Difference: 1, the gas used is different: the former Ar gas, the latter CO2. 2, different uses. The former can be welded almost around the welded structure, the latter can not be used for pressure vessels. 3, the welding material is different: the former is divided into tungsten argon arc welding, fusion pole argon arc welding; the latter only fusion pole. 4, one is the electrode for the wire, and is constantly melting to fill the molten pool, the formation of the weld after condensation; the other is the use of shielding gases, along with the application of the technology of fusion pole argon arc welding, shielding gases have been developed by a single argon gas a variety of Widely used gas mixtures, such as argon or helium for the shielding gas is called fusion inert gas shielded arc welding (in the international abbreviation for MIG welding). 5, to inert gas and oxidizing gas (O2, CO2) mixture for the shielding gas, or CO2 gas or CO2 + O2 mixture for the shielding gas, collectively referred to as the fusion electrode active gas shielded arc welding (in the international abbreviation for MAG welding). 6, from the operation of the shielding gas, the shielding gas has developed from a single argon gas to a variety of gas mixtures. 6, from its mode of operation, the most widely used is the semi-automatic melting pole argon arc welding and argon-rich mixed gas shielding welding, followed by automatic melting pole argon arc welding. Advantages and disadvantages: ① fusion electrode inert gas shielding welding: argon or helium as a shielding gas. Inert shielding gas does not participate in the metallurgical reaction of the molten pool, suitable for a variety of high quality requirements or easy to oxidize metal materials, such as stainless steel, aluminum, titanium, zirconium, etc. welding, but at a higher cost. ② Carbon dioxide gas shielded welding: carbon dioxide as a shielding gas. Carbon dioxide at high temperatures will decompose oxygen into the molten pool, so it is necessary to add an appropriate amount of manganese, silicon and other deoxidizers in the wire. The main advantage of this protection welding is lower cost, but can only be used for carbon steel and low alloy steel welding. ③ mixed gas shielded welding: shielding gas to argon as the main, add the appropriate amount of carbon dioxide (15 ~ 30%) or oxygen (0.5 ~ 5%). Compared with carbon dioxide gas shielded welding, this shielding welding welding specification is wider, better shaped, better quality; compared with the melting pole inert gas shielded welding, the molten pool is more active, better metallurgical reaction.
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CO2 shielded arc welding is known as carbon dioxide gas shielded arc welding. The shielding gas is carbon dioxide (sometimes a mixture of CO2 + Ar), mainly used for manual welding. Due to the special effects of the thermophysical properties of carbon dioxide gas, the use of conventional welding power supply, the wire end of the molten metal is not possible to form a balanced axial free transition, it is usually necessary to use a short circuit and the droplet necking burst. Therefore, compared with the MIG welding free transition, more spatter. However, such as the use of high-quality welding machine, the right choice of parameters, you can get a very stable welding process, so that the spatter is reduced to a minimum. Due to the low price of the shielding gas used, the use of short-circuit transition when the weld is well formed, coupled with the use of deoxidizing flux-containing wire can be obtained without internal defects in the quality of the welded joints. Therefore, this welding method has become one of the most important welding methods for ferrous materials. Cold welding machine for intelligent repair machinery and equipment products, is for the majority of mold industry, foundry, electrical manufacturing, medical equipment, automotive, shipbuilding, boilers, construction, steel, bridge construction and other industries to improve the production, has a wide range of applicability. At home is the first choice of the majority of small and medium-sized repair equipment. Repair principle Intelligent cold welding machine is through the microelectric instantaneous discharge generated by the high heat energy will be special welding wire fusion to the broken parts of the workpiece, and the original substrate firmly fused, after welding only after very little grinding and polishing post-processing. Working Principle The principle of the intelligent repair cold welding machine is to utilize the charging capacitor to discharge the electrode with a cycle of 10-3~10-1 seconds and an ultra-short time of 10-6~10-5 seconds. The contact area between the electrode material and the workpiece will be heated to 8000~25000°C, and the molten metal in the state of plasma ionization transitions to the surface layer of the workpiece in a metallurgical way. The coating or cladding layer that is overlaid onto the surface of the workpiece diffuses into the interior of the workpiece due to alloying with the base material, fusion infiltration, and the formation of a diffusion layer, and a high-strength bond is obtained. Realization of cold welding The discharge time (Pt) is extremely short compared to the time between the next discharge (It), and the machine has enough relative stopping time for the heat to diffuse through the basic body of the workpiece to the outside world, so there is no heat buildup in the processed part of the workpiece. Although the workpiece heats up almost at room temperature, the temperature at the electrode tip can reach about 25,000°C due to instantaneous melting. Bonding Strength When the Intelligent Repair Cold Welder is used for repair overlay welding, why is the bonding strength so high when the heat input is low. This is because the electrode instantly produces molten metal droplets, which transition to the contact area with the base metal, and at the same time, due to the high temperature of the plasma arc, a strong diffusion layer is developed deep in the surface layer like a root. It shows high bonding and will not fall off. Advantage 1, reasonable design, free adjustment. According to the different metal materials can be selected from different files discharge frequency, in order to achieve the best repair effect. 2, the heat effect area is small. There is no heat input during the instantaneous process of cladding, so there is no deformation, biting edge and residual stress. Will not produce local annealing, repair does not need to re-heat treatment. 3, very small welding impact , the welding machine in the welding process to overcome the common argon arc welding on the periphery of the workpiece impact phenomenon. There is no margin of the workpiece processing surface can also be repaired. 4, repair high precision: surfacing thickness from a few microns to a few millimeters, only grinding, polishing. 5, fusion bonding strong high: due to the full penetration of the workpiece surface material to produce a very strong bonding force. 6, easy to carry: light weight (28 kg), 220V power supply, no working environment requirements. 7, economy: in the field to repair immediately to improve productivity and save money. 8, a machine multi-purpose repair. 9, a machine, a machine, a machine, a machine, a machine, a machine, a machine, a machine, a machine, a machine, a machine, a machine, a machine, a machine. 8、Multi-purpose machine: it can be used for surfacing, surface strengthening and other functions. By adjusting the discharge power and discharge frequency can obtain the required thickness of the surfacing and strengthening of the finish. 9, surfacing hardness and filler diversity: argon arc welding in the main circuit, auxiliary power supply, drive circuit, protection circuit and other aspects of the working principle is the same as the hand arc welding. No more description here, and focus on argon arc welding machine is unique to the control function and arc circuit function. Argon arc welding according to the different electrodes are divided into melting electrode argon arc welding and non-melting electrode argon arc welding two kinds. Non-melting pole Working principle and characteristics: non-melting pole tig welding is the arc in the non-melting pole (usually tungsten) and the workpiece between the combustion, in the welding arc around the flow of an inert gas (commonly used argon) does not react with the metal to form a protective gas mask, so that the tungsten end of the extreme part of the tungsten, the arc and the molten pool and the adjacent heat-affected zone of the high-temperature metal does not come into contact with the air, can prevent the oxidation and absorption of the ...