研究目的
This work proposed a comparison between laser welding with arc welding (GMAW) and with hybrid laser-arc welding in order to access the microstructures and the mechanical behavior.
研究成果
The laser and hybrid welds are competitive in terms of microstructure and mechanical behavior, presenting both acceptable and tough welds. The maximum ductility of the laser and hybrid welds are very similar, around 14%, and near to the values observed in the base material. The GMAW presents low ductility due to the softening caused by tampering of the martensite, and thus is unacceptable as the welding procedure.
研究不足
The study is limited to the comparison of three welding methods on DP600 steel plates, focusing on microstructure and mechanical behavior. The applicability of the findings to other materials or welding conditions is not addressed.
1：Experimental Design and Method Selection
The study compares three welding methods: GMAW-Gas Metal Arc Welding, laser beam welding (LBW) and hybrid laser welding to access the microstructure and mechanical behavior after the welding of a DP600 steel plate.
2：Sample Selection and Data Sources
The base material is a Dual Phase DP600 sheet with 2.16 mm thickness. Each sheet was electro-sparked machined measuring 100 mm × 200 mm to compose a final welded set measuring 200 mm × 200 mm.
3：List of Experimental Equipment and Materials
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4：Experimental Procedures and Operational Workflow
After welding the samples were cut in transversal section, hot mounted in resin and diamond polished up to 1 μm mesh. The polished surfaces were etched using Nital 2%, cleaned and then analyzed in a Zeiss optical microscope. The hardness testing was carried out using a Vickers Hardness equipment. The tensile mechanical testing used an EMIC equipment with a load cell of 250 kN.
5：Data Analysis Methods
The important parameters to be evaluated are σy: yield strength at 0.2% plastic deformation; σm: maximum tensile strength; εu: uniform strain and εm: maximum strain before failure. For each welding procedure, the temperatures in HAZ were evaluated using Sysweld finite element software.
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YLR-2000 model IPG Photonics laser
YLR-2000
IPG Photonics
Used for laser welding.
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Zeiss optical microscope
Imager2
Zeiss
Used for analyzing the polished surfaces.
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Lincoln Electric arc welder
Idealarc Pulse Power 500
Lincoln Electric
Used for GMAW.
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TRUMPF TruLaser Robot 5020
TruLaser Robot 5020
TRUMPF
Used for hybrid GMAW plus laser welds.
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FutureTech Vickers Hardness equipment
FM 800
FutureTech
Used for hardness testing.
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EMIC equipment
DL 10.000
EMIC
Used for tensile mechanical testing.
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