TIG welding (tungsten arc welding) of aluminum alloy is to make use of a large amount of heat produced by the development of an arc between tungsten electrode as well as the work surface to thaw the light weight aluminum material, and then fill up the welding cable to acquire a company welding joint. The tungsten electrode and also weld location are protected by inert gas from the nozzle to weldermetals.com prevent reaction between the weld location as well as the surrounding air.

TIG welding appropriates for welding aluminum alloy sheet with a thickness of less than 3mm, its contortion is considerably less than gas welding as well as hand arc welding. A/C TIG welding cathode can properly cleanse the oxide movie, without using change to prevent welding deposit as well as slag deterioration. Its joint kind is not restricted, will certainly generate good joints developing and brilliant look. The disintegration of the welding part by argon gas sped up the cooling, boosted the framework and also efficiency of the joint, appropriate for all-position welding.

AC TIG welding as well as AC pulsed TIG welding are the most typically made use of approaches for welding light weight aluminum alloys, complied with by DC reverse TIG welding. A/C welding of aluminum alloy can attain the most effective match in the existing carrying ability, arc control as well as arc cleaning. When direct present link (electrode link), warmth is created on the surface of the workpiece and developing deep infiltration. Although rarely utilized DC reverse link (electrode favorable) TIG welding approach to bond light weight aluminum, however this method is revealed successfully in continual welding or repair work welding thin-walled heat exchanger, pipe density below 2.4 mm, will certainly offer a good melting depth as well as arc very easy to control.

( 1) Tungsten electrode

Tungsten is the metal with the greatest melting point.

Tungsten has a strong electron exhaust capability at heat. When the tungsten electrode is included with the oxides of trace unusual planet components such as thorium, cerium, zirconium, and so on, the electron emission is significantly reduced as well as the current lugging capacity is improved. Throughout TIG welding of light weight aluminum alloy, tungsten electrode is primarily made use of to perform existing, stirs up arc and maintains arc burning generally. Frequently made use of tungsten electrode materials consist of pure tungsten, thorium tungsten as well as cerium tungsten.

Welding process specification

In order to obtain exceptional weld developing and also high quality, according to the thickness of light weight aluminum alloy plate, the welder ought to first choose tungsten electrode diameter as well as form, welding cord size, shielding gas and also flow price, nozzle aperture, welding current, arc voltage as well as welding rate, and then sensibly change the welding process criteria according to the real welding result. The primary technological criteria of hand-operated TIG welding of aluminum alloy consist of current, electrode, protecting gas flow rate, tungsten electrode expansion size, distance between nozzle and work surface, and so on. But also for automatic TIG welding, the arc voltage (arc length), welding rate as well as wire feeding rate are the most important aspects.

Specifications of TIG light weight aluminum alloy welding:

1) Nozzle aperture as well as protective gas circulation.

The nozzle aperture of aluminum alloy TIG is 5 ~ 22 mm, as well as the safety gas flow is typically 5 ~ 15L/min.

2) Tungsten electrode expansion size and also the distance in between nozzle as well as workpiece.

Tungsten extension length of butt weld is usually 5 ~ 6, fillet weld is generally 7 ~ 8. The range from the nozzle to the workpiece is usually regarding 10 proper.

3) Welding current.

This relies on welding voltage, thickness, joint kind, welding location and also welder skill.

Manual TIG welding using A/C power supply, welding density of much less than 6 aluminum alloy, the optimum welding current can be figured out according to the electrode diameter D according to the formula I= (60 ~ 65) D. The arc voltage is generally determined by the arc length, which is normally roughly equal to the tungsten size.

4) Welding speed.

TIG welding of aluminum alloy need to take on much faster welding speed in order to minimize contortion. The basic handbook TIG welding rate is 8 ~ 12m/h; In automated TIG welding, the welding speed is generally unchanged throughout the welding process after the specifications are established,.

5) The dimension of the light weight aluminum alloy welding cord.

It is usually determined by aluminum plate density and also welding present, and also the size of the welding wire is symmetrical to them.