2507超级双相不锈钢激光焊接技术
毕业论文关键词：SAF2507；激光焊；离焦量；耐点蚀
Abstract 2507 super duplex stainless steel is widely used. It has the resistance to pitting corrosion, corrosion resistance of the performance is very good, at the same time it also has high strength, high fatigue strength. Laser welding of 2507 super duplex stainless steel was studied in this paper. The effects of the amount of out of focus, laser power and welding speed on the microstructure and mechanical properties of welding joint were analyzed. Away from the focus, laser power and welding speed has a significant effect on the 2507 super duplex stainless steel weld performance, keep the welding speed and laser power must, when the defocusing amount is positive, seam weld width and penetration depth is smaller; defocusing amount is negative, weld penetration weld width value is larger. Only change the laser power, with the increase of the laser power, the weld width and depth of the weld is also increased. The laser power is maintained at around 2500W, and the formation of the weld is better. When other conditions are certain, the welding speed increases, the weld width of the weld is gradually reduced.. In the 2507 super duplex stainless steel laser welding, select the appropriate welding parameters and the amount of out of focus, can be the ideal weld forming and joint performance. Under the condition of 0, the laser power is 2500W, the welding speed is 20 -25mm/s, the SAF2507 laser welding of thick 5mm can get the uniform and continuous, good shape and high hardness. The hardness of weld zone and heat affected zone is higher than that of base metal, because of the influence of heat affected zone and heat affected zone, the content of ferrite increases, and the hardness increases. The laser power and welding speed have significant influence on the pitting corrosion resistance of the welded joint. With the increase of laser power, the pitting corrosion resistance of the welded joint is increased, and the pitting corrosion resistance of the weld is also increased with the increase of the welding speed
Keywords: SAF2507; laser welding; out of focus; pitting corrosion
目录
第一章绪论..1
1.1双相不锈钢的概述1
1.1.1双相不锈钢的耐腐性1
1.1.2双相不锈钢的焊接性3
1.1.3SAF2507的力学性能.3
1.2激光焊的概述..4
1.2.1激光焊接的特点和应用..4
1.2.2双相不锈钢激光焊研究进展.6
1.3选题意义及研究内容..7
1.3.1选题意义..7