欧标大直径圆钢对接全熔透焊接工艺及其应用

Research and application of full penetration butt welding process on European-standard large-diameter round bar

港珠澳大桥香港口岸旅检大楼项目钢结构工程采用材质为EN 10025-3 S355NL、直径φ110 mm的大直径圆钢。压力电阻焊、搭接焊和螺纹套筒均无法满足工程构件接长要求。研究欧标细晶粒结构钢大直径圆钢全熔透焊接工艺,包括焊接工艺评定、原材料、焊接材料、坡口、焊接工艺参数、焊接顺序、检测等。实践证明,制定的工艺规程满足欧标细晶粒结构钢大直径圆钢在建筑钢结构项目上的应用,达到预期效果。

The round bar with outside diameter 110 mm and metal grade S355NL of EN 10025-3 is applied in structural steelwork of Hong Kong-Zhu Hal-Macao Bridge Boundary Crossing Facilities Passenger Clearance Building project. The methods of resistance welding,lap welding and threaded sleeve can＇t meet the requirement for connection extension. In this paper,the research of full penetration butt welding process on fine grained structural steel of European-standard large-diameter round bar is introduced, including welding procedure qualification,parent metal,welding consumables,groove,welding parameter,welding sequence and arrangement of runs and testing. Based on the qualified welding procedure specification ,appropriate work instructions are prepared for this project. The results show that application of fine grained structural steel of European-standard large-diameter round bar in steel building structure has been solved and achieved the desired effect.