The advantage of thermit welding is that

Advantages of thermit welding is listed below:
• The weld formed has high mechanical strength.
• Excellent corrosion resistance as compared with other forms of weld.
• It is highly stable to repeated short circuit pulses.
• The electrical resistance remains unchanged over lifetime of the installation.
• All parts of the weld section are molten at the same time.
• Weld cools almost uniformly.
• Results in a minimum problem with internal residual stresses.