GH3039脉冲激光焊接头组织性能研究

采用脉冲激光焊接工艺对GH3039镍基高温合金进行实验研究。焊接工艺参数选择适当时,可以获得较好的焊接接头。试验接头参数为:工作电流240 A,脉宽6 ms,频率14 Hz,焊接速度105 mm/min,离焦量3 mm,气流量3 L/min。通过硬度测定,金相观察,拉伸试验对焊缝组织和形貌进行观察和分析。结果表明,焊缝组织主要为奥氏体基体,中心区域为细小的等轴晶,边缘为柱状晶,焊缝中心的硬度高于母材硬度,焊缝组织中的层状形貌是由脉冲激光间断作用形成。

Microstructure and properties of the pulse laser welded joint of GH3039

The GH3039 nickel-based superalloy was experimentally studied by pulse laser welding process.Good welded joints can be obtained by using appropriate processing parameters.The parameters are:working current I=240 A,pulse width w=6 ms,frequency f=14 Hz,welding speed v=105 mm/min,defocusing distance F=3 mm,air flow h=3 L/min.The microstructures were observed by optical microscopy and the properties were analyzed by tensile test,hardness measurement.The results show that the microstructure of the welded joint m...