The Welding Flux had three types: 1.BC-100 This products is fit to braze steels,copper alloys as well as to weld steel/copper dissimilar alloys.This product can be employed to weld alloys directly by dipped onto solder,and it can also be brushed uniformly on solder and the surface of joint.It can be used with high efficiency and convenience.Ans it is easy to control the dosage of flux during brazing. 2.BC-101 This product is fit to braze copper and copper alloys. 3.BC-102 This solvent that is fit from 600 to 850 temperature mixes silver drill rod material,drill rod copper,copper with alloy,carbon steel and stainless steel etc,it can fuse oxide of metal surface and flow sheet in drill rod material.