研究目的
To study the process of formation of pores (cavities and similar defects) during laser welding of modern structural materials (stainless steels and aluminum alloys) in different weld positions.
研究成果
The weld position during laser welding of stainless steels and aluminum alloys has a crucial effect on the level of quality and formation of defects in welded joints in the form of pores and cavities. The flat and vertical weld positions are the most promising for producing high-quality welded joints of stainless steels. For aluminum AMg6M alloy, the welding process should be carried out in a vertical uphill position to ensure stable formation of a high-quality butt joint and to prevent the failure of laser equipment.
研究不足
The study is limited to the effects of spatial weld position on the formation of pores and cavities in laser welding of stainless steels and aluminum alloys. The findings may not be directly applicable to other materials or welding techniques.
1：Experimental Design and Method Selection:
The investigations of laser welding were performed in a laboratory installation using Nd:YAG-laser ?DY044? of the company ?ROFIN-SINAR? (Germany).
2：Sample Selection and Data Sources:
Weld penetrations were made in the plates of AISI 321 stainless steel and aluminum AMg6M alloy at different angles of inclination α: 90°, 60°; 45°; 30° and 0°.
3：0°.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Nd:YAG-laser ?DY044?, MIM-8 microscope, Wilson Rockwell 4JR Hardness Tester, PMT-3 microhardness tester, MTS 318.25 servo hydraulic testing machine.
4：25 servo hydraulic testing machine.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Welding was produced in uphill and downhill modes at different angles of inclination. The angle of incidence of laser radiation on the plate remained unchanged at different weld positions.
5：Data Analysis Methods:
Metallographic examinations, hardness measurements, microdyrometric analysis, mechanical tests on static tension and bending.
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