Carbon dioxide shielded welding machine on the 2T4T in the 2T is manual, that is, to always press the switch welding, 4T is semi-automatic, that is, press is the arc, release is automatic welding, and then press is to close the arc.
Carbon dioxide shielded arc welding full name of carbon dioxide gas shielded arc welding. The shielding gas is carbon dioxide (sometimes a mixture of CO2 + Ar gas), 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, usually requires the use of short-circuiting and melting droplets 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 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.
Expanded:
Cold welding machine for the intelligent repair machinery and equipment products, is for the majority of the mold industry, foundry industry, electrical appliances manufacturing industry, medical equipment, automotive, shipbuilding, boilers, construction, Steel structure, bridge construction and other industries improved production, has a wide range of applicability. In the domestic is the majority of small and medium-sized enterprises preferred repair equipment.
Principle of repair: Intelligent cold welding machine is through the microelectric instantaneous discharge generated by the high thermal energy will be special welding wire fusion to the damaged parts of the workpiece, and the original substrate firmly fused, after welding only after little grinding and polishing post-processing.
Working Principle: Intelligent Repair Cold Welder is based on the principle of using a charging capacitor to transition the molten metal in an isoionized state to the surface layer of the workpiece in a metallurgical manner with a cycle of 10-3 to 10-1 seconds. Surfacing to the surface of the workpiece coating or cladding layer, due to the alloying effect with the base material, diffusion to the interior of the workpiece, fusion infiltration, the formation of a diffusion layer, and get a high-strength bond.
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 to the outside world through the basic body of the workpiece, so there is no heat buildup in the processed part of the workpiece. The temperature of the electrode tip can reach about 25,000°C due to instantaneous melting, even though the workpiece is heated almost at room temperature.
Baidu Encyclopedia - Carbon Dioxide Shielded Welding