Fume Formation Rate Analysis of Shipbuilding Steel with SMAW Using Taguchi Design and ANOVA

Abstract

Shipbuilding industry grows rapidly due to the increasing growth of economies and thus, the need for new and bigger ships emerge. Manufacturing of ships in shipyards includes harmful processes, such as welding, which impact the workers and the environment. As a consequence of increase in demand for new ships, deleterious welding fume and emissions all over the world increase year by year. Welding fume includes hazardous micro and sub-micro sized metal particulates and in addition to welding fume, welding emissions consist of detrimental gaseous wastes as well. In this study, a set of experiments was designed by Taguchi method. These experiments were realized by two welders using two different types of covered electrodes (rutile and cellulosic), welding speeds and currents on Grade A shipbuilding steel, which is one of the most common steels in shipbuilding. After the experiments, fume formation rate was measured and it was observed that the contributions of the factors are 92.47%, 5.42% and 1.66% for electrode type, current and welder, respectively. The results were assessed using Taguchi and ANOVA and evaluated in terms of environment and occupational health and safety.

Improving Shipbuilding Steel Grade Quality at Stages of Smelting, Secondary Refining, and Continuous Casting

“…Metals 2019, 9,203 3 of 7 of the nonmetallic inclusions found were performed using a ZEISS SUPRA 55VP (Carl Zeiss AG, Germany) scanning electron microscope. This microscope is equipped with an electron beam computer control scanning system and digital signal and image recording, as well as an INCA WAVE (Oxford instrument, Oxfordshire, UK) and INCA X-MAX (Oxford instrument, Oxfordshire, UK) X-ray micro-analyzer.…”

“…Thus, chemically and structurally inhomogeneous CCBs undergo uneven thermal mechanical processing, during which microstructural banding is formed inherited from dendritic heterogeneity, and a segregation band inherited from axial point and/or zonal segregation. In the areas poorly developed during hot rolling, there will remain structural components morphologically inherited from the structure of the cast metal, such as Widmanstatten ferrite, coarse austenite grains inherited from uncrushed cast crystals [9,10].…”

Feasibility of the Inverse-Dispersion Model for Quantifying Drydock Emissions

“…Celebi et al (2017) investigated air pollutant emissions from the manual metal arc welding of shipbuilding steel [10]. Mert and Ekinci (2017) studied the fume formation rate analysis of shipbuilding steel with shielded metal arc welding [11]. Celebi and Vardar (2008) investigated VOC emissions from indoor and outdoor painting processes in shipyards [6].…”

Microstructural and Mechanical Characterization of Shielded Metal Arc Welded Dual Phase Steel Joints

“…Furthermore, input process parameters such as current, voltage, arc gap, welding speed, electrode orientation play a vital role in the quality of the weldment. Therefore, Taguchi method was used to optimize the welding parameter [21][22][23]. Since dual-phase steels are widely required in automobile manufacturing, the research works focused on automotive welding processes (RSW, LW) and Shielded Metal Arc Welded Dual Phase steel joints has not been undertaken.…”