6 proplems welding of ship aluminum

Updated : Jan. 31, 2024
Table of Contents
  1. Oxidation
  2. Pore
  3. Large expansion coefficient
  4. The connector is not waiting for strong
  5. Fast thermal conductivity, high thermal capacity
  6. When turning from solid state to liquid state, it is easy to cause welding collapse to form welding tumors

Welding aluminum alloy is a certain challenging project, because aluminum alloy has some unique physical and chemical characteristics, and there are many problems related to the welding process.

6 proplems welding of ship aluminum

Oxidation

The combination of aluminum and oxygen is easy to generate alumina (Al2O3) film. The characteristics of this oxide film have a series of effects on welding.

  • First of all, the melting point of the oxide film is quite high to 2050 ° C, while the melting point of aluminum alloy is only 660 ° C, which makes it difficult to melt the oxide film during welding.
  • Secondly, the density of the oxide membrane is high, and oxide slag is easily formed in the weld, which affects the welding quality.
  • In addition, the oxide film is low, and it is easy to transmit electrons, resulting in unstable welding arc.

Welding aluminum alloys need to take measures to deal with oxide films, such as proper protective gas, clean welding surface, etc.

Pore

The melting degree of hydrogen in aluminum increases with increased temperature, but the solubility of hydrogen is about 20 times compared to the liquid and coagulation point. Therefore, when aluminum alloy is cooled and solidified, a large amount of hydrogen is analyzed to form a pores. The pores have negative effects on the strength and sealing of the welded joint. In order to reduce the formation of pores, measures need to be taken during welding, such as using low hydrogen electrodes, controlling welding speed and welding parameters.

Large expansion coefficient

The expansion coefficient of aluminum is large, and the expansion volume during welding is about 2 times the steel, and the volume decrease in volume is about 5%during solidification. This leads to a large deformation during welding, especially for rigid components with large stress, which may cause cracks in welds, melting lines and thermal influence areas. In order to reduce welding deformation, preheating methods can be used, especially for thicker aluminum plates. Generally, preheating is needed when the thickness of the plate is greater than 10mm.

The connector is not waiting for strong

After welding, the mechanical properties of aluminum alloy joints have decreased more obvious, and there is a phenomenon of softening in the area of heat. Unlike the steel welding tank, welding aluminum alloys need to choose the welding method of centralized calories, correct welding materials, and a standardized welding process. This helps improve the strength and corrosion resistance of the welding joint.

Fast thermal conductivity, high thermal capacity

Aluminum alloy has high thermal conductivity and thermal capacity. Therefore, the welding method of centralized concentration is needed during welding to ensure that the welding area is uniform. For thicker aluminum plates, especially when the thickness of the plate is greater than or equal to 10mm, preheating may be required to reduce the thermal stress during the welding process.

When turning from solid state to liquid state, it is easy to cause welding collapse to form welding tumors

During the welding process of aluminum tube, in order to meet the requirements of single -sided welding double -sided formation, the weld must have an appropriate amount of collapse. Welders need to closely observe the melting pool during operation to ensure the temperature and liquidity during the welding process, so as to achieve the ideal weld shape and avoid the formation of welding tumors.

Welding aluminum alloy requires comprehensive consideration of the characteristics of the material and the problems that may be encountered during the welding process, and adopt appropriate welding methods, process and control measures to ensure the quality and performance of the welding joint.

Related Topics: Marine Aluminum Boat Aluminum Ship Aluminium

Related Blogs:

  • ER5183 ER5356 Tanker Aluminum Welding Wire

    As the demand for aluminum can trucks grows day by day, so does the demand for aluminum welding wire. Commonly used aluminum welding wires for tank trucks are ER5183 and ER5356.

  • 5083 5086 Aluminum plate for ship deck

    In ship engineering, 5083 and 5086 aluminum alloys are often chosen as deck materials because they have good corrosion resistance and high strength in seawater environments.

  • Best aluminum for salt or fresh water

    When choosing marine aluminum in fresh and salt water environments, the main consideration is the corrosion resistance of the material. It is crucial to choose an aluminum alloy suitable for the marine environment.

  • Best aluminum for marine use

    The best choice of marine aluminum needs to be considered in conjunction with specific application requirements, shipbuilding standards, and cost.

  • Aluminum Plate for Yachts Building

    5083 5052 Boat aluminum plates have made them an ideal material suitable for yacht manufacturing because of their lightweight, high strength, corrosion resistance and easy processing characteristics.

  • Principles for the selection of aluminum alloy for ships

    Because ship aluminum alloy is used in marine ships and other fields, it has stricter process requirements and performance standards than other ordinary aluminum alloy products.

  • LPG natural gas (LNG) transport ship for 5083 aluminum plate

    The 5083 aluminum plate has sufficient strength, ductility, and low temperature specialtability, which can keep the LNG ship stable in transportation.

  • 9 Advantages Aluminum AlLoy in Ship Applications

    The application advantages of aluminum alloy on ships include small proportion, good corrosion resistance, strong processing and forming performance, good welding performance, small elastic modulus, recyclable use, etc.

  • How to treat corrosion treatment for boat aluminum plates?

    Anti -corrosion for ships can be used to extend the life of aluminum plates by sacrificing anode cathode protection, anti -corruption and anti -pollution coating.

  • Temper of marine aluminum alloys

    The selection of TEMPER processing status can adjust the performance of aluminum alloy to a certain extent to meet the engineering needs of different hull structures.

  • 5059 O H111 H116 H321 Marine Aluminum Plate Sheet

    5059 O H111 H116 H321 Aluminum alloy plates are widely used in shipbuilding, marine engineering, oil field platforms, marine pipelines and other fields.

Leave your needs

*We attach great importance to your privacy. All information is only used for technical and commercial communication and will not be disclosed to third parties.

Various customized professional services

Hello, in order to efficiently and accurately provide the specific price of the product, please leave a detailed alloy brand, status, thickness, purpose, etc. our professionals will reply to you in time and look forward to your consultation.