Flux and hard lead welding difficult wetted metal material

Application Number: 00107501
Application Date: 2000.05.08
Publication Number: 1273155
Publication Date: 2000.11.15
Priority Information: 1999/5/8 DE 199 21 332.1
International: B23K35/363
Applicant(s) Name: Degussa. Juers AG.
Inventor(s) Name: Juergen Kech;Sandra Wittpar;Wolfgang Weber
Patent Agency Code: 72002
Patent Agent: yu hui
Abstract A flux based on inorganic boron and/or halogen compounds for brazing difficult to wet metallic materials with silver- and copper-based solders, which contains, as an activating addition, based on the total amount of the flux, 0.01-10 wt. % of elemental boron and 0.01-10 wt. % of at least one of the elements Mo, W, Mn, Co, Ni, Pd, Cu or Ag in the form of elements, alloys or compounds. The activating addition brings about a substantial increase in the wettability by the solder, particularly in the case of difficult to wet stock materials.