Copper brazing manufacturing method of fuel distribution pipe and radial connecting part of main pipe

Abstract

The invention discloses a copper brazing manufacturing method of a fuel distribution pipe. The method is characterized in that press fitting and projection welding, instead of argon-arc welding or laser welding, are carried out to position, so that the uniformity of welding gaps among parts can be effectively improved, and the consistency of the quality of the welding gaps formed after the copper brazing can be ensured; a built-in copper ring or copper sheet is used and replaces externally-paved copper adhesive, so that copper can permeate from inside to outside during the copper brazing process, and as a result, the welding gaps can be fully filled with the copper adhesive; in addition, the flowing conidtio of the copper adhesive in the welding gaps can be inspected through the appearance rather than a destructive way, so that he production cost can be reduced. The invention discloses a radial connecting part of the main pipe.

Description

technical field [0001] The invention relates to mechanical processing and manufacturing technology, in particular to a copper brazing manufacturing method of a fuel distribution pipe and a radial connecting part of a main pipe. Background technique [0002] High-pressure fuel distribution pipes are widely used in direct injection engines to store and distribute high-pressure fuel. Such as figure 1 , figure 2 As shown, the high-pressure fuel distribution pipe is generally composed of a main pipe 1, a bracket 2, an injector seat 3, a sensor joint 4, a pipe joint 5 and an end cover 6. [0003] Brazing is to use a metal material with a lower melting point than the base metal as the solder, heat the weldment and the solder to a temperature higher than the melting point of the solder and lower than the melting temperature of the base metal, use liquid solder to wet the base metal, fill the gap between the joints and The method of interdiffusion with the base metal to realize t...

AI Technical Summary

Problems solved by technology

In addition, the energy of argon arc welding or laser welding is high, so that the parts to be welded are connected through the melting of the material body, forming a large heat-affected zone at the welding point and reducing the strength of the material body; and the existence of the external tack welding spot 8 affects The continuity of the flow of copper glue 7 is not conducive to the formation of evenly transitioned rounded corners at the joints of the welds, resulting in stress concentration at 8 solder joints of tack welding, such as Figure 5 shown

[0010] 2) The copper glue 7 is coated on the outside of the joints of the parts, and penetrates from the outside to the inside under high temperature in the brazing furnace. It is impossible to 100% visually observe whether the copper glue 7 has penetrated the entire inner surface or filled the entire solder joint. There is a possibility that the internal gap filling is not full, which will affect the quality of the weld seam

However, due to the process of the casting itself, the surface of the parts is rough and uneven, which often causes the copper glue to flow and spread to the entire surface of the parts during the copper brazing process. Because copper is easily oxidized in the air to form a large amount of patina, affecting Product appearance, leading to customer complaints

Images