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A Short Note About Aluminum Welding
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Posted On :
May-13-2011
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Article Word Count :
504
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In emerging technology ,adjustable output frequency have been a pivotal role that has made the GAS TUNGSTEN WELDING(GTAW) it is designed and adapt only for aluminum application welding.
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Specifically after the introduction of advent of inverter on GTWA machines. Advanced and newly profiled based machines gives the welders the chance and possibility to enhance the bead profile shaping and also the frequency control by the new welding machine .A broader arc cone is produced when frequency is decreasing, in turn it also widen the weld bid profile and more over removing the impurities from the surface of the metal is done very effectively. This also helps in transferring the maximum amount of energy in the work piece. A tight focused arc cone is produced by increase in frequency. This narrow the weld bead and helps in deeper penetration which is mostly used when welding is done on corners, fillet welds or on root passes.
TIG WELDERS of AC conventional have a output fixed of 50 or 60 Hz, but there few inverters who provides option to the welders in adjusting the welding output frequency. The operators make use of this frequency adjusting option.
Referring to alternating current (AC) and GTAW means the number of electric cycle completes one full cycle per second which is measured in the terms of hertz. sine wave is represented as frequency which estimates the current flow of rising and falling as in there reverse direction.
Gas tungsten arc welding (GTWA) 0r the tungsten insert gas (TIS) welding is an important welding process. It is the most widely teamed welding process which is very difficult to master it. New arc control and wave form option made the operators work easier with the AC GTWA inverters for operators to bring in fashion arc characters, weld bead profile, weld puddle behavior, penetration and lastly appearance non ferrous material cannot be used with direct current (dc) because on the base material only forms the surface with DC electrode negative (DCEN) GTWA from the tungsten electrode the current flow to the work surface, therefore the electrodes passed are nothing but the positively charged argon gas ions flow to the tungsten from the work surface.
With ferrous metals which is principally steel is mostly works well with DCEN. Welding becomes difficult when aluminum is melted at a higher temperature than the metal provided the oxide layer that forms on non ferrous metals like aluminum he oxide problem saved by the direct control electrode positive (DCEP) in an different way because the flow of current to the tungsten from the work surface, lifting away the oxide away from the material in the arc zone.
Most of the inverter of all ranges is available, the inerter based sources gives us frequency of AC output ranging from between 20-400 Hz and 150 Hz. AC output frequency between 20 to 400 Hz is provided by the millers TIG machine inverter there are many companies who offer machines of all ranges like from 20 to 100 Hz where as others do supply machine having frequency with 20 to 400 Hz. For aluminum welding, generally 120 to 200 Hz is the most suitable frequency.
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Article Source :
http://www.articleseen.com/Article_A Short Note About Aluminum Welding_62085.aspx
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Author Resource :
For More information on Arc welder, Tig welder and Plasma cutters, you can visit our welders site everlastwelds.com.au
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Keywords :
Tig welder, welding machines, welder, plasma cutter, portable welding screen ,
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