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Affiliation of Author(s):材料科学与技术学院

Title of Paper:Comparison between weave bead welding and multi-layer multi-pass welding for thick plate Invar steel

Journal:INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY

Key Words:Invar steel Weave bead welding Temperature field simulation Microstructure Tensile test

Abstract:The welding technology of weave bead welding (WBW) and multi-layer multi-pass welding (MLMPW) are considered to offer advantages over fusion welding in terms of thick plate. The present paper employs a 19.05-mm thick Invar steel plate as the research object to compare the quality of welded joints using WBW and MLMPW. A temperature field model of WBW is established using finite element method; transient temperature field and welding thermal cycle curves of WBW are compared with the ones of MLMPW, which indicates that the characteristic of WBW molten pool periodically changes over time and its temperature distribution is uneven. Moreover, the examinations and analyses of macro/microstructures of WBW and MLMPW are conducted. The results indicate that the inter-layer of Invar steel using WBW is fused better than the one using MLMPW. Perfect weld seam with no defects and a grain growth mechanism of epitaxial solidification of WBW are clearly exposed. The width of heat affected zone (HAZ) using WBW is roughly narrower than that of MLMPW. In addition, the tensile test is conducted to demonstrate that the WBW welded joint has the higher quality.

ISSN No.:0268-3768

Translation or Not:no

Date of Publication:2017-02-01

Co-author:Zhang Dan,Liu, Xiangbo,Jason,Wei Yanhong,Zhou, Junjie,lrp

Correspondence Author:Xiaohong Zhan