- 标题
- 摘要
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Magnetic-Field-Induced Partial-to-Full Penetration Evolution and Its Mechanism During Laser Welding
摘要： The geometry and tensile strength of magnetic-?eld-assisted laser-welded Ti-6Al-4V joints have been studied. Due to the effects of the magnetic ?eld on the melt ?ow behavior during welding, the weld penetration depth increased from 4.27 mm (partial penetration) to 5.00 mm (full penetration) and the curvature of the weld cross-section decreased, improving the weld tensile strength. The fusion zone was enlarged, showing a maximum increase of 53.4% in area when the magnetic ?eld intensity was 90 mT. The increased penetration depth and fusion zone area suggest that application of a magnetic ?eld can improve the energy utilization of the laser during laser butt welding. The mechanism of the magnetic-?eld-induced penetration depth evolution is discussed. This study provides a new energy-saving method to obtain a full-penetration weld using laser welding at lower power.
关键词： Magnetic-field-assisted laser welding,Tensile strength,Energy utilization,Ti-6Al-4V,Weld geometry
更新于2025-11-28 14:24:20
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Life cycle analysis for laser welding of alloys
摘要： Laser welding of AISI 304, Ti6Al4V, and Inconel 625 alloy was realized. The topological and metallurgical variations in the welded region are presented brie?y and life cycle analysis for the welding process due to each alloy is introduced. The analytical tools including optical and scanning electron microscopes are used to characterize the weld sections. The energy consumption during welding and the size of the welded sections are formulated using the lump parameter analysis. The energy consumption during welding and the geometric features of the weld sites is measured. The ?ndings are compared with those obtained from the lump parameter analysis. It is found that the energy consumption predicted and obtained from the measurements are in good agreement for the welding of each material. The prediction of the weld width from the lump parameter analysis di?ers from that of the measurements; however, the di?erences are within the acceptable limits. Because of the high pressure assisting gas e?ect and the local evaporation from the weld surface, some material is ablated from the top surface of the weld site. The gravitational and the surface tension forces result in the molten material extension from the bottom side of the welded zone. The laser welding of Inconel 625 alloy has the most contribution towards environmental destruction as compared to those of other materials welded. Consequently, the materials selection for the laser welding remains crucial for minimizing the environmental impact.
关键词： Energy consumption,Laser welding,Weld geometry,Life cycle analysis
更新于2025-09-16 10:30:52
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Towards monitoring laser welding process via a coaxial pyrometer
摘要： The sensing and controlling of weld metrics, such as weld bead width, depth of penetration and defects, are important for adopting laser welding technology into the industry to meet the increasing demands on product quality. In this research, a weld monitoring system for laser welding is designed using a coaxial infrared pyrometer. Welds with different geometries are induced by stepwise modulation of laser power in bead-on-plate welds at three different beam diameters. The temperature signal calculated from coaxial infrared radiation are successfully correlated to weld width and penetration depth, measured by cross-sectional optical microscopy. Moreover, the temperature signal can be used as a direct indicator of welding transition mode between conduction and keyhole. The monitor is also capable of tracking geometric defects during laser welding. The use of coaxial infrared radiation can be a promising tool for the on-line detection and control of weld metrics, hence, to improve weld quality.
关键词： Laser welding,Pyrometer,Weld geometry,Coaxial monitoring
更新于2025-09-16 10:30:52