Flame brazing process, precautions for welding process
Release time:
2022-11-18
【Summary Description】 Flame brazing uses an oxyacetylene neutral flame to heat the base metal and the solder. During brazing, in order to ensure the relative position of the welded parts, use the vise on the pre-assembly platform for positioning and pre-assembly. Before brazing, chamfer the copper pipe joints, remove burrs, and then wipe the copper pipes and pipe fittings to be welded with acetone to clean the surface oil. During brazing, the distance between the welding nozzle and the base metal should be controlled at 30~70mm, and the entire joint area should be heated, and the heating time should be shortened as much as possible. When the copper tube is heated to dark red, the silver brazing filler metal is dipped in the end of the silver-based brazing filler metal and placed in the place to be brazed. The wire ends are heated to melt and flow along the joint gap. Continue to heat the joint and continuously add solder to fill the joint gap. At the same time, the flame should move back and forth evenly along the joint until a smooth brazed seam is formed. In the brazing process, the shaking of the workpiece should be reduced as much as possible to reduce the occurrence of defects. If the brazing position is not good, you can put a mirror on the back to observe the brazing seam. After brazing, the appearance of the brazed joint shall be observed. For poorly formed or suspected to have pores in the brazing seam, should be reheated, if necessary, can be filled with solder. After brazing, chemical cleaning is carried out, and the brazing samples before and after cleaning are shown in Figure 1. There are many residual flux and discoloration on the surface of the copper pipe before cleaning. After cleaning, the surface of the copper pipe is smooth and the cleaning effect is remarkable.
Flame brazing uses an oxyacetylene neutral flame to heat the base metal and the solder. During brazing, in order to ensure the relative position of the welded parts, use the vise on the pre-assembly platform for positioning and pre-assembly.
Before brazing, chamfer the copper pipe joints, remove burrs, and then wipe the copper pipes and pipe fittings to be welded with acetone to clean the surface oil.
During brazing, the distance between the welding nozzle and the base metal should be controlled at 30~70mm, and the entire joint area should be heated, and the heating time should be shortened as much as possible. When the copper tube is heated to dark red, the silver brazing filler metal is dipped in the end of the silver-based brazing filler metal and placed in the place to be brazed. The wire ends are heated to melt and flow along the joint gap. Continue to heat the joint and continuously add solder to fill the joint gap. At the same time, the flame should move back and forth evenly along the joint until a smooth brazed seam is formed.
In the brazing process, the shaking of the workpiece should be reduced as much as possible to reduce the occurrence of defects. If the brazing position is not good, you can put a mirror on the back to observe the brazing seam. After brazing, the appearance of the brazed joint shall be observed. For poorly formed or suspected to have pores in the brazing seam, should be reheated, if necessary, can be filled with solder.
After brazing, chemical cleaning is carried out, and the brazing samples before and after cleaning are shown in Figure 1. There are many residual flux and discoloration on the surface of the copper pipe before cleaning. After cleaning, the surface of the copper pipe is smooth and the cleaning effect is remarkable.
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