Melting the base metal is not necessary since the 528 rod has a built-in flux. Consequently, clearance should be around .003 for maximum tensile and shear strength. The 528 rod takes extreme heat, above 1400 degrees to penetrate the pores of the metal so you will need oxygen and gas to produce this heat. HTS-528 can be used to braze cast iron, brass, nickel, copper, and more than 50 different kinds of steel, including stainless. Open the pours around the area to be repaired, drill, and grind out a U shape in the metal, so it is no longer a hairline crack.

We recommend first practicing with cast iron by grinding a slot 1/16th to 1/8th of an inch into the metal. Use a brazing tip to bring the metal to 1400 degrees. The metal will start to turn red at 600 degrees, but continue heating, test the rod on the metal 1/4 inch outside the bulk of the flame. The rod has a flux core that will melt much lower than the rod, so if the rod itself will not melt, have patience. When you are close to 1400 degrees, it will look like you're going to burn a hole in the metal but do not worry. Once you see the rod itself is melting, scratch the rod all around the area to be repaired. The rod will melt and, with the help of the flux core, will fuse down into the metal. This auction is for 10 x rods the rod is 2mm