What is TIG pipe welding?

What is TIG pipe welding?

TIG welding (Tungsten Inert Gas Welding), also known as non-melting extremely inert gas shielded arc welding. Whether it is manual welding or automatic welding of 0.5 to 4.0mm thick stainless steel, 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 air tightness of TIG welding is better and can reduce the pores in the weld seam during pressure vessel welding. 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 electrode of the power supply, and the tungsten electrode in the welding torch is used as the negative electrode. The inert gas is usually argon.

Stainless steel welded pipes ,carbon steel tubes and cold drawn seamless tubing can be welded by TIG welding method.

How to TIG weld pipe?

TIG welding requires some special equipment. Mainly includes power supply, welding gun, tungsten electrode, gas nozzle, cable and gas cylinder. The power supply provides the required current and voltage, the welding gun is used to control the welding process, the tungsten electrode and gas nozzle play the role of conducting electricity and protecting the molten pool, the cable is used to connect the power supply and the welding gun, and the gas cylinder provides inert gas.

TIG welding operation steps

1. Preparation work: Clean the workpiece surface, adjust the welding machine parameters, and select the appropriate tungsten electrode and filling material.

2. Install the equipment: Connect the welding gun to the power supply and gas bottle, and install the tungsten electrode and gas nozzle.

3. Ignition: Press the power switch, move the welding gun close to the surface of the workpiece, touch the tungsten electrode, and form

arc.

4. Welding: Control the moving speed and welding angle of the welding gun to make the arc move evenly on the welding seam.

While moving, gradually add filling material.

Is MIG or TIG welding better for pipes?

Different welding methods are suitable for different pipes, and which method is suitable depends on the specific situation.

MIG welding (Melting Inert Gas Welding) is an arc welding method that uses a melting electrode and an external gas as the arc medium to protect the metal droplets, welding pool and high-temperature metal in the welding zone. It is called Melting Inert Gas Arc Welding. The inert gas (Ar or He) shielded arc welding method using solid wire is called molten extremely inert gas shielded welding, or MIG welding for short.

MIG vsTIG welding

1. Different methods

TIG welding is a welding method that uses pure Ar as the shielding gas and tungsten as the electrode.

MIG welding is a welding method that uses inert gases such as Ar as the main protective gas, including pure Ar or Ar gas mixed with a small amount of active gas for melting arc welding.

2. Different characteristics

TIG welding: Welding has a wide range of materials, including workpieces with a thickness of 0.6mm and above. The materials include alloy steel, aluminum, magnesium, copper and its alloys, gray cast iron, ordinary dry, various bronzes, nickel, silver, titanium and lead. The main areas of application are welding of thin and medium thickness workpieces.

MIG welding: MIG welding can be reversed with DC. It has good cathode atomization effect when welding aluminum, magnesium and other metals, which can effectively remove the oxide film and improve the welding quality of the joint. When welding aluminum and aluminum alloys, MIG welding can be used. The sub-jet droplet transfer method improves the quality of welded joints.

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