Abstract
A high efficiency TIG welding method was developed, which employs two electrodes within a single torch. This system is shown to produce consistent penetration in the groove wall and high deposition rate, making it well suited for application to the construction of large capacity LNG storage tanks and thick walled pressure vessels. Authors have applied this new TIG welding method in the construction of an inner tank for PCLNG storage tank. The material of tank wall is 9% Ni steel. Proper welding condition for vertical and horizontal welding position (peripheral welding position) were selected, and sound joint properties were confirmed. For the practical application, stable welding procedures were developed. In result, it achieved greatly improving joint quality and reducing construction time.
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