• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Sheet metal 2011 >The Low-cycle Fatigue Strength of Laser-welded Ultra-high-strength Steel
【24h】

The Low-cycle Fatigue Strength of Laser-welded Ultra-high-strength Steel

机译：激光焊接超高强度钢的低周疲劳强度

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Ultra-high-strength (UHS) steels are used in booms, transport vehicles and other light weight structures. It is well-known that it is possible to achieve a strong weld statically, as the base material, by using laser welding as a weld method [1]. The design strength of the light weight structure is often rather high. In the case of booms and transport vehicles, there can be very high dynamic forces in the structure. Therefore it is necessary to study how much fatigue stress the weld seam can resist and at the same time find the optimal welding parameters. The 4 mm bainitic-martensitic UHS steel was welded with laser without filler material to lasercut seam edges by using different weld parameters. Argon gas was blown by pipe on coaxial nozzle near the key hole and through a 60 mm gas nozzle after the keyhole. Also, the root side of the weld was shielded with argon. The welds were tested by using the bending fatigue test. The test stresses were 800 MPa and 700 MPa. The fatigue strength results showed that with the laser welded seams, the number of cycles was about three times lower than with the base material. The fatigue strength was slightly better in welds which were welded with lower energy input. In the case of the weld seam welded with lowest energy input by using 300 mm optics, there was some incomplete penetration due to excessively high surface roughness at the weld seam edges.
机译：超高强度（UHS）钢用于动臂，运输车辆和其他轻型结构。众所周知，通过使用激光焊接作为焊接方法[1]，可以静态地牢固地焊接作为基材。轻质结构的设计强度通常很高。对于动臂和运输车辆，结构中可能会有很高的动力。因此，有必要研究焊缝能承受多少疲劳应力，同时找到最佳的焊接参数。通过使用不带填充材料的激光将4 mm贝氏体-马氏体UHS钢焊接在一起，通过使用不同的焊接参数对接缝边缘进行激光切割。将氩气通过管道吹到键孔附近的同轴喷嘴上，并通过键孔后的60 mm气体喷嘴吹入。同样，焊缝的根部也用氩气保护。通过使用弯曲疲劳试验来测试焊缝。测试应力为800 MPa和700 MPa。疲劳强度结果表明，采用激光焊接的接缝的循环次数比使用母材的循环次数少约三倍。在能量输入较低的情况下，其疲劳强度稍好一些。对于使用300 mm光学元件以最低能量输入进行焊接的焊缝，由于焊缝边缘处的表面粗糙度过高，导致焊缝未完全熔透。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号