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A New Theoretical Method for Preventing Hot Cracks During Aluminum Alloy Sheet Welding by Transverse Compressive Pre-Stress

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A new mechanical method was proposed for preventing hot cracks generation during welding by transverse compressive pre-stress (TCPS). In brittle temperature range (BTR), a proper TCPS forced upon the weld metal near the trailing of pool could overcome the transverse tensile stress/strain which was caused by the solidification shrinkage and contraction of the weld metal. Thereby, the total plastic strain of the mushy metal was limited below the minimum plastic reservation of material. The model of TCPS was established and the principle of preventing hot cracks was illuminated. Fishbone cracks test results showed that the cracks length decreased as the pre-stress increased. When the TCPL reached 0.3σ s , hot cracks could be prevented eventually.
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Keywords: HOT CRACKS; LIQUID THIN FILM; SIMULATION; SOLIDIFICATION; TRANSVERSE PRE-STRESS

Document Type: Research Article

Publication date: September 1, 2012

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  • Journal of Computational and Theoretical Nanoscience is an international peer-reviewed journal with a wide-ranging coverage, consolidates research activities in all aspects of computational and theoretical nanoscience into a single reference source. This journal offers scientists and engineers peer-reviewed research papers in all aspects of computational and theoretical nanoscience and nanotechnology in chemistry, physics, materials science, engineering and biology to publish original full papers and timely state-of-the-art reviews and short communications encompassing the fundamental and applied research.
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