气体熔池耦合活性TIG焊熔池N元素分布骤冷分析
Nitrogen distribution in molten pool of gas pool coupled activating TIG welding with rapid cooling method
-
摘要: 采用骤冷法处理不锈钢气体熔池耦合活性TIG焊高温熔池金属,通过控制开始冷却时间,在不影响焊缝成形的前提下,保留N元素在高温熔池内的分布状态,并采用俄歇电子能谱(auger electron spectroscopy, AES)分析了不同位置处N元素的分布规律.结果表明,在熄弧前0.6 s开始冷却时,骤冷效果最好.熔池内N元素沿深度方向整体呈现均匀分布,局部存在较大范围波动;熔池前部和后部边缘位置的氮含量略高于中心位置,熔池中部边缘位置的平均氮含量略低于中心位置;熔池后部总的平均氮含量略高于熔池前部,熔池中部总的平均氮含量介于两者之间.
-
关键词:
- 气体熔池耦合活性TIG焊 /
- 骤冷法 /
- 熔池 /
- N元素 /
- 分布
Abstract: Rapid cooling method is used to cool the high temperature molten pool of gas pool coupled activating TIG welding of stainless steel. By controlling the onset cooling time, the distribution of nitrogen element in molten pool can be retained without affecting the weld appearance. AES is employed to study the nitrogen element distribution in different parts of the molten pool, respectively. The crosssection appearances and metallographic structures of the molten pool metals cool rapidly show that the effect of rapid cooling method is perfect if the molten pool is cooled at 0.6 s before arc being extinguished. The results of the AES analysis indicate that the nitrogen element distributes uniformly as the whole in the depth direction of the molten pool, while fluctuates sharply in local zone. The average nitrogen contents on the boundary zone in the front and tail parts of the molten pool are slightly higher than that in the central zone, while the average nitrogen content on the boundary zone in the middle part of the molten pool is slightly lower than that in the central zone. The overall average nitrogen content of the tail part is slightly higher than that of the front part, and the overall average nitrogen content of the middle part is between both of them. -
-
[1] Gurevich S M, Zamokov V N, Kushirenko N A. Improving the penetration of titanium alloys when they are welded by tungsten arc process[J]. Automatic Welding, 1965, 18(9):1-5. [2] 陆善平,李冬杰,李殿中,等.双层气流保护TIG焊接方法[J].焊接学报, 2010, 31(2):21-24. Lu Shanping, Li Dongjie, Li Dianzhong, et al. Double shielded TIG welding method[J]. Transactions of the China Welding Institution, 2010, 31(2):21-24. [3] 黄勇,刘瑞琳,樊丁,等.气体熔池耦合活性TIG焊方法[J].焊接学报, 2012, 33(9):13-16. Huang Yong, Liu Ruilin, Fan Din, et al. Gas pool coupled activating TIG welding[J]. Transactions of the China Welding Institution, 2012, 33(9):13-16. [4] 黄勇,郝延召,瞿怀宇,等.耦合电弧钨极TIG焊电弧压力的测量与分析[J].焊接学报, 2013, 34(12):33-36. Huang Yong, Hao Yanzhao, Qu Huaiyu, et al. Test and analysis of arc pressure measurement in coupling arc electrode TIG welding[J]. Transactions of the China Welding Institution, 2013, 34(12):33-36. [5] Ma L M, Li Y Y, Liang G J. Effect of hydrogen on 21-7-9 austenitic steel at low temperature[C]//Proceedings of the Seventh International Cryogenic Materials Conference, Advances in Cryogenic Engineering, St. Charles, USA, 1988:325-333. [6] Shankar V, Gill T P S, Manna S L, et al. Solidification cracking in austenitic stainless steel welds[J]. Sadhana-Academy Proceedings in Engineering Sciences, 2003, 28(3):359-382. [7] 黄勇,卢刘杰,樊丁.耦合电弧AA-TIG焊的骤冷效果[J].兰州理工大学学报, 2013, 39(2):17-20. Huang Yong, Lu Liujie, Fan Ding, et al. Research of shock cooling effect of coupled arc AA-TIG welding[J]. Journal of Lanzhou University of Technology, 2013, 39(2):17-20. [8] DebRoy T, David S A. Physical processes in fusion welding[J]. Reviews of Modem Physic, 1995, 67(1):85-112. [9] Palmer T A, DebRoy T. Physical modeling of nitrogen partition between the weld metal and its plasma environment[J]. Welding Journal, 1996, 75(7):195s-207s.
计量
- 文章访问数: 268
- HTML全文浏览量: 10
- PDF下载量: 93
下载:
