Shanxian Chemical
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Hydrogen Brazing Key Concepts
On Hydrogen Brazing
First, the principle of the key concept of hydrogen brazing
Hydrogen braders use hydrogen as a boost to achieve the connection of metal parts. Hydrogen is not only a reactant, but also a protective medium. When heated, hydrogen can combine with the oxide on the metal surface to reduce it, thereby removing the barrier that hinders the bonding of the solder metal with the base metal. This is based on the reducibility of hydrogen. Under high temperature environments, hydrogen and metal oxides undergo oxidation-reduction reactions, such as hydrogen reacting with copper oxide to generate water and copper, ensuring the purity of the metal surface and paving the way for the infiltration and bonding of the solder metal.
Second, the equipment of the key concept of hydrogen brazing
To perform hydrogen brazing, specific equipment is required. The heating device must be able to precisely control the temperature to reach the high temperature required for brazing, and the temperature distribution must be uniform to avoid deformation or poor bonding due to uneven heating of the parts. The hydrogen supply system is also crucial, and it is necessary to be able to provide an appropriate amount of hydrogen stably, and the flow rate and pressure of hydrogen can be flexibly adjusted according to the process requirements. At the same time, the sealing performance of the equipment must be excellent to prevent hydrogen leakage, to ensure safety, and to maintain the effective concentration of hydrogen in the brazing environment, so that the brazing process can proceed smoothly.
Third, the process of key concepts of hydrogen brazing
The process of hydrogen brazing covers many links. The first is the pretreatment of the weldment. It is necessary to carefully clean the oil and impurities on the surface of the weldment to ensure that the surface is clean, so as to facilitate subsequent brazing. Next, the suitable solder is selected, and the composition and characteristics of the solder are considered according to the material and use requirements of the solder. During the heating process, the heating rate, holding time and cooling rate are strictly controlled. If the heating is too fast, it may cause the weldment to overheat locally; if the holding time is insufficient, the solder is difficult to fully integrate with the base metal; if the cooling is too fast, it is easy to cause internal stress in the weldment. In addition, the timing and duration of the introduction of hydrogen also need to be precisely pinched to exert its best effect.
Fourth, the advantages of the key concepts of hydrogen brazing
Hydrogen brazing has significant advantages over other methods. First, due to the reduction of hydrogen, the surface oxides of the weldment can be effectively removed, and the quality of the brazed joint is high, and the bonding strength is quite high. Second, hydrogen, as a shielding gas, can avoid secondary oxidation of the weldment at high temperatures and ensure the surface quality of the weldment. Third, the process is relatively environmentally friendly, and the chemical reaction products involved are mostly harmless substances such as water, which is environmentally friendly. Therefore, hydrogen brazing has broad application prospects in many fields, such as electronics, aerospace, etc.
First, the principle of the key concept of hydrogen brazing
Hydrogen braders use hydrogen as a boost to achieve the connection of metal parts. Hydrogen is not only a reactant, but also a protective medium. When heated, hydrogen can combine with the oxide on the metal surface to reduce it, thereby removing the barrier that hinders the bonding of the solder metal with the base metal. This is based on the reducibility of hydrogen. Under high temperature environments, hydrogen and metal oxides undergo oxidation-reduction reactions, such as hydrogen reacting with copper oxide to generate water and copper, ensuring the purity of the metal surface and paving the way for the infiltration and bonding of the solder metal.
Second, the equipment of the key concept of hydrogen brazing
To perform hydrogen brazing, specific equipment is required. The heating device must be able to precisely control the temperature to reach the high temperature required for brazing, and the temperature distribution must be uniform to avoid deformation or poor bonding due to uneven heating of the parts. The hydrogen supply system is also crucial, and it is necessary to be able to provide an appropriate amount of hydrogen stably, and the flow rate and pressure of hydrogen can be flexibly adjusted according to the process requirements. At the same time, the sealing performance of the equipment must be excellent to prevent hydrogen leakage, to ensure safety, and to maintain the effective concentration of hydrogen in the brazing environment, so that the brazing process can proceed smoothly.
Third, the process of key concepts of hydrogen brazing
The process of hydrogen brazing covers many links. The first is the pretreatment of the weldment. It is necessary to carefully clean the oil and impurities on the surface of the weldment to ensure that the surface is clean, so as to facilitate subsequent brazing. Next, the suitable solder is selected, and the composition and characteristics of the solder are considered according to the material and use requirements of the solder. During the heating process, the heating rate, holding time and cooling rate are strictly controlled. If the heating is too fast, it may cause the weldment to overheat locally; if the holding time is insufficient, the solder is difficult to fully integrate with the base metal; if the cooling is too fast, it is easy to cause internal stress in the weldment. In addition, the timing and duration of the introduction of hydrogen also need to be precisely pinched to exert its best effect.
Fourth, the advantages of the key concepts of hydrogen brazing
Hydrogen brazing has significant advantages over other methods. First, due to the reduction of hydrogen, the surface oxides of the weldment can be effectively removed, and the quality of the brazed joint is high, and the bonding strength is quite high. Second, hydrogen, as a shielding gas, can avoid secondary oxidation of the weldment at high temperatures and ensure the surface quality of the weldment. Third, the process is relatively environmentally friendly, and the chemical reaction products involved are mostly harmless substances such as water, which is environmentally friendly. Therefore, hydrogen brazing has broad application prospects in many fields, such as electronics, aerospace, etc.
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