Equipment for the transportation and storage of LNG must have good properties at temperatures down to -196°C.

The most important material property is good toughness at low temperatures. Weld metal properties are often the limiting factor.

Figure 1: Impact toughness vs oxygen content

Weld metal toughness can vary depending on factors such as welding methods, welding procedure and the choice of filler material.

The most common welding methods are TIG, Submerged Arc and basic coated electrodes.

Table 1: Elga product range for cryogenic applications

Article based on ITW Welding global experience and knowledge.

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