Hot cracking during laser welding of steel: influence of the welding parameters and prevention of cracks
Hot cracking during laser welding of steel: influence of the welding parameters and prevention of cracks
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DOI：
10.1117/12.2254424
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发表时间：
2017-02
期刊：
影响因子：
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通讯作者：
M. Schaefer;Steffen Kessler;P. Scheible;N. Speker;T. Harrer
中科院分区：
文献类型：
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作者：
M. Schaefer;Steffen Kessler;P. Scheible;N. Speker;T. Harrer
高强度钢合金的连续波小孔模式激光焊接会产生热裂纹。热裂纹敏感性取决于焊接工艺参数、合金成分和焊接夹具等因素的相互作用。在本文中，我们专注于焊接参数的影响，并研究了激光功率，焊接速度和激光波长对裂纹形成的依赖性。X射线图像用于可视化热裂纹图案，其表现出明显的周期性。为了影响热裂纹的形成，对输入到过程中的入射能量进行了调整。对于特定的焊接参数，我们展示了通过使用双点光学器件来防止热裂纹的示例。
In continuous wave keyhole-mode laser welding of high strength steel alloys hot cracking can occur. The hot crack susceptibility depends on the mutual interaction of several factors like the welding parameters, the alloy composition and the weld fixturing. In this paper we focus on the influence of the welding parameters and investigate the dependency of the laser power, the welding speed and the laser wavelength on the crack formation. X-ray images are used to visualize the hot crack patterns, which exhibit a pronounced periodicity. To influence the hot crack formation, the incident energy input into the process was adapted. For specific welding parameters, we show exemplarily the prevention of hot cracking by the use of a twin-spot optics.