TIG welding method, the difference between TIG welding and MIG welding

TIG Welding Skills - Many Masters Can't!

TIG welding (Tungsten Inert Gas Welding) and MIG welding (Metal Inert Gas Welding) are two common arc welding techniques, and their differences are as follows:

1.How it works:

TIG welding: TIG welding uses a tungsten electrode that does not consume and welds the metal material through the heat generated. The welding area is protected in an inert gas (e.g. argon) to prevent oxygen from reacting with the molten metal.

MIG welding: MIG welding uses a consumable metal wire that is automatically supplied to the weld area via a welding gun. The welding area is also protected by an inert gas to prevent oxygen from reacting with the molten metal.

2.Applicable Materials:

TIG welding: TIG welding is suitable for welding almost all metal materials, including steel, stainless steel, copper, nickel alloy, titanium, etc. It is particularly suitable for welding high-alloy, sheet and precision parts.

MIG welding: MIG welding is mainly suitable for welding more common metal materials, such as steel, stainless steel and aluminum. It is widely used to weld heavy structures and thick plates.

3.Welding speed and automation:

TIG welding: TIG welding is relatively slow and requires high welding skills and manual operation. It is commonly used in precision and high-quality welding processes.

MIG welding: MIG welding speed is fast, with high welding efficiency and degree of automation. It is often used in industrial manufacturing and high-volume welding.

4.Weld quality:

TIG welding: TIG welding produces high quality welds, neat welds, high strength, and fewer pores. It is suitable for applications that require high weld quality, such as aeronautics, nuclear power and precision instrument manufacturing.

MIG welding: MIG welding produces generally better weld quality, but there may be slightly higher weld porosity compared to TIG welding. It is suitable for applications such as general structural welding, automotive manufacturing, and metal processing.

It is necessary to select the appropriate welding method according to the specific welding needs, materials and application scenarios. For complex projects, it may be necessary to use a combination of TIG welding and MIG welding to make the most of them.

The difference between TIG welding and MIG welding is: TIG non-MIG inert gas arc welding, MAG welding is MIG-MAG welding, and TIG welding is often said to be TIG welding. Gas shielded welding belongs to MIG welding or MAG welding according to the type of shielding gas.

TIG welding: TIG welding and filling the silk Zaoling method is often used for the bottom welding of pressure vessels, because the air tightness of TIG welding is better, which can reduce the porosity of the weld during the welding of pressure vessels. The heat source of TIG welding is a DC arc with a working voltage of 10 95 volts, but currents up to 600 amps. The correct connection method of the welding machine is that the workpiece is connected to the positive electrode of the power supply, and the tungsten electrode in the welding torch is used as the negative electrode.

The inert gas is generally argon.

MIG welding uses a molten electrode, an applied gas as the arc medium, and protects the metal droplets, the weld pool, and the high-temperature metal in the welding area, which is called MIG/MAG arc welding. The inert gas (AR or HE) shielded arc welding method with solid core welding wire is called molten inert gas shielded welding, referred to as MIG welding.

TIG weldingIt is connected to the tungsten electrodeInert gasesWelding, generally known as non-MIG/MAG welding.

TIG welding (Tungsten Inert Gas Welding) is also known as tungsten tungsten shielded welding with shed laughter. When it comes to manual welding or automatic welding of thick stainless steel, TIG welding is more commonly used than it. The method of TIG welding and wire filling is often used for the bottom welding of pressure vessels, because the air tightness of TIG welding is better, which can reduce the porosity of the weld during pressure vessel welding.

Advantages of TIG welding:

The main advantage of the TIG welding method is that it can weld a large range of materials. Including workpieces with a thickness of or more, the material includes alloy steel.

Aluminum, magnesium, copper and its alloys, gray cast iron, various bronze, nickel, silver, titanium and lead. The main area of application is the welding of thin and medium-thick workpieces as root beads in thicker cross-sections.

TIG welding is also translated as non-MIG/MAG welding (TIG or GTAW for short).It is a gas shielded welding method using pure tungsten or activated tungsten electrode, using inert gas - argon as shielding gas, tungsten rod electrode only plays a conductive role without melting, and generates an arc between the tungsten electrode and the workpiece after being energized.

TIG Welding Process:

1. The inert gas is fed through the welding torch to form a shield around the arc and on the welding pool. To increase the heat input, 5% hydrogen is typically added to the argon. However, when welding ferritic stainless steels, hydrogenation inside argon cannot be made.

Gas consumption is about 3 8 liters per minute. In addition to blowing inert gas from the torch during the welding process, it is best to blow under the weld to protect the back side of the weld.

2. If necessary, the weld pool can be filled with the same welding wire as the austenitic material to be welded, and 316 type filler is usually used when welding ferritic stainless steel.

1. The difference between shielding gas: MIG welding is generally protected by argon; TIG is generally mixed with carbon dioxide reactive gas in argon.

2. Tungsten arc difference: TIG welding can still burn stably even at a small welding current (<10A); MIG welding does not use tungsten electrode, and the cost is lower than TIG welding.

3. Application difference: TIG welding is especially suitable for thin plate and ultra-thin plate material welding; MIG welding is suitable for welding materials such as aluminum and aluminum alloys, copper and copper alloys, and stainless steel.

TIG welding is tungsten argon arc welding. Tungsten TIG welding is often referred to as TIG welding.

It is an arc welding method that generates heat between a non-consumable electrode and a working object; The electrode rod, the bath, the arc and the working object are protected from atmospheric contamination by the gas state, which is a gas or gas mixture**, which must provide full protection, because even a very small amount of air contamination can contaminate the weld bead.

Principle:

TIG welding (tungsten argon arc welding) is made to pure.

AR is used as a shielding gas and tungsten electrode is used as a welding method. TIG welding wire is supplied in straight strips of a certain length (usually LM).

Inert gas shielded arc welding with pure tungsten or activated tungsten (thorium tungsten, cerium tungsten, zirconium tungsten, lanthanum tungsten) as non-melting electrode, using the arc between the tungsten electrode and the workpiece to melt the metal to form a weld. During the welding process, the tungsten electrode does not melt and only acts as an electrode. At the same time, argon or helium is fed into the nozzle of the welding torch for protection.

Additional metals can also be added as needed. It is commonly known as TIG welding in the world.

1. Non-MIG/MAG welding (TIG or GTAW) is also known as tungsten argon arc welding or tungsten inert gas shielded welding, which is a gas shielded welding method that uses pure tungsten or activated tungsten electrode and uses inert gas-argon as shielding gas. Wire filling can be done or not during the welding process. When filling the wire, the welding wire should be filled from the front of the tungsten electrode.

Tungsten TIG welding can be divided into manual welding and automatic welding, and manual tungsten TIG welding is widely used.

2. Characteristics of tungsten argon arc welding.

The advantages of tungsten TIG welding are: because the weld is well protected, the weld metal has high purity and good performance; The heating is concentrated during welding, so the deformation of the weldment is small; The arc stability is good, and the arc can also be stably burned at a small current (10A). Moreover, the welding process is easy to mechanize and automate.

The disadvantages are: argon is more expensive, and the cleaning requirements for weldments before welding are very strict. At the same time, due to the limited current-carrying capacity of tungsten electrode, the weld penetration depth is shallow, which is only suitable for welding thin plates (6mm) and ultra-thin plates.

In order to prevent the abnormal burning of tungsten electrode and avoid the defect of tungsten inclusion in the weld, the commonly used short-circuit arc striking method cannot be used, and a special non-contact arc striking method must be used.

TIG welding is mainly used to weld stainless steel and other alloy steels. At the same time, it can also weld aluminum, aluminum alloys, magnesium alloys and thin-walled parts without flux.