| 任新怀， 卢庆华， 白永真.机械振动对激光填丝焊接接头组织和疲劳性能影响[J].轻工机械,2020,38(3):96-99 |
| 机械振动对激光填丝焊接接头组织和疲劳性能影响 |
| Effect of Mechanical Vibration on Microstructure and Fatigue Properties of Laser Filler Wire Welding Joints |
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| DOI：10.3969/j.issn.1005 2895.2020.03.020 |
| 中文关键词: 激光填丝焊 振动频率 316不锈钢 力学性能 断口形貌 |
| 英文关键词:laser filler wire welding vibration frequency 316 stainless steel mechanical properties fracture morphology |
| 基金项目:国家自然科学基金项目（51605276）。 |
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| 摘要点击次数: 840 |
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| 中文摘要: |
| 针对激光填丝焊接过程中存在气孔、飞溅、夹渣和疲劳性能差等缺点，课题组提出了基于机械振动技术的激光填丝焊接方法。课题组采用机械振动与激光填丝焊接相耦合的方法研究了机械振动对焊缝形貌、组织、力学性能和断裂机理的影响。结果表明：机械振动可以改善316不锈钢焊接接头，减少焊缝中的柱状晶，增加树枝晶和等轴晶，提高了焊缝硬度；3种振动频率下焊接接头的残余应力均较高，与振动频率0和524 Hz相比，1 055 Hz振动频率的焊缝残余应力更低；疲劳断口均呈解理断裂，但是与524 Hz振动频率相比，1 055 Hz振动频率具有更低的裂纹扩展率，更好的疲劳性能。 |
| 英文摘要: |
| Aiming at the shortcomings such as pores, splashes, slag inclusions and poor fatigue performance in laser filler wire welding of the ship and automobile industry, a laser filler wire welding method based on mechanical vibration technology was proposed by the research group. The effect of mechanical vibration on weld morphology, microstructure, mechanical properties and fracture mechanism was studied in test by the method of coupling mechanical vibration and laser filler wire welding. The results show that the mechanical vibration can improve the welded joint of 316 stainless steel, reduce the columnar crystal in the weld, increase the dendrites and equiaxed crystals, and improve the hardness of the weld. The residual stress of the welded joints is higher at the three vibration frequencies, compared with the vibration frequencies of 0 and 524 Hz, the residual stress of the weld at 1 055 Hz vibration frequency is the lowest. The fatigue fractures are all cleavage fractures, but the fracture at 1 055 Hz vibration frequency has narrower fatigue striations, lower crack growth rate and better fatigue performance than the 524 Hz vibration frequency. |
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