Roadmyi,
I will be glad to answer and go through your questions so you can see how the difficult it is with giving specifics about welding settings. We are here to answer your questions...That is not a problem at all...all you need to do is ask specifically as best you can and I or Mike will detail the answers as best as possible...
So here goes.
1) Gas Flow Rate. Gas flow rate is entirely dependant upon metal type, amperage range, indoors or outdoors, weld position, weave technique(or the lack thereof) and operator skill , nozzle size and stick out. A good starting point is somewhere between 15 and 40 cfh(cubic feet per hour...there are metric converters on the web if you are using a lpm or lph gauge) depending upon these conditions. To determine exact setting necessary, set all other parameters on the machine, and then begin welding somewhere in that range. Gradually reduce the gas until you notice slight oxidation and minor pinholing of the weld. Gradually increase the gas flow until the discoloration of the weld dissapears,(dull gray steel begins to get shiny and the black sootiness is gone for the aluminum). When it dissappears, add 3-5 cfh to this to give insurance against drafts, fans or any unforseen condition that may cause the shielding gas to blow off the weld. If it is in out of position welding, remember the flow rate must be increased because Argon is heavier than air and sinks rapidly. In this case, a Helium/Argon Mix may be used and an additional cfh is needed if using HeAr for down hand welding if this gas is to be used exclusively without pure argon.
Personally, I get great results with 15-20 cfh in an enclosed shop on steel and with a number 6 welding cup and find that 25-35 cfh is necessary outside, sometimes 40 if there is a breeze. A larger cup will necessitate a larger gas flow. For the metric flow meters, the range should be about 5-20 lpm.
2) Ball Park amperage... Again, ballpark amperage depends upon metal type, position, weave technique and operator skill and electrode size and type and polarity. Amp The best welding charts center the amperage around the electrode size , composition, nozzle diameter, gas flow and not the metal thickness and are pages long. However, a ball park figure for a 1/16 thoriated tungsten with 15-20 cfh flow with argon in a down hand position with a pointed tip with DCEN is somewhere between 50-100 amps with a 3/8 inch nozzle size(internal) with a ER70S-3 1/16-3/32 filler rod. A 3/32 electrode with DCEN, sharpened to a point, with argon and 15-20 cfh with a 3/8 nozzle and a ER 70s-3 with argon is approximately 70-150 amps with 1/16-3/32 filler metal. A 1/8 inch electrode of same composition, pointed,with DCEN is good for 90-250 amps with 20-25 cfh with a 1/2 inch nozzle and 3/32-1/8 ER70S-3 filler rod with argon.
Now, with that said, if you change any one variable, the recommendation may change, particularly with Aluminum or Stainless.
There are "welding calculators" on the web, that will spoon feed the info to you, but they are notoriously inaccurate and can be off up to 30-40 percent because they do not take into account the limitless number of variables involved. I personally have to experiment briefly every time I weld to make sure that the settings are performing correctly before I begin welding...Also, keep in mind every machine and every brand welds with a different "sweet spot"...
3. Filler material selection has a endless number of variables involved including fitup, spec for the material being welded, desired finish, root gap, presence of back purging, joint prep, position , mill scale, oxidation and overall operator skill. If you can give me a specific question about your conditions and include as much information about the above conditions, I can help on a case by case issue...
4. The "flash" occurs sometime before puddle development. The operator's manual actually gives a good detail on how to start a weld...Slowly circle the torch once the arc is initiated, steadily but methodically, sweeping the electrode from edge to edge until the puddle "wets" in without EVER touching the base metal. Wetting in is a little difficult to explain until you see it. When you see it, its an AHA! moment and you will recognize it. Basically it is where you can drop a bead of filler metal onto the base material and it flows into the metal instead of standing on top of the metal. It flows like thick water and completely blends into the molten metal which is smoothly joined to the sides of the parent material. If a puddle won't "wet" in, increase amperage, change electrodes sizes (go down), or slow down your sweeping motion. Once the puddle begins to form a "kehole" like a skeleton key, where the metal begins to "open" up in the center slightly ahead of the weld pool and it has a nice little round hole ahead of the weld. Then you may slowly progress the weld, keeping the puddle molten and the torch constantly "mending" or "stitching" the sides of the joint to maintain an appropriate puddle and weave. Sometimes, depending upon the joint design, metal, filler and gap, no weaving will be required, unless you are operating at too low of an amperage.
5. Tips for welding out of position... Get comfortable, brace off, and wear your leathers. Use the force of the arc to hold the molten metal "plastered" in place, and maintain a short arc as possible, looking always for the keyhole and promptly adding filler before the keyhole gets too large. Adding the filler flat in the groove may be done to keep it from being a moving variable that is difficult to control... Weld up hill...For overhead, weld similar to flat, but paying attention to droops and quickly moving when one starts to form. Horizontal can be tricky as it requires more consentration and attention to keep the metal from "sagging" from gravity. Keep a tight arc, add the filler while the torch is pointed about 15 degrees upward.
I know this isn't exhaustive, and may not even be helpful, for I have tons more of material to discuss. But maybe you can see that welding is not going to be an overnight skill...But if you do have further questions, just ask...but be specific as possible so that the best answer can be given.
I forsee the next question being: But some other guys do it...They give great little charts, and calculators etc. Why do they do it then? This has arisen from the demand such as this...to have "something" that beginners can easily digest to broaden their market base.
But it has led to a lot of misinformation and frustration on the part of new welders...and you know that misinformation spreads faster than gossip about the organist's drinking problem at church. The misinformation comes from not understanding that these recomendations are made under ideal conditions with pro welders at the torch. The new guys take this at the gospel truth and tell their buddies how to do it...and swear by it because the chart on his welder said so. What isn't ever realized is that most likely the welding conditions hardly ever call for that exact setting. These guys never really get to venture off the page because they believe that there is only 1 setting that will make the weld and they never get their skills developed by having to compenesate with technique and talent to make a weld under poor conditions or with a poorly selected adjustment on the machine. For instance: A welder is trying to make a weld joining 1/8 inch metal to 1/4 inch metal...what amperage does he use, does he walk a 100 feet back to the machine to reset the machine for a 4 inch weld when he has been welding almost exclusively 1/4" plate and has the machine where he likes it? Or does he know how to compensate with his technique and skill to properly fuse both metals? A by the book solution would be to make the amperage change to the 1/8 amperage level. A practical solution would be to concentrate the heat onto the 1/4 plate and gently "wash" the weld into the 1/8 sheet.
I guess, I have said all of that to say this...I am glad to answer any and all questions... and likely one day we will give a one size fits all chart or calculator, but the problem is that it really does the new welder no long term favors. Sure there are minimum and maximum amperages for metal, electrodes, filler rods etc, but the combination is virtually endless unless you use a fixed logarythm that can't compensate for other variables. So please bare with us as we work on providing the information you seek.