Broken ho ho brazing solder is directly in contact face of the tool, complete with Gao solder crushing operations, and ho brazing material, size and shape of the crushing effect has a great influence, Gao solder according to the shape and length of the seam hardness to select, such as brazing seam hard is ho short, and vice versa long. Soft ore seam or crack with a length of 300-400 mm is generally used in the ho brazing, very hard seam, then use 150-300 mm.