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Microstructure and microhardness of fiber laser butt welded joint of stainless steel plates
Highlights ► Narrow and fully penetrated welded joint without marco-defects is obtained by fiber laser. ► Weld microstructures in fusion zone are mainly columnar dendrites and equiaxed dendrites. ► There are no obvious composition changes and segregation in the fusion zone. ► The welded joint shows higher microhardness than the stainless steel substrate.
Abstract The butt welding of 304 stainless steel plates with thickness of 3mm and 6mm were achieved by YLR-6000 fiber laser under Ar protective gas. The weld appearance, microstructure, composition distribution and microhardness of welded joint were emphatically investigated. The results showed that the narrow and fully penetrated welded joint without marco-defects can be obtained with tightly focused 2kW fiber laser power and 20mm/s welding speed. The weld bead was smooth, and various microstructures typically formed at different zones of the welded joint. The fine columnar and equiaxed crystals existed in the edge and center of weld bead, respectively. Both were different with the microstructure of the stainless steel substrate. However, the composition distribution of the welded joint had no obvious changes. Furthermore, the superior microhardness of welded joint over the stainless steel substrate was mainly attributed to its finer microstructure.
Microstructure and microhardness of fiber laser butt welded joint of stainless steel plates
Highlights ► Narrow and fully penetrated welded joint without marco-defects is obtained by fiber laser. ► Weld microstructures in fusion zone are mainly columnar dendrites and equiaxed dendrites. ► There are no obvious composition changes and segregation in the fusion zone. ► The welded joint shows higher microhardness than the stainless steel substrate.
Abstract The butt welding of 304 stainless steel plates with thickness of 3mm and 6mm were achieved by YLR-6000 fiber laser under Ar protective gas. The weld appearance, microstructure, composition distribution and microhardness of welded joint were emphatically investigated. The results showed that the narrow and fully penetrated welded joint without marco-defects can be obtained with tightly focused 2kW fiber laser power and 20mm/s welding speed. The weld bead was smooth, and various microstructures typically formed at different zones of the welded joint. The fine columnar and equiaxed crystals existed in the edge and center of weld bead, respectively. Both were different with the microstructure of the stainless steel substrate. However, the composition distribution of the welded joint had no obvious changes. Furthermore, the superior microhardness of welded joint over the stainless steel substrate was mainly attributed to its finer microstructure.
Microstructure and microhardness of fiber laser butt welded joint of stainless steel plates
15.02.2013
5 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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