Questions and answers about aluminum alloy porosity

• How to repair defects such as air holes in aluminum alloy castings?

  It can be welded by burning aluminum

  Engineering Technology Science

  1 answer

• How to solve the air outlet of aluminum alloy welding?

  Because of the fast heat dissipation capacity of aluminum, when welding parts, the heat dissipates quickly, and the molten pool begins to solidify, but the bubbles have not yet surfaced, resulting in a large number of pores inside. When welding, be careful not to weld too high each time.

  Engineering Technology Science

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• How to solve the problem of aluminum alloy welding porosity?

  Different aluminum alloys produce different types of pores. It is generally believed that the aluminum alloy produces the following types of pores during welding: hydrogen and pores. After the aluminum alloy is melted in the hydrogen environment, its internal hydrogen content can reach more than 0.69ml/100g. However, after solidification, its hydrogen dissolving capacity in equilibrium state is only 0.036ml/100g at most, which is nearly 20 times the difference. Therefore, in the process of transformation from liquid to solid, liquid aluminum

  Engineering Technology Science

  1 answer

• What are the types of air holes in aluminum alloy castings?

  Due to the serious oxidation and gas absorption tendency of aluminum alloy, and the direct contact with furnace gas or the outside atmosphere during the smelting process, if the control is slightly improper during the smelting process, aluminum alloy will easily absorb gas and form pores, most commonly pinholes. Gas porosity/pin hole usually refers to precipitation pores less than 1mm in the casting, which are mostly circular and unevenly distributed on the whole section of the casting, especially in the

  Vocational training

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• How to repair defects such as air holes in aluminum alloy castings?

  If electric welding, argon welding and other equipment are used for repair, it is easy to produce side effects such as thermal deformation due to large heat release, which cannot meet the requirements for repair welding. The cold welding repair machine is used to repair casting defects based on the principle of instantaneous discharge of high-frequency electric spark and heatless surfacing. Due to the small heat affected area of cold welding, it will not cause annealing deformation of the base material, crack, hard spot and hardening. Moreover, the welding strength is high, and the re solidification of the filler and the substrate after melting at the same time is firm, which can be ground, milled and filed

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• What are the effects of porosity on the properties of aluminum alloy castings?

  The effect of pinhole on the properties of aluminum alloy is mainly manifested in the reduction of the density of the casting structure and the mechanical properties. Therefore, in the production practice of aluminum alloy castings, it is very important to strengthen the research on the influence of porosity grade on mechanical properties, and ensure the quality of aluminum alloy castings by controlling the pinhole grade. Pinhole grade evaluation and low magnification inspection shall be conducted according to GB10851-89, and in case of dispute, the provisions in Table 2 shall be followed; X-ray radiography shall be carried out according to GB11346-89 Aluminum

  Vocational training

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• Porosity of Aluminum Alloy Sand Casting

  Ni tries to add Al Zr master alloy into the alloy liquid, which plays the role of exhaust and grain refinement The sand mold is still necessary to make air holes. In the modification treatment, the amount of modification should be about 2% of the weight of the alloy liquid,

  Engineering Technology Science

  1 answer

• What are the main reasons for porosity when welding aluminum and aluminum alloy?

  Hydrogen is the main reason for porosity during welding of aluminum and aluminum alloy. Since liquid aluminum can dissolve a large amount of hydrogen, while solid aluminum can hardly dissolve hydrogen, when the temperature of molten pool cools and solidifies rapidly, hydrogen cannot escape in time, and it is easy to accumulate in the weld to form porosity

  Chemistry

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• Paper on Aluminum Alloy Casting

  Reference paper website: 3. Technician Thesis Network 3. Technician Thesis Network 4. Thesis overview of China Gardener Network 5. Articles by teachers of the primary school attached to Peking University: 3、 Professional 1. Excellent paper journal Mainly science and technology. 2. Thesis Information Network Mainly financial and economic management. 3. Law Library The article is just like its name. 4. Law Thesis Database The article is just like its name. 5. Collected Papers of China General Manager Network 6. Mba professional managers forum 4...

  Education/Science

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• How to reduce surface defects such as air holes and sand holes of aluminum alloy rotational molding die?

  There are three ways to reduce porosity: 1。 The smelting temperature should be as low as possible, as long as the casting can be guaranteed. 2。 Better refining agent shall be used. If necessary, argon or nitrogen can be added again and again for refining. 3。 Cold iron shall be placed on the surface that is easy to produce pores. sand holes: It is mainly because the sand is not removed completely. After the sand mold is completed, the "sand" must be blown clean with compressed air. Be careful not to drop sand when closing the box.

  Engineering Technology Science

  1 answer

• Surface repair of aluminum alloy and cast iron

  Thank you for your question. Please refer to my blog post

  Online help

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• Could you tell me if I installed insulating glass? Is there another way to isolate the sound

  It seems that there is nothing better. You can add curtains and make double layers, which can also effectively enhance the sound insulation effect

  shopping

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• How to solve the problem of aluminum alloy welding porosity?

  Porosity problem: different aluminum alloys have different types of pores. It is generally believed that the aluminum alloy produces the following types of pores during welding: hydrogen and pores. After the aluminum alloy is melted in the hydrogen environment, its internal hydrogen content can reach more than 0.69ml/100g. However, after solidification, its hydrogen solubility in equilibrium is only 0.036ml/100g at most

  Engineering Technology Science

  1 answer

• How to repair defects such as air holes in aluminum alloy castings?

  It can be welded by burning aluminum

  Engineering Technology Science

  1 answer

• How to solve the air hole of aluminum alloy brake pump?

  The casting defects of aluminum alloy include pinholes due to hydrogen precipitation due to melting operation, casting turbulence due to rapid mold filling and reasonable runner design, etc; For pinholes, the refining efficiency is mainly improved to completely remove hydrogen; For the slag hole, the mold filling channel should be improved to reduce the mold filling speed and then optimize the mold exhaust

  Engineering Technology Science

  1 answer