TIG, MIG, MAG Welding Comparison

1. TIG welding generally involves holding the welding torch in one hand and the welding wire in the other, 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 torch through the automatic wire feeding mechanism, which is suitable for automatic welding, of course, it can also be used manually.

3. The main difference between MIG and MAG lies in the protective gas. The equipment is similar, but the former is generally protected by argon and is suitable for welding non-ferrous metals; the latter is generally mixed with carbon dioxide active gas in argon and is suitable for welding high-strength steel and high-alloy steel.

4. TIG and MIG are both inert gas shielded welding, commonly known as argon arc welding. The inert gas can be Ar or He, but Ar 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 MIG welding (Melting Inert Gas Welding)  English: metal inert-gas welding uses a molten electrode. The arc welding method in which the external gas is used as the arc medium and protects the metal droplet, the welding pool, and the high-temperature metal in the welding zone is called MIG. The inert gas (Ar or He) shielded arc welding method with solid wire is called MIG welding.

1

MIG welding is the same as TIG welding except that a metal wire is used instead of the tungsten electrode in the welding torch. Therefore, the welding wire is melted by the arc and sent into the welding zone. The electric drive roller feeds the welding wire from the spool into the welding torch according to the welding requirements, and the heat source is also a DC arc. But the polarity is exactly the opposite of that used in TIG welding. The shielding gas used is also different, and 1% oxygen should be added to the argon to improve the stability of the arc. Like TIG welding, it can weld almost all metals, especially suitable for welding 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.

2

TIG welding (Tungsten Inert Gas Welding), also known as non-melting extremely inert gas welding. TIG welding is the most commonly used welding method whether it is manual welding or automatic welding of stainless steel with a thickness of 0.5 to 4.0 mm. The method of adding filler wire with TIG welding is often used in the bottom welding of pressure vessels because the airtightness of TIG welding can reduce the pores of the weld during pressure vessel welding.

The heat source of TIG welding is a direct current arc, the working voltage is 10 to 95 volts, but the current can reach 600 amperes. The correct connection method of the welding machine is to connect the workpiece to the positive pole of the power supply, and the tungsten pole in the welding torch serves as the negative pole. The inert gas is generally argon, which is fed through the welding torch to form a shield around the arc and the weld pool. To increase the heat input, 5% hydrogen is generally added to the argon. However, when welding ferritic stainless steel, hydrogen cannot be added to argon. The gas consumption is about 3-8 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 necessary, the weld pool can be filled with wire with the same composition as the austenitic material to be welded. When welding ferritic stainless steel, type 316 filler is usually used. Due to the protection of argon, the harmful effect of air on molten metal can be isolated, so TIG welding is widely used in welding. Easily oxidized non-ferrous metals such as aluminum, magnesium and their alloys, stainless steel, high-temperature alloys, titanium and titanium alloys, and refractory active metals (such as molybdenum, niobium, zirconium, etc.), and ordinary carbon steel, low alloy steel, etc. For materials, TIG welding is generally not used except for occasions that require high welding quality.

3

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Post time: Dec-17-2021