保护气流量对纯镍等离子弧焊接头微观组织的影响

王希靖; 赵青山; 柴廷玺; 景文霞

保护气流量对纯镍等离子弧焊接头微观组织的影响

兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室, 兰州 730050

基金项目: 甘肃省科技支撑计划资助项目（1104GKCA051）

计量
- 文章访问数: 359
- HTML全文浏览量: 3
- PDF下载量: 296
出版历程
- 收稿日期: 2014-10-05

Effects of shielding gas flow on microstructure of PAW welded joints of pure Nickel N6

State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China

摘要

摘要: 对N6纯镍采用不填丝穿孔等离子弧焊方法研究了保护气流量对焊缝微观组织的影响.结果表明，随着保护气流量不断增大，焊缝宏观形貌中的表面缺陷逐渐消失，开始产生明显的金属光泽；焊缝背面的热影响区宽度随保护气流量增加而逐渐增加，并趋近于正面焊缝热影响区宽度.通过对焊缝横截面的微观组织进行观察，发现从母材到焊缝中心晶粒逐渐变大.随着保护气流量的增加，热影响区晶粒尺寸并没有发生明显变化，而焊缝中心处晶粒则是逐渐变大.当保护气不足时，焊缝中出现大量气孔，通过SEM+EDS分析发现，气孔内壁含有大量Ni，C，N，Mg元素为主要成分的氧化物；同时焊缝中发现大量“大脑皮层花纹状”富氧杂质集团.
- 等离子弧焊 /
- 微观组织 /
- 保护气
Abstract: The effect of shielding gas flow (SGF) on weld microstructure was investigated in the plasma arc welding (PAW) of pure N6 Ni without filler wire. The results show that weld appearance has an obvious metallic luster and no surface defects with the increase of the SGF. The HAZ width on the back side of weld seam increases with the SGF rate being increased, and reaches gradually up to that on the front of weld seam. The grains size increase from the base metal to the center of weld. The grain size in HAZ has no few variations with the increase of the SGF, while the grains in the weld center become gradually coarser. Meanwhile, a large number of pores appear when the shielding gas is not enough. From analysis of SEM and EDS results, there are a large number of oxides with Ni, C, N, and Mg as main components in the inner wall of the porosities in weld, and oxygen-riched impurities groups have a texture of cerebral cortex like.
- PAW /
- microstructure /
- shielding gas plow

HTML全文

参考文献(11)

[1]	李春胜, 黄德彬. 金属材料手册[M]. 北京: 化学工业出版社, 2005.
[2]	孙荣禄. 钛-镍-不锈钢接头中元素的扩散及其对性能的影响[J]. 材料科学与工艺,1996, 4(4): 63-67. Sun Ronglu, Elementdiffusion in the joint of Ti-Ni-stainless steel and its influence on the properties of diffusion bonding joint[J]. Material Science & Technology, 1996, 4(4): 63-67.
[3]	孙长余, 郭兴敏, 李菲. 非接触式熔融还原法制备金属镍[J]. 中国有色金属学报, 2010, 20(10): 2045-2050. Sun Changyu, Guo Xingmin, Li Fei. Preparation of nickel by non-contacting smelting reduction method[J]. The Chinese Journal of Nonferrous Metals, 2010, 20(10): 2045-2050.
[4]	游朝文, 余端平. 宽幅N6板材的研制[J]. 甘肃冶金, 2004, 26(3): 27-29. You Chaowen, Yu Duanping. Development of wide N6 sheet[J]. Gansu Metallurgy, 2004, 26(3): 27-29.
[5]	姜家仪, 郑世峰. 纯镍材料焊接工艺优化[J]. 化工建设工程, 2002, 24(5): 45-47. Jiang Jiayi, Zheng Shifeng. Optimization of welding process for pure nickel material[J].Chemical Engineering Construction, 2002, 24(5): 45-47.
[6]	张鹏珍. 纯镍压力管道的焊接及检验[J]. 湖南有色金属, 2009, 25(6): 65-67. Zhang Pengzhen. The pure nickel pressure piping's welding and examination[J]. Hu Nan Nonferrous Metals, 2009, 25(6): 65-67.
[7]	赵威威, 王顺花. 浅析镍及镍合金的焊接方法[J]. 装备制造技术, 2012(9): 237-239. Zhao Weiwei, Wang Shunhua. Analysis of the welding method of nickel and nickel alloy[J]. Equipment Manufactur-ing Technology, 2012(9): 237-239.
[8]	王希靖, 蒋文学, 张昌青. Cr20Ni80合金棒材闪光对焊特性[J]. 兰州理工大学学报, 2011, 37(6): 12-14. Wang Xijing, Jiang Wenxue, Zhang Changqing. Specialities of flash butt welding of Cr20Ni80 alloy bars[J]. Journal of Lanzhou University of Technology, 2011, 37(6): 12-14.
[9]	董春林, 吴林, 邵亦陈. 穿孔等离子弧焊发展历史与现状[J]. 中国机械工程, 2000, 11(5): 577-580. Dong Chunlin, Wu Lin, Shao Yichen. The History and stateoftheart of keyhole mode plasma are welding[J]. China Mechanical Engineering, 2000, 11(5): 577-580.
[10]	O'Brien R L. Weld Hand Book[M]. Miami, Fla: AWS, 1991.
[11]	王希靖, 柴廷玺, 王江, 等. 镍合金N6填丝等离子焊接工艺研究[J]. 热加工工艺, 2013, 23(42): 174-176. Wang Xijing, Chai Tingxi, Wang Jiang, et al. Plasma weldingprocess of nickel alloy N6 with filler wire[J]. Hot Working Technology, 2013, 42(23): 174-176.

施引文献

资源附件(0)

计量

文章访问数: 359
HTML全文浏览量: 3
PDF下载量: 296
被引次数: 0

保护气流量对纯镍等离子弧焊接头微观组织的影响

计量

出版历程

Effects of shielding gas flow on microstructure of PAW welded joints of pure Nickel N6

计量

出版历程

目录