铝/钢Nd∶YAG激光封边焊接头力学性能及界面组织
Mechanical properties and interfacial structure of aluminum/steel alloy welding joint by Nd∶YAG laser sealing side
陈从胜 1李鹤 1杨瑾 1李玉龙1
作者信息
- 1. 南昌大学机电工程学院江西省机器人及焊接自动化重点实验室,江西 南昌 330031
- 折叠
摘要
对316 L不锈钢和6061铝合金进行了Nd∶YAG激光封边焊接,优化了焊接工艺参数,观察分析了接头裂纹、金属间化合物、显微硬度及拉剪断口形貌.结果表明:当焊接电流为110 A,脉宽4 ms,频率10 Hz,焊接速度200 mm/min时,接头质量较好,单位长度最大抗拉剪力为19.79 N/mm.熔合线附近裂纹两侧硬度较高,最大硬度达到Hv701;金属间化合物存在块状和针状两种形式,主要分布于熔合线附近,其铁元素含量随熔深的增加而逐渐减小.拉剪实验中,接头断裂形式为脆性断裂,局部表现出塑性断裂特征.
Abstract
Sealing side welding parameters of 6061 aluminum alloy and 316 L stainless steel welded by Nd∶YAG laser were optimized,and welding cracks,intermetallic compounds,microhardness and fracture morphology were observed and analyzed. Results show that the quality of welding joint is good when welding current is 110 A,laser pulse width is 4 ms,laser frequency is 16 Hz,welding speed is 200 mm/min,and the maximum shear force per unit length is 19.79 N/mm. The field near the crack has higher vickers hardness than other areas,and the maximum hardness is Hv701;the forms of the intermetallic compounds which mainly distributed in near the fusion line are nubby and acicular,and its iron contents decreases with the increase of the depth of fusion. Fracture mode shows the brittle characteristics with some local areas of plastic fracture in shear experiment.
关键词
YAG激光焊/裂纹/金属间化合物/断口形貌Key words
YAG laser welding/crack/intermetallic compounds/fracture morphology引用本文复制引用
基金项目
国家自然科学基金(51265035)
江西省自然科学基金(2015BAB206042)
江西省教育厅重点项目(GJJJ500020)
出版年
2017
NETL
NSTL
维普
万方数据