Differences between TIG, MIG and MAG welding
1. TIG welding is generally a hand-held welding torch and the other hand-held welding wire, which is suitable for manual welding of small-scale operations and repairs.
2. For MIG and MAG, the welding wire is sent out from the welding gun through the automatic wire feeding mechanism, which is suitable for automatic welding, of course, it can also be used manually.
3. The difference between MIG and MAG is mainly in the protective gas. The equipment is similar, but the former is generally protected by argon gas, which is suitable for welding non-ferrous metals; the latter is generally mixed with carbon dioxide active gas in argon gas, which is suitable for welding high-strength steel and high-alloy steel.
4. TIG and MIG are inert gas shielded welding, commonly known as argon arc welding. The inert gas can be argon or helium, but argon is cheap, so it is commonly used, so inert gas arc welding is generally called argon arc welding.
Comparison of MIG welding and TIG welding
Comparison of MIG welding and TIG welding MIG welding (metal inert-gas welding) English: metal inert-gas welding uses a melting electrode.
The arc welding method that uses external gas as the arc medium and protects the metal droplet, the welding pool and the high temperature metal in the welding zone is called gas metal arc welding.
The inert gas (Ar or He) shielded arc welding method with solid wire is called MIG welding, or MIG welding for short.
MIG welding is the same as TIG welding except that the tungsten electrode in the torch is replaced by a wire. Therefore, the wire is melted by the arc and fed into the welding zone. Electrically driven rollers feed the wire from the spool to the torch as required for welding, and the heat source is also a DC arc.
But the polarity is the opposite of that used in TIG welding. The protective gas used is also different. 1% oxygen should be added to the argon to improve the stability of the arc.
Like TIG welding, it can weld almost all metals, and is especially suitable for welding materials such as aluminum and aluminum alloys, copper and copper alloys, and stainless steel. There is almost no oxidation burning loss during the welding process, only a small amount of evaporation loss, and the metallurgical process is relatively simple.
TIG welding (Tungsten Inert Gas Welding), also known as non-melting inert gas shielded tungsten welding. Whether it is manual welding or automatic welding of stainless steel with a thickness of 0.5 to 4.0 mm, TIG welding is the most commonly used welding method.
TIG welding with filler wire is often used for bottom welding of pressure vessels, because the better air tightness of TIG welding can reduce the porosity of the weld seam during welding of pressure vessels.
The heat source of TIG welding is a DC arc, the working voltage is 10 to 95 volts, but the current can reach 600 amps.
The correct connection method of the welding machine is that the workpiece is connected to the positive pole of the power supply, and the tungsten pole in the welding torch is used as the negative pole.
The inert gas, typically argon, is fed through the torch to form a shield around the arc and over the weld puddle.
To increase the heat input, 5% hydrogen is typically added to the argon. However, when welding ferritic stainless steel, hydrogen cannot be added in argon.
Gas consumption is about 3 to 8 liters per minute.
In the welding process, in addition to blowing inert gas from the welding torch, it is better to blow the gas used to protect the back of the weld from under the weld.
If desired, the weld puddle can be filled with wire of the same composition as the austenitic material being welded, and when welding ferritic stainless steels, Type 316 filler is usually used.
TIG welding is widely used for welding due to the protection of argon gas, which isolates the harmful effects of air on the molten metal.
Non-ferrous metals such as aluminum, magnesium, etc., which are easily oxidized, and their alloys, stainless steel, high-temperature alloys, titanium and titanium alloys, and refractory active metals (such as molybdenum, niobium, zirconium, etc.) Materials, except for occasions with high requirements on welding quality, TIG welding is generally not used.
Post time: Aug-09-2022