High-Temperature Brazing

Brazing you do above 900 °C, usually under shielding gas or in vacuum. This way you can join even high-strength materials cleanly without the base material warping much. If the temperature isn't right, it won't work: too cold and the filler metal won't wet properly, too hot and you get an unclean, spongy seam. When cooling, you have to be careful it doesn't go too fast, otherwise the structure becomes hard and brittle and can crack. Use high-strength brazing alloys that fit the application and keep the temperature constant. Then the joint will hold.