Transient liquid phase bonding
Transient liquid phase welding is a diffusion welding process where an interlayer solidifies isothermally and then melts during the holding process. This ensures defect-free high-temperature joints.
Physicochemical Mechanism of Action
In transient liquid phase welding, an interlayer is placed between two metal parts and solidifies isothermally. During the holding process this interlayer melts and reacts completely with the metals. This produces a homogeneous joint without pores or cracks.
Metallurgical Relevance & Welding Risks
This process is especially suited for high-temperature applications because it allows defect-free joints. Wrong temperature control during the holding process can lead to incomplete reaction and pore formation. Too-high temperatures can contaminate the metal or hurt its properties.
Workshop Practice & Instructions
• Temperature control: Keep the joint constant during isothermal solidification and watch the temperature closely during the holding process.
• Time management: Mind the correct holding time to ensure the interlayer reacts completely. The time should be between 10 and 30 seconds, depending on the materials used.
• Cleanliness: Use clean metal parts and a fine interlayer to avoid pore formation.