9. Defectology
Thermite welding has a number of weaknesses:
disturbed internal cleanliness (blowholes, hercynites) due to inadequate settling times, combined with reactions that are sometimes too slow;
As far as blowing is concerned, the maximum reaction temperature should be limited to 2,000°C by adding an adequate quantity of cooling scrap, since the Richardson diagram (figure 1 ) shows that, above this temperature, carbon becomes more reductive than aluminum and favors the appearance of carbon monoxide CO (blowing);
of this metallographic set, fractures such as the one shown in figure
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Defectology
Conclusion
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