Abstract
Due to its excellent toughness and stiffness in cryogenic conditions, 9% nickel steel is applied to LNG storage facilities, and its usage is increasing as a result of changes in environmental regulations. A study was conducted on the development of a predictive model to optimize the laser welding process of 9% nickel steel, and two prediction models were developed using one hundred data points obtained through experiments. A global regression model used as a general prediction model and a modified regression model using the p-value of the analysis of variance were developed, and their prediction performance was compared. It was found that the modified regression model was superior to the global regression model in terms of predicting the bead shape, including parameters such as penetration depth, bead height, and area ratio.
Highlights
Part 1: Global Regression Model vs.Ship emission regulations are being strengthened in accordance with global environmental regulations to prevent climate change
The 9% nickel steel is used as a material for cryogenic tanks such as liquefied natural gas (LNG), and recently has been used as a material for LNG fuel tanks because of its relatively high yield strength/tensile strength compared to other materials
A global regression model and a modified regression model were developed to the bead shape of the laser welding of 9% regression nickel steel.model
Summary
Part 1: Global Regression Model vs.Ship emission regulations are being strengthened in accordance with global environmental regulations to prevent climate change. With the application of LNG fuel, the material used for fuel tanks has been changing, with the stainless steel 304L, aluminum alloy 5083-0, and Invar that were used in low temperature environments in the past being replaced with 9% nickel steel to reduce costs [3]. There are several factors that determine the thickness of an LNG fuel tank, among which the minimum yield/tensile strength is an important factor. The 9% nickel steel has the disadvantage that after welding, the welding strength is reduced and the tank thickness increases [4]. The strength of this part can be increased and the thickness of the tank reduced [5]
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