极寒地区S355ML钢埋弧焊焊接工艺开发

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Abstract： The S355ML steel used in extremely cold areas has the characteristics of high strength and strict requirements for low-temperature toughness. By reasonably selecting welding materials and controling the preheating temperature， maximum interlayer temperature and heat input， a submerged arc welding process of S355ML steel is developed for extremely cold areas with low temperature toughness of -50°C 。（剩余3780字）