TIG welding (tungsten arc welding) of light weight aluminum alloy is to make use of a large quantity of warm produced by the development of an arc between tungsten electrode and also the work surface to thaw the aluminum material, and after that fill up the welding wire to get a firm welding joint. The tungsten electrode and also weld location are shielded by inert gas from the nozzle to stop response in between the weld location and also the surrounding air.
TIG welding appropriates for welding light weight aluminum alloy sheet with a thickness of less than 3mm, its contortion is dramatically less than gas welding as well as hand arc welding. Air Conditioning TIG welding cathode can efficiently clean the oxide film, without the use of flux to avoid welding residue and slag rust. Its joint kind is not limited, will generate good joints forming and also intense appearance. The disintegration of the welding part by argon gas increased the air conditioning, improved the framework and performance of the joint, appropriate for all-position welding.
A/C TIG welding and also A/C pulsed TIG welding are the most generally made use of methods for welding light weight aluminum alloys, adhered to by DC reverse TIG welding. AC welding of light weight aluminum alloy can accomplish the most effective match in the present bring ability, arc control as well as arc cleaning. When straight present connection (electrode connection), warmth is created externally of the workpiece as well as creating deep penetration. Although seldom used DC opposite link (electrode favorable) TIG welding technique to bond aluminum, however this method is revealed efficiently in continuous welding or fixing welding thin-walled warm exchanger, pipeline thickness listed below 2.4 mm, will offer a good melting depth and also arc simple to control.
( 1) Tungsten electrode
Tungsten is the metal with the greatest melting factor.
Tungsten www.weldermetals.com has a strong electron discharge capability at heat. When the tungsten electrode is included with the oxides of trace uncommon planet aspects such as thorium, cerium, zirconium, and so on, the electron emission is substantially reduced and also the current lugging capacity is improved. Throughout TIG welding of light weight aluminum alloy, tungsten electrode is primarily utilized to carry out present, stirs up arc as well as maintains arc burning generally. Commonly utilized tungsten electrode materials include pure tungsten, thorium tungsten and cerium tungsten.
Welding process criterion
In order to get excellent weld developing and high quality, according to the density of aluminum alloy plate, the welder should initially select tungsten electrode size and shape, welding cord diameter, protecting gas as well as flow price, nozzle aperture, welding current, arc voltage as well as welding speed, and then sensibly adjust the welding process criteria according to the real welding effect. The main technical specifications of manual TIG welding of light weight aluminum alloy include existing, electrode, protecting gas flow rate, tungsten electrode extension length, distance in between nozzle as well as work surface, etc. However, for automated TIG welding, the arc voltage (arc size), welding rate and also wire feeding rate are one of the most essential variables.
Parameters of TIG light weight aluminum alloy welding:
1) Nozzle aperture and also protective gas circulation.
The nozzle aperture of aluminum alloy TIG is 5 ~ 22 mm, and also the protective gas flow is typically 5 ~ 15L/min.
2) Tungsten electrode extension length as well as the distance in between nozzle as well as work surface.
Tungsten extension size of butt weld is usually 5 ~ 6, fillet weld is typically 7 ~ 8. The range from the nozzle to the work surface is usually concerning 10 appropriate.
3) Welding current.
This relies on welding voltage, thickness, joint type, welding place and also welder skill.
Handbook TIG welding utilizing Air Conditioner power supply, welding density of less than 6 aluminum alloy, the optimum welding current can be established according to the electrode diameter D according to the formula I= (60 ~ 65) D. The arc voltage is mainly established by the arc length, which is usually about equal to the tungsten diameter.
4) Welding speed.
TIG welding of aluminum alloy ought to adopt faster welding rate in order to decrease deformation. The general guidebook TIG welding rate is 8 ~ 12m/h; In automated TIG welding, the welding rate is usually unchanged during the welding procedure after the criteria are established,.
5) The size of the light weight aluminum alloy welding wire.
It is typically established by light weight aluminum plate density as well as welding current, and also the diameter of the welding cord is symmetrical to them.