pulser someone please answer

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I've been tigging for a while now and I'm starting to learn or really thin aluminum, soda cans and such, and i've been told that pulsars make life a lot easer but I can't find info about how to use them anywhere. it seems that everyone I talk to knows about them but no one can use them.So my ? is can anyone tell me what the adjustments do or where I could find info on pulsers. thanks
Reply:A search on google for "GTAW pulse" might help.  This article has some details:http://www.pro-fusiononline.com/feedback/pwt-aug99.htm-Heath
Reply:I agree this is a helpful web site concerning GTAW and calculations for pulsed, PGTAW settings.Just as a general explaination of PGTAW, instead of welding along at a constant current, the power supply is switching between a high current pulse, often called Peak current (Ipeak) for a programmed time (Tpeak) and a low current pulse often called Background current (Iback) for a programmed time (Tback).As an illustration of an exaggerated pulse, the following settings were used on a thin (0.050") stainless steel container, welded by machine at 6 inches per minute (IPM).  These settings produce a very controlled weld puddle that essentially consists of overlapping spot welds, which has the effect of precisely controlling weld width and depth, minimizing weld size and heat input, allowing vertical and overhead welding without puddle sagging.1.  Set Ipeak (150 A) for a very short time (0.08 sec) to produce a single melted spot of the desired size and depth.2.  Set Iback very low (5 A) enough to keep the arc going but not enough to do any melting, for a longer time (0.60 sec), to create a pause while moving the torch forward for the next peak pulse.The above example produces an average current of about 22 Amps, ((150x0.08)+(5x0.60))/(0.08+0.60)=22.  A constant current weld at this speed on this thickness may require roughly 50 amps and would generally have more variation in weld width/depth and appearance.On most machines, the settings are made in terms of Ipeak, % duty cycle, pulse frequency, and % background current, or similar such terms.% duty cycle = Tpeak/(Tpeak+Tback) = amount of time at peak.Pulse frequency (F) = pulses per second (Hz) = 1/(Tpeak+Tback).% background current = Iback/Ipeak, background current as a percent of peak.For the above example, this would be Ipeak=150A, % duty cycle=12%,F=1.5 Hz, and Iback = 3%.On thin materials, pulsing may be a big help as illustrated by the following example.  Consider trying to weld together the ends of two 0.035 steel wires.  If you precisely position the wires together, with the tungsten electrode held 0.03" away, and quickly hammer the foot control on and off, you create a single pulse of current that can nicely join the wires (depending on the current setting and duration of the foot pedal).  Now imagine trying to start the arc and slowly heat the wires, they each tend to melt and ball up away from each due to surface tension.  The rapid pulse however was able to melt the wires together "faster than the surface tension" trying to ball up the wire ends.Hope this helps
Reply:actual those both helped a lot now all i have to do is find the time to practice with the pulser. thank for the help