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Indexed by:期刊论文

Date of Publication:2017-04-01

Journal:INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING

Included Journals:SCIE、Scopus

Volume:18

Issue:4

Page Number:623-628

ISSN No.:2234-7593

Key Words:MAG-TIG double-arc welding; Thick mild plate; Backing (root) welding; One side welding with back formation

Abstract:MAG-TIG (metal active gas-Tungsten inert gas) double-arc welding process is applied to make stable back beads in the first layer during one-side multilayer welding without backing plate. To explain the reason why stable back beads can be formed, a comparison was made between single MAG welding and MAG-TIG double-arc welding. Results indicated that during the optimized condition in MAG-TIG double-arc welding, about one-third heat energy of the heat source acts on the root face, and about two-third heat energy acts on the molten pool. The distribution of temperature and surface tension in the molten pool must be more balanced and reasonable, in order to obtain the ideal back weld bead formation. This process is a new welding process giving high quality and efficiency in root welding of thick plate.