Effects of Root Opening on Physical and Mechanical Properties of the Double Side Welded of Ship Materials

Abstract:

The effects of root opening process parameters on the phisical and mechanical properties of mild steel specimens of grade LR Gr A having dimensions 200 mm× 100 mm× 12 mm, welded by gas metal arc welding were investigated. The variation of root opening that used were 3 mm, 5 mm and 7 mm. The physical properties examined with regard with microstructure, macrosructure, and corrosion using optical microscope and stereozoom. The measured of mechanical properties with regard to strength, hardness and toughness using, tensile test, Vickers hardness Test, and Charpy impact test. The test results show the base metal had a hardness of approximately 110 VHN and a maximum hardness of approximately 190 VHN that corellates with microstructure of weld metals. Microstructure of base metal and HAZ are ferite and perlite, while microstructure of weld zone are acicular ferrite and grain boundary ferrite. The corrosion rate of weld metals with various root opening categorized as materials having excellent corrosion resistance value. Welding joints with opening roots 3 mm and 5 mm can be used for construction. All welded specimens exhibited fracture at base metals

• Periodical: Applied Mechanics and Materials (Volume 835)
• Pages: 167-172
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.835.167
• Online since: May 2016
• Authors: Yustiasih Purwaningrum*, Triyono Triyono, Tegar Rileh Argihono, Ryan Sutrisno
• Keywords: Double Side Weld, Gap of Groove, Hardness, Tensile Strength, Toughness

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