Abstract
Nine percent nickel steel has excellent properties in a cryogenic environment, so it has recently been used as a tank material for most LNG fuel-powered ships. However, 9% nickel steel causes arc deflection due to its tendency of magnetization during manual FCAW welding and the currently used filler metal is 10–25 times more expensive as a base metal compared to other materials, depending on manufacturers. Furthermore, the properties of its filler metal cause limitation in the welding position. To overcome these disadvantages, in this study, the tendency of penetration shape was analyzed through a fiber laser Bead on Plate (BOP) welding for 9% nickel steel with a thickness of 6 mm and a range of welding conditions for 1-pass laser butt welding of 6 mm thick 9% nickel steel with I-Groove were derived. Through this study, basic data capable of deriving optimal conditions for laser butt welding of 9% nickel steel with a thickness of 6 mm were obtained.
Highlights
As environmental pollution and global warming issues come to the fore, the demand for eco-friendly energy is increasing and environmental regulations are becoming stricter.In this environment, natural gas (NG) is in the spotlight because it emits a lower volume of pollutants than petroleum [1,2]
Since the NG production area is very limited around the world, it is transported in the form of liquefied natural gas (LNG) after liquefaction
LNG has a cryogenic temperature of −163 degrees Celsius and there is a risk of explosion in the event of a leak, so extreme care is required during handling
Summary
As environmental pollution and global warming issues come to the fore, the demand for eco-friendly energy is increasing and environmental regulations are becoming stricter. In this environment, natural gas (NG) is in the spotlight because it emits a lower volume of pollutants than petroleum [1,2]. Under the condition of −163 degrees Celsius, other steel materials including SS400 cannot be used due to brittleness and metals without low-temperature brittleness must be used. The material for LNG fuel tanks ordered recently is 9% nickel steel, and most of them are manufactured by FCAW (Flux-cored Arc Welding) welding. Basic research was conducted to apply laser welding to overcome the FCAW
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