摘要
对AZ31镁合金进行了焊接试验,通过PLC控制系统在线控制焊接电流和焊接速度,研究了焊接工艺参数对焊接接头焊缝成形性、力学性能及焊缝区和热影响区显微组织的影响。结果表明,随着焊接电流的上升,焊接接头的抗拉强度与伸长率都表现为先增加而后降低。在焊接电流为140 A时,焊接接头试样取得了最大的抗拉强度和伸长率,分别为240 MPa和11%;随着焊接速度的增大,焊接接头的抗拉强度与伸长率先增加而后降低。当焊接速度为4 mm/s时,抗拉强度与伸长率分别为280 MPa和11%。
AZ31 magnesium alloy was welded by the PLC control system, which online control of welding current and welding speed, the effects of welding parameters on the forming performance of welded joint, mechanical properties and microstructure of weld zone and heat affected zone were studied. The results show that, with the increase of welding current, the tensile strength and elongation of welding joint were increased firstly and then decreased. When the welding current is 140 A, the tensile strength and elongation of the welded joint reached to the largest values, which is 240 MPa and 11% respectively. With the increase of welding speed, the tensile strength and elongation of welding joint were increased firstly and then decreased. When the welding speed is 4 mm/s, the tensile strength and elongation reached to 280 MPa and 11% respectively.
出处
《铸造技术》
CAS
北大核心
2015年第3期751-754,共4页
Foundry Technology
关键词
PLC
焊接
组织
性能
PLC
welding
microstructure
property
