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Soudures pour soudage/brasage par induction

How to choose solder?

Choosing the right solder for induction welding/brazing involves considering the materials being joined, the desired strength of the joint, and the specific requirements of the induction welding/brazing process. Here are some key points to consider:

  • Compatibilité des matériaux: The solder should be compatible with the materials being joined. Common fillers for induction soldering include alloys such as tin-silver, tin-zinc, and tin-lead. For example, if you’re joining copper parts, a solder with a high copper content would be beneficial for conductivity.
  • Conductivité: For conductive parts, it’s often best to use silver solder because of its higher conductivity. For example, a solder with 72% silver and 28% copper has a conductivity of 87%.
  • Sélection des flux: Using flux can clean the surfaces and prevent oxidation during soldering. The choice of flux depends on the materials and the type of solder. The type of flux used can affect the flow and bonding strength of the solder.  Some solders come with a core of flux, while others require a separate application.  Different types of flux are suited for different applications, such as type R, RA, RMA, organic core, and silver solder. 
  • Solidité et durabilité: Consider the mechanical and thermal stresses the joint will undergo. For high-strength applications, silver solder is often recommended due to its strong bond and higher melting point.
  • Exigences de température: Soldering is performed at lower temperatures compared to brazing and welding, which may result in a slightly weaker joint but is preferable for some applications like small components.
  • Induction Frequency: For most inductive applications, frequencies below 500 kHz are typically chosen due to their ideal blend of surface penetration, energy density, and low dependence on material characteristics. For some small or thin workpieces, in order not to damage the base metal during welding, it may be necessary to choose ultra-high frequency induction.
  • Sécurité et santé: Some solders contain lead, which can be hazardous. Lead-free solders are available and may be required for certain applications. Make sure to work in a well-ventilated area and use appropriate personal protective equipment.

Remember, the efficiency of an induction heating system for a specific application depends on the characteristics of the part itself, the design of the inductor, the capacity of the power supply, and the amount of temperature change required for the application. 

Soudures pour brasage par induction
Soudures pour brasage par induction
Solder strips for induction welding
Solder strips for induction welding
Alloy solder for induction welding
Alloy solder for induction welding
Alloy solder rings
Alloy solder rings

Effect of solder on induction welding/brazing results

Aluminum solder rings
Aluminum solder rings
Automatic solder feeding system
Automatic solder feeding system

The solder used in induction welding/brazing significantly affects the appearance, quality, and characteristics of the final solder joint. Here are some key points on how solder impacts induction welding/brazing results:

  • Chauffage localisé: Induction welding allows for quick heating of a targeted area, which means that the parts are subjected to heat for a shorter amount of time. This results in cleaner joints with less spatter.
  • Solder Alloys Mixing: The use of ponderomotive forces in induction welding aids in the mixing of solder alloys and the spreading of solder over soldering surfaces.
  • Qualité des joints de soudure: Because only the targeted area is heated, adjacent materials are not unnecessarily exposed to excess heat, which can lead to distortion, surface corrosion, oxidation, and potential failure.
  • Temperature Self-Regulation: In some applications, alloys can be chosen such that inductive temperature self-regulation occurs when the Curie temperature of the work-piece material is just above the melting temperature of the solder.
  • Géométrie de la pièce: The geometry of the workpiece can affect the coupling efficiency during induction heating, which in turn influences the quality of the soldering operation.

The efficiency of an induction heating system for a specific application depends on the characteristics of the part itself, the design of the inductor, the capacity of the power supply, and the amount of temperature change required for the application. It’s always best to consult with us or a professional equipment manufacturer if you’re unsure about the best solder for your needs.

To learn more about induction welding/brazing applications

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