Lead-free solder flux for stainless steel soldering
Release time:
2021-11-12 10:57
There are more complex oxides on the surface of stainless steel, and in addition to Fe oxides, they also contain oxides of Cr, Ni, Mn, Ti, Mo, W and V. Chromium oxide is a relatively stable oxide, which is difficult to remove, and a strong active flux must be used. And stainless steel containing Ti, its oxide is more stable, more difficult to remove. In order to ensure that the performance of the brazing head meets the requirements, a strong active flux is usually used in the brazing process to completely remove the metal oxide film such as chromium oxide on the surface to be welded. The stainless steel flux can react with the oxide film on the metal surface at a certain temperature, so that the surface of the welded material is integrated with the liquid solder, so as to achieve the joint between the metal and the metal. This tin welding technology has been widely used in various types of stainless steel manufacturing.
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Classification, type and characteristics of flux
The brazing flux (flux) is the flux used in the brazing process, and is used in combination with the brazing filler metal to ensure the smooth brazing process and obtain a dense joint. The function of flux is to remove the oxide on the surface of molten solder and base metal, protect the surface of solder and base metal from further oxidation, improve the wettability of solder to base metal, promote the interface activation, so that it can realize the brazing process smoothly. The reasonable selection of flux and filler metal plays a key role in the quality of brazed joints.
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Lead-free reflow soldering - flux
The standardization of the alloy composition of lead-free solder is not clearly stipulated at present. The opinion of most business associations such as IPC: Alloys with lead content <0.1-0.2WT % (tend to < 0.1%, and do not contain any other toxic elements are called lead-free solder alloys. Lead-free solder alloy
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