TIG welding (tungsten arc welding) of light weight aluminum alloy is to utilize a big amount of heat created by the development of an arc in between tungsten electrode and also the workpiece to melt the light weight aluminum product, and after that load the welding wire to acquire a company welding joint. The tungsten electrode as well as weld location are shielded by inert gas from the nozzle to avoid reaction in between the weld area and the surrounding air.
TIG welding appropriates for welding light weight aluminum alloy sheet with a thickness of much less than 3mm, its deformation is significantly much less than gas welding and also hand arc welding. AC TIG welding cathode can effectively cleanse the oxide movie, without the use of change to prevent welding residue and slag corrosion. Its joint form is not limited, will certainly create good joints creating and also bright appearance. The erosion of the welding part by argon gas accelerated the air conditioning, improved the structure as well as performance of the joint, suitable for all-position welding.
A/C TIG welding as well as Air Conditioning pulsed TIG welding are the most generally utilized techniques for welding aluminum alloys, adhered to by DC reverse TIG welding. AC welding of aluminum alloy can achieve the very best match in the existing lugging capacity, arc control and arc cleansing. When straight present link (electrode link), heat is generated externally of the work surface and also developing deep infiltration. Although hardly ever made use of DC opposite connection (electrode favorable) TIG welding technique to bond light weight aluminum, however this method is revealed properly in continual welding or fixing welding thin-walled warmth exchanger, pipe thickness below 2.4 mm, will offer a good melting deepness and arc easy to manage.
( 1) Tungsten electrode
Tungsten is the metal with the highest possible melting point.
Tungsten has a strong electron emission capacity at heat. When the tungsten electrode is included with the oxides of trace rare planet aspects such as thorium, cerium, zirconium, etc., the electron emission is considerably decreased and also the present lugging capacity is boosted. Throughout TIG welding of light weight aluminum alloy, tungsten electrode is mostly used to conduct current, sparks arc as well as keeps arc burning typically. Generally utilized tungsten electrode products consist of pure tungsten, thorium tungsten and also cerium tungsten.
Welding procedure criterion
In order to acquire outstanding weld developing and quality, according to the density of aluminum alloy plate, the welder ought to initially select tungsten electrode size and also shape, welding cable diameter, securing gas and circulation price, nozzle aperture, welding existing, arc voltage and also welding rate, and afterwards reasonably adjust the welding process criteria according to the real welding result. The major technical specifications of hands-on TIG welding of aluminum alloy consist of present, electrode, securing gas circulation price, tungsten electrode expansion size, distance in between nozzle and work surface, and so on. But for automated TIG welding, the arc voltage (arc size), welding rate and cord feeding speed are one of the most vital aspects.
Specifications of TIG aluminum alloy welding:
1) Nozzle aperture and also safety gas flow.
The nozzle aperture of light weight aluminum alloy TIG is 5 ~ 22 mm, and the safety gas circulation is generally 5 ~ 15L/min.
2) Tungsten electrode extension size and also the range between nozzle as well as workpiece.
Tungsten expansion length of butt weld is usually 5 ~ 6, fillet weld is generally 7 ~ 8. The range from the nozzle to the workpiece is normally about 10 ideal.
3) Welding current.
This depends on welding voltage, thickness, joint type, welding area as well as welder ability.
Manual WELDERMETALS.COM TIG welding utilizing Air Conditioner power supply, welding thickness of much less than 6 aluminum alloy, the optimum welding current can be determined according to the electrode size D according to the formula I= (60 ~ 65) D. The arc voltage is mostly figured out by the arc size, which is usually roughly equal to the tungsten size.
4) Welding rate.
TIG welding of light weight aluminum alloy ought to embrace much faster welding speed in order to decrease deformation. The general manual TIG welding speed is 8 ~ 12m/h; In automatic TIG welding, the welding speed is generally unchanged throughout the welding procedure after the criteria are established,.
5) The size of the light weight aluminum alloy welding cord.
It is usually identified by light weight aluminum plate density and welding current, and the diameter of the welding cable is symmetrical to them.
