TIG welding (tungsten arc welding) of light weight aluminum alloy is to use a big amount of warm produced by the formation of an arc in between tungsten electrode and the work surface to thaw the aluminum product, and after that fill up the welding cable to obtain a company welding joint. The tungsten electrode and also weld location are shielded by inert gas from the nozzle to avoid response between the weld area as well as the surrounding air.
TIG welding appropriates for welding light weight aluminum alloy sheet with a density of much less than 3mm, its contortion is dramatically less than gas welding and also hand arc welding. Air Conditioner TIG welding cathode can successfully clean the oxide movie, without using change to prevent welding deposit and also slag rust. Its joint type is not limited, will certainly produce excellent joints forming and also bright look. The erosion of the welding component by argon gas sped up the cooling, enhanced the framework and performance of the joint, suitable for all-position welding.
Air Conditioning TIG welding and Air Conditioner pulsed TIG welding are the most typically utilized techniques for welding light weight aluminum alloys, adhered to by DC reverse TIG welding. Air Conditioner welding of aluminum alloy can attain the very best match in the existing lugging capacity, arc control as well as arc cleansing. When direct existing link (electrode link), warmth is generated on the surface of the workpiece as well as developing deep infiltration. Although rarely utilized DC reverse link (electrode positive) TIG welding approach to weld aluminum, yet this method is revealed effectively in continuous welding or fixing welding thin-walled warmth exchanger, pipe density listed below 2.4 mm, will certainly offer a great melting depth as well as arc very easy to control.
( 1) Tungsten electrode
Tungsten is the steel with the greatest melting factor.
Tungsten has a solid electron discharge capability at high temperature. When the tungsten electrode is added with the oxides of trace rare planet components such as thorium, cerium, zirconium, etc., the electron emission is dramatically reduced as well as the existing bring capability is enhanced. Throughout TIG welding of aluminum alloy, tungsten electrode is generally used to carry out present, ignites arc as well as keeps arc burning normally. Generally used tungsten electrode materials include pure tungsten, thorium tungsten as well as cerium tungsten.
Welding process specification
In order to obtain outstanding weld creating and also quality, according to the thickness of aluminum alloy plate, the welder should first choose tungsten electrode diameter and also form, welding cord size, shielding gas as well as circulation rate, nozzle aperture, welding existing, arc voltage and also welding rate, and then reasonably change the welding procedure parameters according to the real welding result. The main technical parameters of hand-operated TIG welding of light weight aluminum alloy include current, electrode, securing gas circulation price, tungsten electrode extension size, distance between nozzle and also workpiece, and so on. But also for automatic TIG welding, the arc voltage (arc length), welding rate and cable feeding speed are the most vital aspects.
Parameters of TIG aluminum alloy welding:
1) Nozzle aperture and protective gas flow.
The nozzle aperture of aluminum alloy TIG is 5 ~ 22 mm, as well as the protective gas circulation is usually 5 ~ 15L/min.
2) Tungsten electrode expansion size and the distance between nozzle as well as workpiece.
Tungsten extension length of butt weld is normally 5 ~ 6, fillet weld is typically 7 ~ 8. The distance from the nozzle to the workpiece is generally concerning 10 proper.
3) Welding current.
This relies on welding voltage, density, joint type, welding place and also welder ability.
Guidebook TIG welding making use of AC power supply, welding thickness of less than 6 aluminum alloy, the maximum welding current can be figured out according to the electrode size D according to the formula I= (60 ~ 65) D. The arc voltage is mostly determined by the arc length, which is normally about equal to the tungsten size.
4) Welding speed.
TIG welding of aluminum alloy ought to adopt faster welding speed in order to decrease deformation. The general manual WELDERMETALS INC. TIG welding speed is 8 ~ 12m/h; In automatic TIG welding, the welding speed is normally unchanged during the welding process after the specifications are established,.
5) The dimension of the aluminum alloy welding wire.
It is generally established by light weight aluminum plate density and welding present, and also the size of the welding cable is symmetrical to them.