Method for eliminating aluminum casting repairing welding gas hole defect
A technology for aluminum castings and defects, which is applied in the field of eliminating air hole defects in aluminum casting repair welding, can solve the problems that flux cannot be refined and cannot be used, and achieves the effect of eliminating air hole defects and ensuring quality
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Embodiment 1
[0018] An aluminum alloy cabin casting, the material is ZL114A, the wall thickness of the repair welding part is 17mm, and the groove size is 40×30×10mm. Firstly, normal argon arc welding was adopted without flux, and X-ray flaw detection showed that there were large dense linear pores along the arc surface of the groove of the original substrate. The repair adopts the inventive process, and the specific operation is: re-open the groove in the original repair welding area, and remove the linear air hole defects. Clean the groove with acetone, free of dirt and oil, heat the repair welding part of the casting locally, keep it at 60-80°C, use a welding wire with a diameter of Φ1.6mm, heat the end of the welding wire, dip it in dry flux, and perform repair welding , Welding current: 110-160A, welding speed: 20-25m / h, tungsten electrode diameter: Φ3.2mm, argon gas flow: 14-20L / min, repair welding is completed in three layers. After welding, there is no linear porosity in the repai...
Embodiment 2
[0020] An aluminum alloy shell casting, the material is ZL205A, the wall thickness of the repair welding part is 40mm, and the groove size is 65×45×25mm. As in Example 1, normal argon arc welding is first used without flux, and X-ray flaw detection shows that there are large dense linear pores along the arc surface of the groove of the original substrate. The repair adopts the inventive process, and the specific operation is: re-open the groove in the original repair welding area, and remove the linear air hole defects. Clean the groove with acetone, free of dirt and oil, heat the repair welding part of the casting locally, keep it at 90-110°C, use a welding wire with a diameter of Φ3mm, heat the end of the welding wire, dip the dry flux, perform repair welding, and weld Current: 200-250A, welding speed: 15-18m / h, tungsten electrode diameter: Φ4.8mm, argon gas flow: 24-28L / min, repair welding is completed in three layers. After welding, there is no linear porosity in the repa...
Embodiment 3
[0022] An aluminum alloy shell casting, the material is ZL114A, the wall thickness of the repair welding part is 60mm, and the groove size is 55×35×32mm. As in Example 1, normal argon arc welding is first used without flux, and X-ray flaw detection shows that there are large dense linear pores along the arc surface of the groove of the original substrate. The repair adopts the inventive process, and the specific operation is: re-open the groove in the original repair welding area, and remove the linear air hole defects. Clean the groove with acetone, free of dirt and oil, heat the repair welding part of the casting locally, keep it at 120-140°C, use a welding wire with a diameter of Φ4mm, heat the end of the welding wire, dip the dry flux, perform repair welding, and weld Current: 270-320A, welding speed: 12-15m / h, tungsten electrode diameter: Φ4.8mm, argon gas flow: 80-90L / min, repair welding is completed in three layers. After welding, there is no linear porosity in the rep...
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