Welding robots are widely used. Industrial robots and complete sets of automation equipment are key equipment in the production process, which can be used in manufacturing, installation, testing, logistics and other production links. They are also widely used in many industries, such as automobile and auto parts, engineering machinery, rail transit, low-voltage electrical appliances, electric power, IC equipment, military industry, tobacco, finance, medicine, metallurgy, printing and publishing, etc.
Three welding methods
1. Gas shielded arc welding:
Argon arc welding using argon as the shielding gas in the welding area and carbon dioxide arc welding using carbon dioxide as the shielding gas in the welding area are all gas shielded arc welding.
The basic principle is that when welding with the arc as the heat source, the protective gas is continuously sprayed from the nozzle of the spray gun to isolate the air from the molten metal in the welding area, so as to protect the liquid metal in the arc and welding pool from the pollution of oxygen, nitrogen, hydrogen, etc. in the atmosphere, so as to improve the welding quality.
2. TIG welding:
The metal tungsten rod with high melting point is used as an electrode to generate electric arc during welding and is also used for arc welding under argon protection. It is often used for welding of stainless steel, superalloy and other strict requirements.
3. Plasma arc welding:
A welding method developed from tungsten argon arc welding. Plasma arc is a kind of high temperature ion gas stream generated by ionization of ion gas, which is sprayed from the nozzle hole and compressed to form a slender arc column, which is higher than the conventional free arc, such as argon arc welding, which is only up to 5000-8000K. Plasma arc has a wide range of applications in the welding field because of its slender arc column and high energy density.
Three kinds of gas shielded welding
Arc welding robots mostly use gas shielded welding methods (MAG, MIG, TIG). The conventional welding power sources such as thyristor type, inverter type, waveform control type, pulse or non-pulse type can be installed on the robot for arc welding. Since the robot control cabinet adopts digital control, while the welding power supply is mostly analog control, an interface needs to be added between the welding power supply and the control cabinet.
In recent years, foreign robot manufacturers have their own specific supporting welding equipment, which has been seeded with corresponding interface boards, so there is no additional interface box in the arc welding robot system above.
It should be pointed out that the arc time accounts for a large proportion in the work cycle of the arc welding robot. Therefore, when selecting the welding power supply, the capacity of the power supply should generally be determined according to the duration of 100%.
1. MIG welding (GMAW):
This welding method uses the burning arc between the continuously fed welding wire and the work piece as the heat source, and the gas from the welding torch nozzle protects the arc for welding. The inert gas is generally argon.
2. TIG welding (inert gas tungsten arc welding):
The heat source of TIG welding is DC arc, the working voltage is 10-15V, but the current can reach 300A. The work piece is used as the positive electrode, and the tungsten electrode in the welding torch is used as the negative electrode. The inert gas is generally argon.
3. MAG welding (GMAW):
MIG welding uses a certain amount of active gases, such as O2 and CO2, to be added into the inert gas as the shielding gas.