According to whether the electrode is melted or not and the shielding gas is different, it can be divided into non-melting electrode (tungsten electrode) inert gas shielded welding (TIG) and molten electrode gas shielded welding (GMA W). Oxidizing mixed gas shielded welding (MAG), CO2 gas shielded welding, tubular wire gas shielded welding (FCAW).

Composition of gas shielded welding equipment

Gas shielded welding is the use of gas as the arc medium and arc welding to protect the arc and welding area, called gas shielded arc welding, or gas shielded welding for short. A complete gas shielded welding equipment usually consists of welding power source, wire feeding system, welding torch, gas supply system, cooling water system and control system.

Second, the characteristics of gas shielded welding

1. The visibility of the arc and the molten pool is good, and the welding parameters can be adjusted according to the molten pool during the welding process.

2. The welding process is easy to operate, there is no slag or very little slag, and basically no slag removal after welding.

3. The arc heat is concentrated under the compression of the shielding airflow, the welding speed is faster, the molten pool is small, the heat affected zone is narrow, and the deformation of the weldment after welding is small.

4. Conducive to the mechanization and automation of the welding process, especially the mechanized welding of spatial locations.

5. It can weld magnesium, aluminum, titanium and their alloys which are chemically active and easy to form high melting point oxide film.

6. Can weld thin plates.

7. When working outdoors, a windshield device is required, otherwise the gas protection effect is not good, or even poor.

8. The light radiation of the arc is very strong.

9. Welding equipment is more complicated and more expensive than electrode arc welding equipment.

Three, safety precautions

In addition to the safety features of general manual arc welding, gas shielded welding must pay attention to the following points:

1. Gas-shielded welding has high current density, high arc intensity, high temperature, and high concentration of harmful gas generated under the action of high-temperature arc and strong ultraviolet rays, which can be as high as 4^-7 times that of manual arc welding, so special attention should be paid to ventilation.

2. The high-frequency oscillator used for arc ignition will produce a certain intensity of electromagnetic radiation, and contact with more welders will cause dizziness, fatigue, weakness, and palpitations.

3. Rare metals such as mu and persimmon in the tungsten electrode material used in argon arc welding are radioactive, especially when the electrode is ground, radioactive dust is formed, which is exposed to more and easily causes various welder diseases.