研究目的
Investigating the effects of mechanical vibration on porosity, tensile, and impact properties in laser-arc hybrid welding of high-nitrogen steel.
研究成果
Applying mechanical vibration during the composite welding process can significantly reduce the porosity in the weld. The porosity decreased first and then rose with the increase of vibration frequency. The tensile strength and impact energy increased first and then decreased with the increase of vibration frequency. The fracture surface indicated a ductile fracture. Mechanical vibration refines the weld grains and promotes the escape of bubbles, but excessive vibration frequencies can exacerbate instability in the laser keyhole and pore generation process.
研究不足
The study focused on the effects of mechanical vibration on porosity and mechanical properties in laser-arc hybrid welding of high-nitrogen steel. The limitations include the specific range of vibration frequencies tested and the focus on a single type of steel and welding method.
1：Experimental Design and Method Selection:
The study used a side shaft hybrid welding system composed of an Nd:YAG laser and MIG/MAG welding machine for welding. Mechanical vibration was applied during the welding process to study its effects on weld porosity and nitrogen content.
2：Sample Selection and Data Sources:
The material researched was high-nitrogen steel (HNS), with austenitic stainless steel (ASS) filler wire used. The chemical compositions of HNS and the filler wires were listed.
3：List of Experimental Equipment and Materials:
Nd:YAG laser (Model HL4006D by TRUMPF), MIG/MAG welding machine (Model YD-350A G2HGE by Panasonic), shielding gas (5% CO2 + 95% Ar), and ASS filler wire with a diameter of 1.2 mm.
4：2 mm.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The welding parameters included laser power, welding voltage, welding current, welding speed, and vibration frequency. The specimens were prepared by removing oxide scales before welding and cutting into metallographic specimens after welding.
5：Data Analysis Methods:
The porosity defects were detected by X-ray nondestructive testing, and the image of the porosity morphology was extracted by MATLAB software. The microstructure was analysed using an optical microscope, and the fracture morphology was observed by a scanning electron microscope. The nitrogen content was analysed using an oxygen and nitrogen analyzer.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
