some problems due to the effects of arc light , fumes and spatter . An electromagnetic sensor , which utilizes the generation of an eddy current , was developed for detecting the weld line of a butt joint in which the root gap size was zero . An automatic seam tracking system designed for sheet metal arc welding was constructed with a sensor . Through experiments , it was revealed that the system had an excellent seam tracking accuracy of the order of + or-0 .2 mm
doc_bio_tags: O O O O B I I I O O O B I O B I I I O B I O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B I O O O O O O O O O O O O O O O O O O O O O O O O B I I O O O O B I I I O O B I I I O O O O O O O O O O O O O O O O O O B I I O O O O O O O O
extractive_keyphrases: sheet metal arc welding butt joints automatic seam tracking system electromagnetic sensor root gap size seam tracking accuracy
abstractive_keyphrases: eddy current generation weld line detection