A method for reducing pores in aluminum alloy arc fuse additive manufacturing
An additive manufacturing, aluminum alloy technology, applied in the field of reducing the pores of aluminum alloy arc fuse additive manufacturing, can solve the problems of increasing wire cost, reducing aluminum alloy porosity, increasing equipment cost, etc., to reduce heat input, porosity, etc. The effect of improving defects and ensuring stacking efficiency
Active Publication Date: 2021-07-27
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology
The aluminum alloy powder core wire used in arc fuse additive manufacturing can reduce the porosity of aluminum alloy and avoid hydrogen embrittlement caused by hydrogen, but the aluminum alloy powder core wire for arc welding additive manufacturing can be used in different types of aluminum alloy In the process of fused wire additive manufacturing, it needs to be remanufactured, which increases the cost of wire
[0005] Chinese patent application number: 201811034141.X titled "Aluminum alloy laser-double pulse MIG composite heat source arc additive manufacturing method and workpiece" proposes an aluminum alloy laser-double pulse MIG composite heat source arc additive manufacturing method, which combines low power Combining pulse laser and double pulse MIG arc, it has the characteristics of both laser welding and arc welding, which can effectively reduce or even eliminate the pore defects of aluminum alloy samples, but this process significantly increases the cost of equipment by introducing laser equipment
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[0035] A method for reducing air holes in aluminum alloy arc fuse additive manufacturing, comprising the following steps:
[0036] Step 1: If figure 1 As shown, connect the negative output terminal of the GMA main circuit power supply 2 of the constant voltage source to the substrate 6, connect the positive terminal of the GMA main circuit power supply 2 to the GMA wire feeder 1, and connect the positive output terminals of the N auxiliary power supplies 4 through N lines respectively. The cable is connected to the positive pole of the GMA main power supply 2, and the value range of N is 1-4; N auxiliary guns 5 and GMA gun 3 form an inverted cone in space, and the axis of the GMA gun 3 as the cone is vertical On the substrate 6, N auxiliary guns 5 are evenly distributed along the generatrix of the cone, and the ends of the N auxiliary guns 5 and the GMA gun 3 intersect at the apex of the cone along the direction of the extension line; the GMA gun 3, the substrate 6 and the N a...
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The invention provides a method for reducing air holes in aluminum alloy arc fuse additive manufacturing. A coupling arc is generated between the base plate and N auxiliary guns, and the auxiliary power supply is used to extract part of the fuse current to reduce the heat input of the accumulation layer; set the process parameters of the arc fuse additive manufacturing process and the total auxiliary current I p The ratio to the total current I; repeat the above steps until the forming of the aluminum alloy member is completed. The present invention regulates the total auxiliary current I p The ratio to the total current I can reduce the porosity defects in the additive manufacturing of aluminum alloy arc fuses. On the basis of maintaining high accumulation efficiency and low equipment cost, it can effectively reduce the heat input of the accumulation layer and reduce the weight of the previous accumulation layer. The melting area can significantly reduce the nucleation particles of pores, thereby effectively improving the pore defects in aluminum alloys.
Description
technical field [0001] The invention belongs to the technical field of additive manufacturing of metal components, and in particular relates to a method for reducing pores in the additive manufacturing of aluminum alloy arc fuses. Background technique [0002] Aluminum alloy has the advantages of low density, high strength, good plasticity, and good corrosion resistance, so it is widely used in various fields. Compared with traditional casting, forging and other methods that require further machining to prepare aluminum alloy components, arc fuse additive manufacturing has the characteristics of high material utilization, high stacking efficiency, low equipment cost and environmental friendliness. However, serious porosity defects exist in aluminum alloys prepared by the arc-fuse additive manufacturing process. Pores reduce the load-bearing area of aluminum alloy components, resulting in a decrease in the performance of aluminum alloys. Pore defects in aluminum alloys ...
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IPC IPC(8): B23K9/04
CPCB23K9/04
Inventor 熊俊施孟含刘广超陈辉
Owner SOUTHWEST JIAOTONG UNIV