-30℃超低温厚钢板焊接施工技术

Welding construction technology in ultra low temperature -30 ℃ thick plate

东北第一高楼——沈阳市府恒隆广场钢结构工程建筑总高度350.6 m,工程总用钢量约6万t,具有体量大、高度高、结构复杂等特点。工程采用Q345C和Q345GJC钢材,涉及最大板厚100 mm,个别结构部位焊缝密集、焊接填充量近500 kg。由于工程地处寒冷的东北地区,冬季施工长达5个月,室外最低温度可达-30℃,采用常规焊接技术难以进行。为了使钢结构冬季施工得以实施,制定了-30℃超低温厚钢板焊接施工技术,有效地控制了焊接残余应力和焊接变形,防止了焊接过程中因温度变化过大而引起的钢材性能的改变。

The steel structure of Henglong Plaza in Shenyang is the tallest building within the northeast region of China.This structure is 350.6 meters and its total steel usage is 18,000 tones,having characteristics of mass volume,high height and complex structure,etc...Steel Q345C and Q345GJC were adopted in this project,with the maximum thickness of plate being 100mm.In certain parts of this structure,weld joints are intensive and the weight of filler metal is nearly 500 Kg.The project is located in northeast area of China,which has a low-temperature and long-lasting winter.Exactly,the lowest temperature in that district could reach minus 30 degrees Celsius and the winter will last for five months.The inclement climate brought an enormous challenge-welding steel structure in ultra-low temperature environment.In order to construct in winter and guarantee the quality of welded thick steel plate at -30 degrees Celsius,a corresponding construction technology was applied in this case.Additionally,the welding technology and supporting measures are fully capable of meeting the requirement of construction and specifications,resulting in high-efficiency and high-quality welding in low-temperature environment.