Proceedings of the
9th International Conference of Asian Society for Precision Engineering and Nanotechnology (ASPEN2022)
15 – 18 November 2022, Singapore

Mechanical Performance of ER70S-6 Low-Carbon Steel Fabricated by Wire Arc Additive Manufacturing

Shibo Liu1,a, Peng Chen1, Sun Xianchong1,b, Ang Joo Hock2, Xiling Yao1, Du Zhenglin1 and Youxiang Chew2

1Singapore Institute of Manufacturing Technology, 73 Nanyang Drive, 637662, Singapore

2Sembcorp Marine Ltd. 80 Tuas South Boulevard, Singapore 637051


Wire arc additive manufacturing (WAAM) is well-recognized as an efficient wire-based deposition process for the repair and fabrication of large metallic parts. However, the cost of additive feedstock material remains a key barrier to the adoption of this additive manufacturing technology. In this study, a WAAM process of a low-cost, commonly used welding filler material, ER70S-6 low-carbon steel, was performed to assess the formability of bulk parts. The weld bead dimensions with varying cold metal transfer (CMT) parameters will be mapped and presented. Block samples were prepared using the optimized process parameters at a deposition rate of 4.3kg/hour. Experimental results showed that the hardness and tensile properties of as-deposited ER70S-6 are sensitive to the thermal conditions during the deposition process. Furthermore, Si-rich oxides segregations were observed in the cross-sectional analysis of as-deposited parts. The influences of these Si-enriched islands on the mechanical properties will be discussed. The investigation aims to contribute to more potential applications of WAAM processing of cost-effective low-carbon steel for the marine & offshore industry.

Keywords: Wire Arc Additive Manufacturing, Cold Metal Transfer, Low Carbon Steel.

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