Tailored blank laser welding method for hot-formed steel with Al-Si plating
A hot-forming steel and hot-forming technology, applied in laser welding equipment, welding medium, welding equipment, etc., can solve problems such as increased production costs, achieve the effects of improving production efficiency, reducing production costs, and simple methods
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Embodiment 1
[0048] Clean the surface of the hot-formed steel with Al-Si coating, the thickness is 1.2mm, and the structure inside the steel plate is martensite; put the welding test plate flat on the welding test bench, and fix the sample with a welding fixture to ensure that the joint The group pair gap is 0.1~0.3mm;
[0049] Use a 6kW fiber laser to tailor the test plate, the spot diameter is 0.5mm, the welding speed is 2.0m / min, the laser power is 3.5kW, and the shielding gas is 85% N 2 +15%O 2 , The gas flow rate is 10L / min. No welding wire is added for welding.
[0050] After welding, the macroscopic appearance of the weld seam is excellent, without obvious spatter, and it is a full penetration weld seam. The tensile fracture position appears in the base metal area, and the microstructure of the weld area is lath martensite. The cold bending performance of the weld zone meets the requirements.
[0051] According to the measurement method described in the present invention, the pr...
Embodiment 2
[0053] Clean the surface of the hot-formed steel with Al-Si coating. The thickness is 1.5mm. The internal structure of the steel plate is lath martensite; the welding test plate is placed on the welding test bench, and the sample is fixed with a welding fixture to ensure The pair gap at the butt joint is 0.3-0.4mm; IPG 6kW fiber laser is used for tailor welding of the test plate, the spot diameter is 0.3mm, the welding speed is 3.0m / min, the laser power is 4.0kW, and the shielding gas is 90% N 2 +10%CO 2 , the gas flow rate is 13L / min, no welding wire is added for welding.
[0054] After welding, the macroscopic appearance of the weld seam is excellent, without obvious spatter, and it is a full penetration weld seam. The tensile fracture position appears in the base metal area, and there is no obvious softening in the weld. The microstructure in the weld is lath martensite, and there is no high-temperature ferrite.
[0055] According to the measurement method described in th...
Embodiment 3
[0057] Clean the surface of the hot-formed steel with Al-Si coating, the thickness is 1.2mm, and the structure inside the steel plate is martensite; put the welding test plate flat on the welding test bench, and fix the sample with a welding fixture to ensure that the joint The group pair gap is 0.1~0.3mm;
[0058] A 6kW fiber laser is used for tailor welding of the test plate, the spot diameter is 0.5mm, the welding speed is 2.0m / min, the laser power is 3.5kW, the shielding gas is air, the gas flow rate is 15L / min, and no welding wire is added for welding.
[0059] After welding, the macroscopic appearance of the weld seam is excellent, without obvious spatter, and it is a full penetration weld seam. The tensile fracture position appears in the base metal area, and the microstructure of the weld area is lath martensite. The cold bending performance of the weld zone meets the requirements.
[0060] According to the measurement method described in the present invention, the p...
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