根据等离子弧焊接特点,利用双椭球体热源模型,对焊接温度场进行分析并建立三维熔池模型.以0Hz时超声电弧焊接熔池为对象,在最佳空化频率范围内,通过模态分析求解一阶谐振频率,并将与之对应的熔池响应情况进行预测.最后,通过分别施加不同大小的超声电弧频率,以三组2mm厚MGH956合金板作为实验材料进行平板对接焊试验.结果显示,接头横断面熔合线计算几何尺寸与尺寸符合良好.在谐振条件下,焊缝区面积增大,组织的细化效果较好,气孔率低,同时焊缝区软化现象得到显著改善.利用计算机模拟的方法基本达到了超声电弧频率优化的目的.
参考文献
| [1] | 美国金属学会;韩凤麟.金属手册:第七卷粉末冶金[M].北京:机械工业出版社,1994 |
| [2] | 杨峥,田耘,柳光祖.MGH956合金冷轧薄板粗大再结晶晶粒形成机理[J].材料热处理学报,2010(05):1-4. |
| [3] | MIODOWNIK M A;MARTIN J W;LITTLE E A .Secondary recrystallisation of two oxide disperrion strengthened ferritic superalloys MA956 and MA957[J].Materials Science and Technology,1994,10(02):102-109. |
| [4] | KELLY T J.Joining mechanical alloys for fabrication[A].London:IncoMap,1983:129-138. |
| [5] | FLOREEN S;KANE R H;KELLY T J.An evaluation of Incoloy alloy MA 956 for a high temperature heat exchanger application[A].New York:IncoMap,1981:94-99. |
| [6] | POTTER W A.Fusion welding of incoloy alloy MA 956[A].New York:IncoMap,1981:120-120. |
| [7] | 吴敏生,何龙标,李路明,郝红伟.电弧超声焊接技术[J].焊接学报,2005(06):40-44,53. |
| [8] | 张春雷,吴敏生,杜敬磊.Improving Weld Quality by Arc-Excited Ultrasonic Treatment[J].清华大学学报(英文版),2001(05):475-478. |
| [9] | Y.-C. Lei;H.-L. Xue;W.-X. Hu .Effects of ac arc ultrasonic on plasma arc in situ welding of SiCp/6061Al MMCs[J].Science and Technology of Welding and Joining,2011(6):561-566. |
| [10] | GOLDAK J;CHAKRAVARTI A;BIBBY M .A new finite element model for welding heat sources[J].Metallurgical and Materials Transactions B:Process Metallurgy and Materials Processing Science,1984,15(06):299-305. |
| [11] | MOLIAN PA;YANG Y M;PATNAIKPC .Laser welding of oxide dispersion-strengthened alloy MA754[J].Journal of Materials Science,1992,27:2687-2694. |
| [12] | 田耘,郭万林,杨峥,淮军锋,柳光祖,李文林,李帅华.MGH956合金板材电子束焊和氩弧焊的接头组织与性能研究[J].航空材料学报,2011(04):33-38. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%