In addition to argon arc welding, you can also try cold welding machine, which does not deform, change color, generate stress or locally anneal.
What tools are used to weld aluminum plates?
1 aluminum is one of the most difficult metal materials to weld. Ordinary arc welding can't weld at all, but it can't weld either. For example, special flux can be used for tin brazing, laser welding, argon arc welding, oxyacetylene gas welding, etc. Among them, argon arc welding is the easiest to operate, and other methods are rarely used in actual production except laser welding.
2 aluminum plate as shown in the figure below:
How to weld aluminum by several welding methods?
Welding methods of aluminum: Almost all kinds of welding methods can be used to weld aluminum and aluminum alloys, but aluminum and aluminum alloys have different adaptability to various welding methods, and each welding method has its own application. Gas welding and covered electrode arc welding equipment is simple and easy to operate. Gas welding can be used for repair welding of aluminum plates and castings with low requirements on welding quality. Covered electrode arc welding can be used for repair welding of aluminum alloy castings. Inert gas shielded welding (TIG or MIG) is the most widely used welding method for aluminum and aluminum alloys. Aluminum and aluminum alloy sheets can be welded by tungsten alternating current argon arc welding or tungsten pulse argon arc welding. Thick aluminum and aluminum alloy plates can be welded by tungsten-helium arc welding, argon-helium mixed tungsten gas shielded welding, MIG welding and pulsed MIG welding. Metal arc welding and pulsed metal arc welding (argon or argon/helium mixed gas) are widely used. Preparation before welding 1, cleaning before welding: when welding aluminum and aluminum alloy, the oxide film and oil stain on the surface of workpiece joint and welding wire should be strictly removed before welding; 2. Chemical cleaning Chemical cleaning has high efficiency and stable quality, and is suitable for cleaning welding wires and small-sized and mass-produced workpieces. There are two methods available: soaking and scrubbing. Organic solvents such as acetone, gasoline and kerosene. Oil stain can be removed from the surface, washed with 5% ~ 10% NaOH solution at 40℃ ~ 70℃ for 3 min~7 min (the time for pure aluminum is slightly longer but not more than 20 min), washed with flowing clean water, and then washed with 30%HNO3 solution at room temperature ~ 60℃ 1 min ~ 3 min. 3. Mechanical cleaning: Mechanical cleaning is often used when the workpiece is large in size and has a long production cycle, and it is polluted after multi-layer welding or chemical cleaning. Wipe the test surface with acetone, gasoline and other organic solvents to remove oil, and then brush it directly with a copper wire brush or a stainless steel wire brush with a diameter of 0. 15 mm ~ 0.2 mm until it shows metallic luster. Generally, it is not suitable to use grinding wheel or ordinary sandpaper to polish, so as to avoid defects such as slag inclusion caused by sand particles left on the metal surface and entering the molten pool during welding. In addition, scrapers and files can also be used to clean the surface to be welded. After cleaning, if the storage time is too long (such as more than 24 h), it should be reprocessed. 4. Gasket: The strength of aluminum alloy is very low at high temperature, and the fluidity of aluminum liquid is good, so the weld metal is easy to collapse during welding. In order to ensure penetration without collapse, backing plates are usually used to support the molten pool and nearby metals. The backing plate can be made of graphite plate, stainless steel plate, carbon steel plate, copper plate or copper rod. Arc grooves are formed on the surface of the backing plate to ensure the formation of the reverse side of the weld. One-sided welding and double-sided forming can also be carried out without backing plate, but advanced technological measures such as skilled welding operation or strict automatic feedback control of arc welding energy are needed. 5. Preheating before welding: Generally, thin and small aluminum parts do not need preheating. The preheating before welding can be carried out when the thickness is 10 mm ~ 15 mm, and the preheating temperature can be 100℃ ~ 200℃ according to different types of aluminum alloys, and it can be heated by oxyacetylene flame, electric furnace or blowtorch. Preheating can reduce the deformation and porosity of weldments. Post-welding treatment. Cleaning the flux and slag left in the weld and its vicinity after welding will destroy the passive film on the aluminum surface and sometimes corrode aluminum parts, so it should be cleaned up. Workpieces with simple shape and general requirements can be cleaned by simple methods such as hot water washing or steam blowing. For aluminum parts with high requirements and complicated shapes, brush them in hot water once, then soak them in 2% ~ 3% chromic anhydride aqueous solution or potassium dichromate solution for 5 min ~ 10 min at about 60℃ ~ 80℃, brush them with hard brush once, rinse them with hot water, oven dry them or dry them with hot air, or naturally dry them. 7. Post-weld heat treatment of aluminum containers generally does not require post-weld heat treatment.
What kind of covered electrode, welding and how to weld aluminum plates need to be taught.
If the objective conditions of deformation or gas are not considered in aluminum plate welding, AC aluminum argon arc welding machine is recommended, which is also a common welding method.
If deformation and simpler welding method are considered, low temperature aluminum covered electrode WE53 solid aluminum welding wire can be used for flame gas welding, which is more suitable for welding ultra-thin aluminum plate. The thinner the welding, the better.
If it is a medium plate, it can be welded with aluminum electrode without argon arc welding machine and process, and the aluminum electrode can be welded with imported WEWELDING 555 aluminum electrode. There is a reference video for you to understand "the application of WE555 aluminum electrode in aluminum alloy welding".
If you don't understand, you can continue to ask
How to weld aluminum plate
1, completely possible, this is the choice of welding process.
2, aluminum and aluminum alloy welding process
Welding characteristics of aluminum and its alloys.
(1) aluminum is easily oxidized in air and during welding, and the generated alumina (Al2O3) has a high melting point and is very stable and difficult to remove. It hinders the melting and fusion of the base metal, and the oxide film has a large proportion, which is not easy to float out of the surface, and it is easy to produce defects such as slag inclusion, incomplete fusion and incomplete penetration. The oxide film on the aluminum surface and the adsorption of a large amount of water are easy to cause pores in the weld. Before welding, strict surface cleaning should be carried out by chemical or mechanical methods to remove the oxide film on its surface. Strengthen protection during welding to prevent oxidation. In TIG welding, AC power supply is selected and oxide film is removed by "cathode cleaning". In gas welding, flux for removing oxide film is used. Welding heat can be increased when welding thick plates. For example, helium arc has high heat, so it should be protected by helium or argon-helium mixture, or gas shielded welding with large metal electrode. In the case of DC connection, "cathode cleaning" is not needed.
(2) The thermal conductivity and specific heat capacity of aluminum and its alloys are more than twice that of carbon steel and low alloy steel. The thermal conductivity of aluminum is ten times that of austenitic stainless steel. In the welding process, a large amount of heat can be quickly conducted into the base metal. Therefore, when welding aluminum and aluminum alloys, more heat is unnecessarily consumed in other parts of the metal except the metal molten pool. This useless energy consumption is more obvious than steel bar welding. In order to obtain high-quality welded joints, concentrated energy and high-power energy should be used as much as possible, and sometimes technological measures such as preheating can be adopted.
(3) The linear expansion coefficient of aluminum and aluminum alloy is about twice that of carbon steel and low alloy steel. When aluminum solidifies, the volume shrinkage is large, and the deformation and stress of weldments are large. Therefore, measures to prevent welding deformation are needed. Shrinkage, porosity, thermal crack and high internal stress are easy to occur when aluminum welding pool solidifies. In production, measures such as adjusting welding wire composition and welding process can be taken to prevent hot cracks. Al-Si alloy welding wire can be used to weld aluminum alloys other than Al-Mg alloy if corrosion resistance allows. When the content of silicon in Al-Si alloy is 0.5%, the tendency of hot cracking is greater. With the increase of silicon content, the crystallization temperature range of the alloy becomes smaller, the fluidity is significantly improved, the shrinkage rate is reduced, and the hot cracking tendency is correspondingly reduced. According to the production experience, when the silicon content is 5% ~ 6%, there will be no hot cracking, so the welding wire containing SAlSi strip (silicon content is 4.5% ~ 6%) will have better crack resistance.
(4) Aluminum has strong reflection ability to light and heat, and there is no obvious color change when it is in solid-liquid transition state, so it is difficult to judge when welding. The strength of high-temperature aluminum is very low, so it is difficult to support the molten pool and easy to weld through.
(5) Aluminum and aluminum alloys can dissolve a lot of hydrogen in liquid state, but hardly dissolve hydrogen in solid state. In the process of solidification and rapid cooling of welding pool, hydrogen is too late to overflow, which is easy to form hydrogen holes. The moisture in the arc column atmosphere, the moisture absorbed by the welding material and the oxide film on the surface of the parent metal are all important sources of hydrogen in the weld. Therefore, the source of hydrogen should be strictly controlled to prevent the formation of pores.
(6) Alloy elements are easy to evaporate and burn, which reduces the welding performance.
(7) When the parent metal of the parent metal is deformed or solution aged, the welding heat will reduce the strength of the heat affected zone.
(8) Aluminum is a face-centered cubic lattice with no isomorphism, and there is no phase change during heating and cooling, so the weld grain is easy to be coarse, and it is impossible to refine the grain through phase change.
2. Welding method
Almost all kinds of welding methods can be used to weld aluminum and aluminum alloys, but aluminum and aluminum alloys have different adaptability to various welding methods, and each welding method has its own application occasions. Gas welding and covered electrode arc welding equipment is simple and easy to operate. Gas welding can be used for repair welding of aluminum plates and castings with low requirements on welding quality. Covered electrode arc welding can be used for repair welding of aluminum alloy castings. Inert gas shielded welding (TIG or MIG) is the most widely used welding method for aluminum and aluminum alloys. Aluminum and aluminum alloy sheets can be welded by tungsten alternating current argon arc welding or tungsten pulse argon arc welding. Thick aluminum and aluminum alloy plates can be welded by tungsten-helium arc welding, argon-helium mixed tungsten gas shielded welding, MIG welding and pulsed MIG welding. Metal arc welding and pulsed metal arc welding are widely used (argon or argon/helium mixture).
3. Welding materials
(1) welding wire
The selection of aluminum and aluminum alloy welding wire should not only consider the good welding process performance, but also make the tensile strength and plasticity (through bending test) of butt joint meet the requirements according to the requirements of container. & gt
How to weld aluminum plate by gas welding?
It is recommended to find a master to teach, because it can't be taught in a few words. Without many years of welding experience, it is difficult to operate aluminum plate welding well. If you want to practice by yourself, you can repeatedly adjust the firepower with a welded handle and practice with a coke bucket, so that the aluminum plate will not melt around. After you know how to do it, practice cutting with a diameter of less than 2 mm, and keep it above 100 mm, with no difference in width. Then use covered electrode welding, even if there is no water leakage, the practice is basically qualified. The trick of welding aluminum plate is to adjust the fire repeatedly, and the hand is quick and the eye is quick. There are also the use skills of flux aluminum welding powder.
How to weld aluminum plate and aluminum tube
Hello, the welding of aluminum tube and aluminum plate is a special operation and process. WEWELDING53 low-temperature aluminum welding wire can weld the base material of any aluminum material at the temperature of 380-400 degrees, and it is very easy for beginners to weld aluminum without welding powder. If it is necessary to weld thin or small aluminum sheets, it is best to weld the parent metal with porous spray gun and combustion gas.
In what way can aluminum plates be welded? 40 points
There are many welding methods: electric welding, gas welding, argon arc welding, pulsed MIG and so on. Now the better methods are TIG (argon arc welding) and pulsed MIG (gas shielded welding).
How to weld 5 mm thick aluminum plate?
When welding aluminum plates with a thickness of 5 cm, AC argon arc welding will be considered first. For example, WEODING WSME3 15B aluminum argon arc welder will be used for welding, and the AC function will be turned on. According to the size of the aluminum plate, whether the aluminum plate is preheated or not will be selected. This is related to the size of the aluminum plate, not simply because of the thickness of the aluminum plate.
In terms of efficiency, aluminum double-pulse gas shielded welding machine can also be considered for welding, such as Viotin MIG500 double-pulse gas shielded welding machine, which has higher welding power, higher welding efficiency and greater heat input for large thick plates, but the preheating process is omitted when welding large thick plates. To do this, please refer to the operation video of Viotin MIG500 welding thick plate.
How to weld aluminum plates below 1mm?
1 A large current is needed to open the aluminum oxide film. As soon as the oxide film is opened, aluminum is so soft that hundreds of tripods will penetrate it. What's more, it is a 1 mm board.
2 welding: welding, which can also be written as "welding" or welding fusion, is a processing technology and connection method that two or more materials (the same or different) are heated, pressurized or both, so that two workpieces are combined with atoms. Welding is widely used, which can be used for both metals and nonmetals.