从力学角度出发,提出横向超声随焊控制铝合金焊接热裂纹的新方法.讨论了铝合金焊接热裂纹产生的条件,建立脆性温度区间(BTR)金属材料-力学性能匹配模型,采用弹塑性有限元方法对BTR区域金属产生的挤压塑性流变行为和应变场变化进行了分析.模拟结果表明,横向超声冲击对BTR区金属产生横向压缩塑性应变,并依靠BTR区金属的塑性变形把应变传递到焊缝中心,随着横向超声冲击加载功率的增加,在焊缝中心处产生的挤压应变也随之增大.通过实验测定实际情况下BTR区金属的横向压缩塑性应变值,实验结果与模拟结果吻合良好,进一步证明了该方法的可靠性.
A new method was presented from the view of mechanics to prevent welding hot cracking for aluminum alloy by employing transverse ultrasonic during welding.The mechanical condition of welding hot cracking was discussed.The material-mechanical properties matching model within brittle temperature region (BTR) metals was established and the plastic flow and the variation of the strain field in welds by transverse ultrasonic were analyzed numerically.The simulation results show that the transverse ultrasonic impact produces transverse compressive plastic strain in BTR metal,and the plastic deformation is transferred to the weld centre through the metal within BTR.With the ultrasonic load amplitude increasing,the compressive stress in weld centre increases.Experiment was carried out through the ultrasonic extrusion in BTR area.It is indicated that the simulation results and the experiment results are in good accordance,which proves the reliability of the new method.
参考文献
| [1] | 王蕊,梁振新,张建勋.铝合金5A12钨极氩弧焊板外变形的试验研究[J].稀有金属材料与工程,2008(07):1264-1268. |
| [2] | 周广涛,刘雪松,杨建国,闫德俊,方洪渊.预置横向挤压载荷法防止铝合金薄板焊接热裂纹[J].中国有色金属学报,2009(04):613-618. |
| [3] | 方洪渊,董志波,徐文立.随焊锤击防止薄板焊接热裂纹的工艺研究[J].焊接,2002(03):17-20. |
| [4] | 周鹏展,钟掘,贺地求.7A52铝合金厚板搅拌摩擦焊[J].中国有色金属学报,2006(06):964-969. |
| [5] | LIU Gang,WANG Li-liang,YUAN Shi-jian,WANG Zhong-ren.Compressive formability of 7075 aluminum alloy rings under hydrostatic pressure[J].中国有色金属学会会刊（英文版）,2006(05):1103-1109. |
| [6] | LIU Ren-pei,DONG Zu-jue,PAN Yong-ming.Solidification crack susceptibility of aluminum alloy weld metals[J].中国有色金属学会会刊（英文版）,2006(01):110-116. |
| [7] | LI Jing,YIN Yan-sheng,LIU Ying-cai,MA Lai-peng.Fractal analysis of crack paths in Al2O3-TiC-4%Co composites[J].中国有色金属学会会刊（英文版）,2006(04):795-799. |
| [8] | 李军,杨建国,闫德俊,方洪渊.2A12T4铝合金焊接时拘束条件对热裂纹的影响[J].焊接学报,2009(07):69-72. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%