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| GH4145激光点焊工艺及接头性能研究 |
| Microlaser Spot Welding Technology and Joint Performance |
| Received:July 10, 2018 Revised:September 10, 2018 |
| DOI：10.3969/j.issn.1674-6457.2018.05.003 |
| 中文关键词: GH4145 激光点焊 物理性能 显微组织 |
| 英文关键词: GH4145 laser spot welding physical properties micro-structure |
| 基金项目:国家自然科学基金（51565040）；江西省教育厅科技落地计划（科学前沿）（KJLD14055）；江西省科技计划（20151BBE50034，20133BBE50021） |
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| 中文摘要: |
| 目的 研究不同工艺参数下高温合金的微激光点焊接头性能。方法 利用Nd: YAG激光器对厚度为0.23 mm和0.13 mm的GH4145进行搭接点焊，利用微型拉伸机、金相显微镜、硬度计对接头的物理性能进行测试，并观察组织结构。结果 脉宽长度为6.0 ms，输出功率百分比为20%（输出功率16 W）时，最大拉伸剪切力为178.59 N，靠近焊点中心位置两边测试点硬度分别达到HV517和HV506。结论 接头表面熔化尺寸、焊接接头的拉伸剪切力和硬度随着激光功率的增大而增大，增大到一定值时停止变化，不同参数下达到不同的最大值，组织无明显规律变化。近表面处出现等轴晶，表面以下至熔合线的显微组织为树状晶。通过激光搭接点焊将两片GH4145连接，接头处拉伸剪切力、硬度均低于母材，功率增大有助于提高接头的抗拉强度。 |
| 英文摘要: |
| The paper aims to study micro-laser spot welding performance of high-temperature alloys under different process parameters. The 0.23 mm and 0.13 mm thick GH4145 were spot welded with a Nd: YAG laser. Physical properties of the joints were tested with a micro-stretcher, a metallographic microscope, and a hardness tester; and their microstructures were observed. When the pulse width length was 6.0 ms and the percentage of output power was 20% (16 W), the maximum tensile shear force was 178.59 N. The hardness of the test points on both sides near the center of the welding spot was HV517 and HV506 respectively. The joint surface melting size, tensile shear force and hardness of the welded joint increase with the increase of the laser power, but it becomes sluggish when the value increases to a certain value. Different parameters lead to different maximum value. The organization does not change significantly. Equiaxed grains appear at the near surface. Dendritic crystal appears between the surface and the fusion line. Two pieces of GH4145 are connected by laser lap welding. The shear force and hardness of the joints are lower than that of the base metal. The increase of power helps to improve the physical properties of the joints. |
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