Process setting of brazing temperature
Release time:
2023-01-08
【Summary Description】 When brazing, is the higher the temperature the better? The brazing temperature is one of the most important parameters in the welding process. At the brazing temperature, in addition to the brazing filler metal melting, filling and interaction with the base metal to form a joint, some welding methods (such as furnace brazing, etc.) can also complete the post-brazing heat treatment process (such as solid solution treatment, etc.) to improve the performance of the brazed joint. Brazing temperature is too high, easy to cause the solder and the base metal interaction is excessive, resulting in the base metal corrosion, resulting in brittle metal layer, so that the mechanical properties of the joint deterioration, at the same time will make the base metal brittle. If the brazing heating temperature is low, the brazing material flow distribution and infiltration are insufficient, so that the joint gap is not easy to be filled, thus forming a bad joint. How should the brazing temperature be determined? In general, the brazing temperature should be suitably higher than the melting point of the pin, and is usually set to be 25 to 60 ° C. higher than the liquidus temperature of the brazing material. On the one hand, the higher temperature is used to improve the wetting and filling of the solder, and the needle and the base metal can fully interact with each other, thereby improving the strength of the joint; On the other hand, it avoids the high temperature may cause the evaporation of the low boiling point components in the solder and the melting corrosion caused by the excessive interaction between the base metal and the solder, the formation of brittle compounds and intercrystalline infiltration, so as to avoid the decline of the strength of the joint. In addition, for some brazing methods (such as furnace brazing, etc.), the requirements of the material heat treatment specification should also be taken into account when determining the brazing temperature, so that the brazing and heat treatment processes can be completed in the same heating and cooling cycle. This not only saves man-hours, but also avoids the possible adverse consequences of post-weld heat treatment.
When brazing, is the higher the temperature the better?
The brazing temperature is one of the most important parameters in the welding process. At the brazing temperature, in addition to the brazing filler metal melting, filling and interaction with the base metal to form a joint, some welding methods (such as furnace brazing, etc.) can also complete the post-brazing heat treatment process (such as solid solution treatment, etc.) to improve the performance of the brazed joint.
Brazing temperature is too high, easy to cause the solder and the base metal interaction is excessive, resulting in the base metal corrosion, resulting in brittle metal layer, so that the mechanical properties of the joint deterioration, at the same time will make the base metal brittle.
If the brazing heating temperature is low, the brazing material flow distribution and infiltration are insufficient, so that the joint gap is not easy to be filled, thus forming a bad joint.
How should the brazing temperature be determined?
In general, the brazing temperature should be suitably higher than the melting point of the pin, and is usually set to be 25 to 60 ° C. higher than the liquidus temperature of the brazing material.
On the one hand, the higher temperature is used to improve the wetting and filling of the solder, and the needle and the base metal can fully interact with each other, thereby improving the strength of the joint;
On the other hand, it avoids the high temperature may cause the evaporation of the low boiling point components in the solder and the melting corrosion caused by the excessive interaction between the base metal and the solder, the formation of brittle compounds and intercrystalline infiltration, so as to avoid the decline of the strength of the joint.
In addition, for some brazing methods (such as furnace brazing, etc.), the requirements of the material heat treatment specification should also be taken into account when determining the brazing temperature, so that the brazing and heat treatment processes can be completed in the same heating and cooling cycle. This not only saves man-hours, but also avoids the possible adverse consequences of post-weld heat treatment.
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