What are the possible reasons for the redness of oxygen free copper after welding in vacuum eutectic furnace

According to the relevant introduction, more and more high-voltage electrical components complete efficient welding in vacuum eutectic furnace. This is because the bubble rate can be greatly reduced in the real environment, especially the welding quality of those vacuum eutectic furnaces with good service reputation is well-known in many industries. Now, a brief description is given on the possible reasons for the red color of oxygen free copper after vacuum eutectic furnace welding:

1. Oxygen content of oxygen free copper exceeds the standard

According to the investigation, many oxygen free copper workpieces and stainless steel parts are welded by vacuum eutectic furnace. However, if the parts and components of high-voltage apparatus turn red after welding, and the oxidation color of its inner wall gradually becomes lighter from bottom to top, and the inner wall of most oxygen free copper turns blue or yellow after oxidation, it indicates that the oxygen content of oxygen free copper exceeds the standard.

2. Coarse grain of material

Many people do not understand the phenomenon that oxygen free copper turns red after welding in vacuum eutectic furnace. In fact, there are many reasons for redness. If the grains of some oxygen free copper are relatively coarse, it is prone to uneven heating during welding. In addition, these oxygen free copper are placed randomly in the furnace and there is no designated place, so it may also cause uneven welding at this time.

3. Adsorb the evaporation in the vacuum furnace

The welding ability of vacuum eutectic furnace is very strong, and the reason why some oxygen free copper will turn red during welding is that this part of oxygen free copper may undergo chemical transformation reaction due to the adsorption of evaporation in the vacuum furnace. For example, after welding, in addition to the elements contained in the workpiece itself, there are some Ag elements, and Ag elements are the products adsorbed after high-temperature evaporation of solder.

The excellent welding ability of vacuum eutectic furnace has been shown in the welding operation of high-voltage electrical components, especially those recognized vacuum eutectic furnaces have greatly improved the welding efficiency and quality. If the oxygen free copper turns red after welding in the vacuum eutectic furnace, the reason for this phenomenon is not only that the oxygen content of the oxygen free copper itself exceeds the standard, but also that the material grain is coarse or the oxygen free copper adsorbs the evaporation in the vacuum furnace.