![Sample our Physical Sciences journals, sign in here to start your FREE access for 14 days]({"type":"image" , "src" : "/sda/110819/TOC-Subject-Sample-2021-Physical-Sciences.jpg"})
Abstract
The problem of sidewall incomplete fusion in narrow gap tungsten inert gas (TIG) welding could be well solved when the proper magnetic field was added. However, the various tungsten electrode tips seriously affect the distribution of arc pressure and the quality of welding seams. In addition, it is a 350 A GTA, as this is in a regime in which finger penetration is common. This paper studies the distribution of arc pressure of five different styles of tungsten electrode tips: 30° circular cone, 60° circular cone, 60° circular cone with truncated cone of 2 mm diameter, terrace of 2×2 mm and terrace of 2×0·8 mm with the same welding parameters. The character of arc pressure is verified by assaying the seam cross-section under the controlling magnetic field condition in narrow gap welding. The measuring equipment that we designed independently is creative and applicative in narrow gap TIG welding under magnetic fields.
The authors greatly acknowledge the financial support from the National High-tech R&D Program (grant no. 2008AA092901), the China National Nature Science Foundation (grant no. 51105109), the Natural Scientific Research Innovation Foundation in Harbin Institute of Technology (HIT.NSRIF.201006), State Key Lab of Advanced Welding & Joining, Harbin Institute of Technology and International S&T Cooperation Program of China (grant no. 2011DFR70220).
Notes
This paper is part of a special issue on computed-aided welding engineering