Brass welding tools should be very numerous. Brass welding tools are necessary tools for welding copper pipes. Without the brass welding tool, the brass welding operation cannot be performed. This shows the importance of brass welding tools. Brass welding is a local rapid heating and cooling process. Brass welding is a maintenance. As we all know, there are many methods for copper pipe welding, including gas welding, arc welding, and tungsten arc welding. Different copper tube welding methods have different welding tools. So what are these copper tube welding tools and features? What about their structure? The following will follow me to understand the relevant knowledge of the brass welding.
Copper tube welding method
1. Copper gas welding method: Copper gas welding refers to the heat generated when combustible gas is combusted in oxygen, and the base metal is heated and soldered to achieve the connection.
2. Arc welding method for copper pipe electrodes: It refers to an arc welding method for manually welding electrodes. Arc welding refers to a welding method using an arc as a heat source.
3, copper tungsten argon arc welding method: tungsten argon arc welding is to use argon as a protective gas, tungsten electrode as a melting point, with the arc generated between the tungsten electrode and the weldment, heating the melting of the parent material (at the same time Adding wire is also melted) to achieve the welding method.
Copper tube welding method features
1, copper gas welding method features:
(1) Advantages of copper gas welding welding methods:
Good adaptability to welding of cast iron and certain non-ferrous metals;
Gas welding can play a greater role when welding is needed where electricity is insufficient.
(2) Disadvantages of copper gas welding welding methods:
Low production efficiency
The deformation and heat affected zone of the workpiece after welding are large.
It's harder to automate.
2, copper tube electrode arc welding method features:
(1) Advantages of the arc welding method of the copper tube electrode: good flexibility, easy operation, low assembly requirements before welding, and wide range of weldable materials;
(2) Disadvantages of the arc welding method of the copper pipe welding rod: The productivity is low; the human influence factor is strong.
3, copper tungsten argon arc welding method features:
(1) Argon gas has excellent protection, can effectively block the surrounding air; it does not react chemically with metal itself, nor dissolve in metal, making the metallurgical reaction in the welding process easy to control, so get higher quality The welds provide good conditions.
(2) Tungsten arc is very stable and stable combustion even under very low current conditions (<10a), especially for thin plate materials.
(3) The heat source and the filler wire can be separately controlled, so that the heat input is easily adjusted. This welding method can perform all-round welding and is also an ideal method for double-sided molding of single-sided welding.
(4) Since the filler wire does not pass current, no spatter is generated and the weld seam is beautifully molded.
(5) AC argon arc welding can automatically remove the oxide film on the surface of the weldment during welding. Therefore, it is possible to successfully weld non-ferrous metals with strong chemical reactivity such as aluminum, magnesium and alloys.
(6) The tungsten electrode is poor in carrying current. Excessive current will cause the tungsten electrode to melt and evaporate. The particles may enter the bath and cause tungsten trapping. Therefore, the deposition speed is small, the depth of penetration is shallow, and the productivity is low.
(7) The use of argon is more expensive, the deposition rate is lower, and the argon arc welding machine is more complicated. Compared with other welding methods (such as electrode arc welding, submerged arc welding, and gas shielded welding), the production cost is higher.
(8) The flow around the argon arc is greatly affected by the air flow and it is not easy to work outdoors.
Copper tube welding tool requirements
(1) Oxygen cylinder capacity 40L, working pressure 15MPa, appearance sky blue, black paint "oxygen". When conserving and using, it should be prevented from being contaminated with oil; it must be stable and reliable when placed, and should not be mixed with other cylinders; exposure, fire and knocking should not be allowed to prevent explosion. When oxygen is used, the oxygen in the bottle must not be used up completely, and at least 100 to 200 kPa should be left so that dust can be blown off and mixed in with other gases when oxygen is refilled.
(2) Acetylene bottle volume 40L, working pressure 1.5MPa. The appearance of white, red paint "acetylene", "not near the fire." The porous body filled with acetone in the bottle body allows acetylene to be stably stored safely in the bottle. When using acetylene bottles, in addition to observing the use of oxygen cylinders, it should also be noted that the temperature of the bottle body should not exceed 30~40°C; handling, loading, unloading, storage and use should be erected and stabilized, and it is forbidden to lay on the ground and For direct use, once you are going to use the acetylene bottle that has been lying down, you must stand still for 20 minutes and then use it after connecting the acetylene pressure reducer. Do not suffer severe vibration.
(3) The pressure reducer reduces the high pressure gas to a low pressure gas adjustment device. For gases of different natures, special pressure reducers must be selected to meet their respective requirements. Generally, the working pressure required for gas welding is generally low. For example, oxygen pressure is generally 0.2 to 0.4 MPa, and acetylene pressure is not to exceed 0.15 MPa. The gas pressure in the gas cylinder must be depressurized before it can be used. The function of the pressure reducer is to reduce the pressure of the gas and make the pressure of the gas delivered to the welding torch constant, so as to ensure the stable combustion of the flame. The pressure reducer should be firmly mounted on the dedicated cylinder. All kinds of gas pressure reducer are forbidden to use or replace.
(4) When the tempering fuse is normally gas welded, the flame is burned outside the tip of the welding torch, but when the gas supply is insufficient, the welding tip is blocked, the welding tip is too hot or the welding tip is too close to the weldment, the flame will follow the acetylene tube. The road burns back. The phenomenon of this kind of flame entering the nozzle and burning backward is called tempering. If the tempering spreads to the acetylene bottle, it may cause an explosion. The function of the tempering fuse is to trap the tempering gas and ensure the safety of the acetylene bottle.
(5) The role of torch torch is to evenly mix acetylene and oxygen in a certain proportion, which is sprayed by the welding torch, ignites and burns, and produces a gas flame. Various types of welding torches are equipped with 3~5 different size welding nozzles for use when welding different thickness weldments.
Copper tube welding technology
1. Welding of similar materials
1.1 Brazing of copper and copper can use phosphor bronze solder or phosphor bronze solder with low silver content, such as 2% or 5% silver base solder. This kind of solder is cheaper and has a good melt. It uses a caulking and wetting process and does not require flux.
1.2 The welding of steel and steel can use brass strip solder and appropriate flux. When soldering, the solder is heated to a certain temperature and inserted into the flux, so that the flux melts and adheres to the solder. However, after the welding, the weld must be near The residual flux is brushed clean to prevent corrosion.
2. Welding of different materials
2.1 Copper and steel or copper and aluminum can be welded with silver copper solder and appropriate flux, after welding, the residual flux near the welding mouth must be scrubbed with hot water or steam to prevent corrosion. In the use of flux is best diluted with alcohol into a paste, applied to the weld surface, the rapid evaporation of alcohol during the welding process to form a smooth film is not easy to lose, while also avoiding the danger of moisture into the refrigeration system.
2.2 Copper and iron can be welded using phosphor bronze solder or brass strip solder, but also need to use the corresponding flux, such as borax, boric acid or boric acid mixed flux. 3 welding operation of welding different materials, different diameters required welding torch size and flame temperature is different, the size of the flame when welding can be controlled through the two needle valve adjustment, flame adjustment is based on oxygen The volume ratio of acetylene gas can be divided into three kinds: carbonization flame, neutral flame and oxidation flame.
3, matters needing attention
Welding welding should strictly follow the steps to operate, otherwise it will affect the quality of welding.
The surface of the pipe to be welded is cleaned or flared. The flared flare should be smooth, round, free from burrs and cracks, and the thickness should be uniform. The copper pipe joints to be welded with sandpaper should be polished thoroughly and finally cleaned with a dry cloth. Otherwise, it will affect the flow of solder and the quality of soldering.
Copper tubes to be welded are inserted one above the other (attention size) and aligned with the center.
When welding, the workpiece must be warmed up. The flame is roasted on the hot copper tube. When the copper tube is heated to purple, the solder is moved away from the flame and the solder is fused to the weld. The solder melts and flows into the welded copper. The heated temperature can be reflected by the color. The temperature level.
Editor's summary: Pay attention to the flame when performing copper pipe welding. Welding flames include charring flames, neutral flames, and oxidizing flames. The nature of the flame is determined by the type of metal being welded and its properties. We should pay attention to the scientific and rational choice of use. Refrigerant and air conditioning pipe welding is generally used neutral flame.
Manual Tool Curtain Installation Common Tool Copper Tube Welding
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