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。
Sealing side welding parameters of 6061 aluminum alloy and 316 L stainless steel welded by Nd ： YAG la- ser were optimized, and welding cracks, intermetallic compounds, microhardness and fracture morphology were ob- served 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 HvT01 ;the forms of the intermetallic compounds which mainly distributed in near the fusion line are nubby and acicu- lar, and its iron contents decreases with the increase of the depth of fusion. Fracture mode shows the brittle character- istics with some local areas of plastic fracture in shear experiment.
出处
《激光与红外》
CAS
CSCD
北大核心
2017年第5期527-533,共7页
Laser & Infrared
基金
国家自然科学基金(No.51265035)
江西省自然科学基金(No.2015BAB206042)
江西省教育厅重点项目(No.GJJJ500020)资助
关键词
YAG激光焊
裂纹
金属间化合物
断口形貌
YAG laser welding
crack
intermetallic compounds
fracture morphology
