Copper pipe gas welding materials and preparation work include welding wire, organic flux, cleaning tools, etc.
1. Welding wire should be used as filler metal in gas welding of welding wire; one is the welding wire containing deoxidizing elements, such as wire 201 and 202; the other is the general cut of copper wire and base metal, using gas agent 301 as flux. Neutral flame should be used in gas welding of copper.
2. Gas welding flux is the flux used in gas welding. Its function is to protect the molten pool metal, remove the oxide formed in the welding process, and increase the fluidity of liquid metal. In addition to low carbon steel, other metal materials (such as cast iron, stainless steel, heat resistant steel, copper, aluminium, etc.) must be welded with gas flux.
3. Before brazing, the workpiece surface must be carefully cleared of oxides, grease, dirt and paint on the workpiece surface, and the rust and oil stains within 10 mm on both sides of the weld seam should be removed. The surface of the weld seam can be polished with a file, metal brush and sandpaper to remove the oxide film on the workpiece surface. Because the melted filler metal can not wet the surface of the parts that have not been cleaned, nor can it fill the gap between the joints.
4. Oil pollution can be removed by organic solvents such as alcohol, carbon tetrachloride, gasoline, trichloroene, dichloroethane and trichloroethane. Copper and copper alloy parts can be cleaned in a solution of 50g sodium phosphate and 50g sodium bicarbonate plus 1L water at a solution temperature of 60-80 degrees. Copper Pipe Gas Welding Materials, When the surface of the part can be completely wetted by water, it shows that the grease on the surface has been removed.
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