Analysis of mechanical properties differences of underwater joints in sea water and fresh water
The under water welding joints of CCSE 40 steel have been achieved by field test with the water depth of 9m using novel developed under water welding electrodes. It is about 20 passes to full fill the welding gap with length of 200mm, width of 7mm and depth of 14mm. The weld formation of each pass is very good. The yield strength is about 424.6 MPa, the tensile strength is about 530.6 MPa, and the elongation is about 10.1％. All the tensile test samples fracture along the fusion line in the WZ. The bending tests show that the face bending is much better than root bending. These are quite different with the results of the joint of fresh water. Through microstructure observation and chemical composition analysis, the reasons of mechanical properties differences are explored.
under water welding wet welding mechanical properties microstructure sea environment
Ning Guo Duo Liu Zhenlin Yang Yanfei Han Jing Zhang Xin Yuan
Shandong Provincial Key Laboratory of Special Welding Technology, Institute of Oceanographic Instrum Shandong Provincial Key Laboratory of Special Welding Technology, Institute of Oceanographic Instrum
国际会议
济南
英文
1-4
2012-08-24（万方平台首次上网日期，不代表论文的发表时间）