Recently, I bought gold jewelry. My colleague said that the joints of gold jewelry are welded with brass, so the more the joints, the more the brass takes up, isn't it?
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K gold jewelry is brazed
1. Brazing is a welding method that uses a metal material with a lower melting point than the base metal as the filler metal, heats the weldment and filler metal to a temperature higher than the melting point of the filler metal and lower than the melting point of the base metal, wets the base metal with liquid filler metal, fills the joint gap, and diffuses with the base metal to achieve connection
the flux can remove impurities such as oxide film and oil stain, and protect the base metal contact surface and solder from oxidation. According to the melting point of the solder, it can be divided into soft soldering (<450 ℃) and hard soldering (> 450 ℃)
2. Solder free technology is adopted for welding of full gold jewelry
extended data:
brazing process of brazing
copper and copper alloy can be brazed by soldering iron, immersion, flame, induction, resistance and furnace heating methods according to the shape, size and quantity of weldments. The heating speed and heating time of various methods are different, and the appropriate solder, flux and protective atmosphere must be reasonably selected at the same time. In principle, the rapid heating method is mainly used because:
① some solders have melting out during melting, and the heating melting speed is fast, but the melting out is not serious
② the active action time of the flux is limited, and the slow heating speed may make the flux effective before the completion of brazing
③ slow heating seriously oxidizes the surface of brazing metal and hinders the spreading of brazing filler metal
④ slow heating will prolong the action time between the molten solder and the base metal, form intermetallic compounds at the interface or cause corrosion, and deteriorate the performance of the joint
reference source: Baidu Encyclopedia - brazing
K gold jewelry is brazed
brazing is a welding method that uses a metal material with a lower melting point than the base metal as the filler metal, heats the weldment and filler metal to a temperature higher than the melting point of the filler metal and lower than the melting point of the base metal, wets the base metal with liquid filler metal, fills the joint gap, and diffuses with the base metal to achieve connection. The flux can remove impurities such as oxide film and oil stain, and protect the base metal contact surface and solder from oxidation. According to the melting point of the solder, it can be divided into soft soldering (<450 ℃) and hard soldering (> 450 ℃)
solder free technology is adopted for welding of full gold jewelry
the following describes the characteristics of qianzujin air brazing:
① low melting point brazing filler metal is used as the filler metal. The brazing filler metal melts, but the base metal does not melt
② the workpiece heating temperature is low, the joint structure and performance change is small, the weldment deformation is small, the joint is smooth and flat, and the weldment size is accurate
③ different metals can be welded, and the thickness of weldments is not limited
④ it has high production efficiency, can be heated as a whole, and can weld all the welds of the whole structure at one time, which is easy to realize mechanization and automation. Preheating before welding can reduce the temperature difference and stress of the workpiece; Annealing shall be conducted after welding to eliminate welding residual stress
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the gold content of pure gold (i.e. full gold and thousands of full gold) jewelry is relatively high. Some consumers ask how to ensure the quality of materials with such a high gold content, such as welding with gold solder equipped with other materials? In fact, the process of processing pure gold jewelry in China is different from that of processing low fineness jewelry (such as 14K and 18K). The welding of low fineness jewelry is carried out with solder. The formula of solder can ensure that the gold content of its jewelry is not lower than the specified standard. For example, for the welding of 14K jewelry, the gold content of the solder used is 58.5% (14K standard gold content), and the remaining 41.5% is low melting point material. Such solder can not only weld jewelry, but also ensure that the gold content and composition of jewelry remain unchanged. However, if pure gold solder is prepared, the problem will arise, because the gold content of the solder is not less than 99%, or 99.9%, and the low-melt material in the solder can only be controlled within the range of 0.1% - 1%. It is impossible to meet the requirements by relying on such a small amount of low-melt material. Therefore, pure gold jewelry can't be soldered in general
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the purity specifications of gold jewelry include: thousand gold, full gold, 22K, 18K, 14K and 9K:
1) the gold content of thousand gold should be greater than or equal to 999 ‰
2) the gold content of full gold should be greater than or equal to 990 ‰
3) the gold content of 22K should be greater than or equal to 916 ‰
4) the gold content of 18K should be greater than or equal to 750 ‰
5) the gold content of 14K should be greater than or equal to 585 ‰
6) the gold content of 9K should be greater than or equal to 375 ‰
7) 24K is the theoretical value, and its gold content is 100%;
The purity of gold jewelry must be high, reaching four nines and three nines, so when welding, it is pure gold, which is completed by hot melting
The welding points of gold jewelry are partly gold and partly other materials! When you buy back a piece of jewelry, the gold content is fixed
if you want to reprocess! Gold will dissolve into other materials, resulting in a reduction in the composition of gold!