Steps of copper pipe welding
1: Prepare all kinds of welding equipment, check whether the number of gases in the oxygen cylinder and ethyl cylinder meets the requirements, and check whether the connection line of the equipment meets the requirements of use.
2: Welding personnel to do a good job of personal protection.
3: open the valve of the gas bottle, adjust the oxygen pressure reducer to control the outlet pressure, the value of the pressure is about 0.2 MPa, adjust the pressure reducer of the ethyl block, the pressure is between 0.01 and 0.025 MPa.
4: Open the regulating valve of the ethyl gas, first slowly for ignition, and according to the material of the copper tube for the size of the adjustment, the size of the flame can be moderate.
5: Open the oxygen regulating valve, so that the combustion flame is moderate, showing a neutral flame can be.
6: The flame center of the flame from the soldered copper 4 mm or so, and the pipe perpendicular to the soldering place for heating, until the color of the copper pipe becomes dark red.
7: Apply brazing flux and heat it until the solder is fully melted and can evenly fill the welding seam.
8: Remove the flame and fix the soldered parts so that there is no misalignment between the two copper tubes soldered.
9: Close the valves of the ethylene gas and oxygen, and loosen the value of the pressure reducer.
10: Check the welding situation, organize tools, clean up the scene.
Copper pipe welding problems
1: welding deformation
In order to ensure the quality of purple copper pipe welding, it is necessary to connect in the high temperature of the flame, in the welding, due to operational reasons, the purple copper pipe is prone to deformation, which leads to a reduction in the sealing performance of the connection of the purple copper pipe.
2: produce air holes
Due to the thermal conductivity of copper material value is large, the crystallization rate of the welding seam will be relatively fast, high temperature state, melted into the molten pool of a large number of hydrogen can not be excluded in time, in the surface of the copper pipe will form a variety of different sizes of hydrogen air.
Under the action of high temperature oxidation, copper will be oxidized, the formation of copper oxide, due to water vapor is not soluble in copper, the molten pool of the clean speed, when the water vapor can not be evaporated in time, it will be in the inner formation of air holes.
3: the formation of cracks
In the welding process, due to the large welding stress, and due to the large amount of heat input, will be formed in the welded joints in the form of large column shape crystals, in the copper pipe contains other substances, will be formed in the crystals at the crystal of the low melting point of the crystals, in the junction of high temperature and low temperature will be a localized cracking situation.
