Pure Aluminum Pipe and Plate Welding Application | Isso Mak
Also known as pure aluminum or commercial grade aluminum, 99.9% pure aluminum is a high quality aluminum grade with minimal contamination. It is widely used in a variety of industrial applications, including welding applications. When it comes to aluminum tube and sheet welding, 99.9% pure aluminum offers several advantages and considerations. Some information about its use in welding applications:
  • Purity: The high purity of 99.9% aluminum provides excellent weldability. It has low levels of impurities such as iron, copper, silicon and zinc that can adversely affect the welding process. The absence of these impurities helps to produce high quality and error-free welds.
  • Ductility: Pure aluminum has high ductility, meaning it can be easily formed and welded without cracking or breaking. This feature makes it suitable for various welding techniques such as gas tungsten arc welding (GTAW/TIG), gas metal arc welding (GMAW/MIG) and resistance welding.
  • Thermal conductivity: Aluminum has high thermal conductivity, that is, it quickly removes heat from the weld area. This feature can be advantageous to avoid excessive heat generation during welding and to minimize the risk of distortion or warping of welded components.
  • Joint preparation: Proper joint preparation is essential for successful aluminum welding. This typically includes cleaning the surfaces to be welded, removing the oxide layers and ensuring a tight fit. Use appropriate cleaning methods such as mechanical cleaning, solvent cleaning or alkaline cleaning to ensure optimum weld quality.
  • Shielding gas: When welding 99.9% pure aluminum, it is important to use a suitable shielding gas to protect the weld area from atmospheric contamination. Argon is commonly used as a shielding gas in TIG welding applications, while a mixture of argon and helium can be used for MIG welding. The choice of shielding gas depends on the particular welding process and the desired results.
  • Filler material: Compatibility of the filler material with the base metal is important to obtain strong and reliable welds. When welding 99.9% pure aluminum, it is recommended to use filler wire of similar composition. Aluminum alloy filler wires such as the 1XXX series are widely used in pure aluminum welding applications.
  • Welding technique: Different welding techniques can be used for welding aluminum tube and sheet, including TIG welding, MIG welding and resistance welding. TIG welding is often chosen for its precision and ability to produce high quality welds, while MIG welding offers higher coating rates and increased productivity.
  • Post-weld treatment: After welding, it is important to inspect and clean the weld area to ensure it meets the required standards. Depending on the application, other post-weld treatments such as stress relieving or heat treatment may be necessary to achieve the desired properties and reduce residual stresses.