When soldering stainless steel, it's important to choose the right type of solder to ensure a strong and reliable joint.
7 Key Points to Consider
1. Silver-Containing Solders
It is recommended to use solders that contain silver. These do a better job with the soldering process.
2. Tin-Lead Solder for Soft Brazing
Tin-lead solder with a higher tin content is commonly used for soft brazing of stainless steel. A higher tin content improves the wetting ability on stainless steel surfaces.
3. Joint Strength Considerations
However, it should be noted that the joint strength of stainless steel joints brazed with tin-lead solder is relatively low. This makes it suitable for brazing parts with low load-bearing requirements.
4. Pre-Brazing Cleaning
Before brazing stainless steel, it is important to carry out strict cleaning to remove any grease and oil film. Brazing should be done immediately after cleaning.
5. Brazing Methods
Brazing of stainless steel can be performed using flame, induction, or furnace heating methods. When using a furnace for brazing, it is crucial to have a good temperature control system with a deviation of brazing temperature within ±6℃ and the ability to cool rapidly.
6. Special Solders for Brazing
In some cases, nickel-chromium-boron and nickel-chromium-silicon solders are used for brazing stainless steel joints. After brazing, diffusion heat treatment may be applied to reduce the requirements for joint gaps and improve the structure and properties of the joint.
7. Brazing Techniques
There are three main methods commonly used for brazing stainless steel: brazing in air with flux, brazing under a reducing atmosphere, and vacuum brazing. For brazing in air with flux, low-temperature silver brazing alloys are generally recommended.
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