Weldability of STS316L for LNG Carrier by Fiber Laser

Abstract

These days, world wide interest about global warming and environmental pollution and exhausting fossil fuel which have been main energy source in all around the world. So many country have tried to find out the solution by investing new & renewable and clean energy. Therefore LNG have been widely used as a substitution of fossil fuel and clean energy that emits less pollutant like SOx, NOx. Therefore LNG consumption has been quickly raised and LNG carriers have been getting larger for decades. In this study, high power fiber laser was used for welding of stainless steel for LNG carrier to increase its productivity. Used material was STS316L which has low carbon less than 0.03% and its thickness was 8 mm. We carried out bead, lap and butt welding by using the fiber laser which has maximum power up to 5kW. As a result, we could find out that lap and butt joint was possible at welding speed of 2.0m/min and 3.0m/min respectively.

A Study on the Development of an Optimization Algorithm and Determination Procedure for Toughness Deterioration Characteristics through Flux Core Arc Heat Input Control of ASTM A553-1 (9% Nickel Steel)

“…H i ≥ 4.29 × 10 12 J/cm 2 , H i ≤ 3.75 × 10 12 J/cm 2 (12) Based on the multi-purpose optimization algorithm defined as described above, Test No. 5 and 6 were selected to go through the optimization procedure, and to satisfy the limits according to the algorithm flow chart.…”

“…Looking at earlier studies on LNG storage tanks, Kim studied laser welding as a new welding process for manufacturing the TGZ MARK III membrane tank made of STS304L, as an alternative to the GTAW process that has been used thus far [12,13]. Baba reviewed the applicability of a new ultrasonic flaw detection method TOFD (Time of Flight Diffraction) as a non-destructive inspection method for a weld of an A5083-O spherical tank for an LNG carrier.…”