Overview Gas shielded welding is a method of arc welding using an applied gas as a protective medium.
Features Gas shielded welding has the following characteristics compared to other welding methods:
(1) The visibility of the arc and the molten pool is good, and the welding parameters can be adjusted according to the condition of the molten pool during the welding process. Gas shielded welder
(2) The welding process is easy to operate, there is no slag or very little slag, and it is basically unnecessary to clean the slag after welding.
(3) The arc concentrates under the compression of the protective airflow, the welding speed is faster, the molten pool is smaller, the heat affected zone is narrow, and the weldment has little deformation after welding.
(4) Conducive to the mechanization and automation of the welding process, especially the mechanized welding of the spatial position.
(5) It is possible to weld magnesium, aluminum, chin and its alloys which are chemically active and easily form a high melting point oxide film.
(6) The thin plate can be welded.
(7) When working outdoors, a windshield device is required, otherwise the gas protection effect is not good or even poor.
(8) The optical radiation of the arc is very strong.
(9) Welding equipment is more complicated and is more expensive than electrode arc welding equipment.
Gas shielded welding classification Gas shielded welding is generally divided into non-melting pole (tungsten) inert gas shielded welding (TIG) and gas metal arc welding (GMA W) according to whether the electrode is melted and protective gas, and the gas metal arc welding includes Conditional gas shielded welding (MIG), oxidizing gas shielded welding (MAG), island gas shielded welding, tubular wire shielded welding (FCAW).
Gas shielded welding safety features In addition to the safety features of general manual arc welding, gas shielded welding should also pay attention to the following points:
(l) Gas shielded welding has high current density, high arc intensity, high temperature, and high concentration of harmful gas under high temperature arc and strong ultraviolet light, which can be as high as 4^-7 times of manual arc welding, so pay special attention to ventilation.
(2) The high-frequency oscillator used for arc ignition will generate electromagnetic radiation of a certain intensity. If you contact more welders, it will cause dizziness, fatigue, palpitations and other symptoms.
(3) The rare metals such as oysters and persimmons in the tungsten electrode materials used for hydrogen arc welding are radioactive, especially when the electrodes are polished, and the radiation is formed, which is likely to cause various welder diseases.
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