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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

Active Publication Date: 2011-02-02
沈阳铸研科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The flux used has no refining effect and cannot be used for repair welding of castings to eliminate or reduce pore defects in the welding area

Method used

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  • Method for eliminating aluminum casting repairing welding gas hole defect
  • Method for eliminating aluminum casting repairing welding gas hole defect
  • Method for eliminating aluminum casting repairing welding gas hole defect

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to a method for eliminating air hole defect of overlaying welding for an aluminum casting, which adopts argon tungsten-arc welding with a special argon tungsten-arc welding flux, and technological parameters comprise that : the welding current is between 110 and 380A; the preheating temperature is between 60 and 160 DEG C; the welding speed is between 7 and 25m / h; the diameter of a tungsten electrode phi is between 3.2 and 8.0mm; the diameter of a welding wire is between 1.6 and 6.0mm; and the flow rate of argon is between 14 and 110L / min. The method comprises the following steps: beveling, cleaning a welding zone, and preheating the welding zone; brushing the welding wire to make the welding wire clean; coating the welding flux on a groove face, or simmering one endof the welding wire to dip a proper amount of dry welding flux and immediately implementing welding; and immediately cleaning residues of the flux on the surface of the welding zone by hot water after welding. The method has the advantages that the method adopts the argon tungsten-arc welding and matches the welding flux with the whole set of argon tungsten-arc welding process to eliminate the air hole defect and solve a difficult problem of the overlaying welding for the aluminum casting. The overlaying welding process can eliminate or effectively reduce the air hole defect in the overlayingwelding zone.

Description

technical field [0001] The invention relates to the field of welding, and in particular provides a method for eliminating air hole defects in repair welding of aluminum castings. Background technique [0002] When aluminum castings have casting defects such as shrinkage porosity and pores during the casting process, welding repairs are usually required. Due to the structural limitations of some large or complex castings, or due to misoperation during the casting process, the overall or local gas (hydrogen) content of the casting matrix will be high. During repair welding of such castings, dense linear pores are often produced along the arc surface of the groove of the original substrate, resulting in a very high rejection rate of repair welding of such castings, especially aluminum-silicon alloy castings with a large tendency to absorb air. [0003] The repair welding of aluminum castings generally adopts argon tungsten arc welding and gas metal arc welding. For this kind ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/095B23K9/235B23K35/36
Inventor 冯志军宋国金孙丁益郭祥军
Owner 沈阳铸研科技有限公司
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