George,
You're new to MIG but want near expert results? Don't we all?
Anyways, you are going to get some warping. But, the voltage and wirespeed are very closely tied together, so you have to play with the settings a bit to figure out the lowest heat setting that you can use to still get a good bond.
At low settings, the weld metal is going to transfer in globules, at quite high settings, spray transfer may begin to occur. Spray transfer creates a beautiful weld, but dumps lots of heat into it, too
Globular transfer does not sound nearly as nice, its kind of like water spitting in a hot skillet. However, this is most likely the mode you will be in, due to using lower wirespeed and voltage settings. Proper settings will result in a rapid-fire crackling sound.
Inert gas flux is required for a lower spatter and better looking weld, as well. There are three, or so, mixes of inert gas (that I am familiar with) used for steel welding. These all have an effect on the "heat" of the process. Talk to your gas supplier about the best choice for what you want, which is low heat, thin material welding.
The proper wire speed setting will keep the melt zone a 1/4 inch or so away from the copper tip of the MIG gun. This melt zone distance should increase as you increase the voltage, to prevent overheating the tip and the subsequent sticking of the wire inside of it.
For an .035 wire size, using what we call "MIG Mix Gold" inert gas, you can begin at 15volts about 160 inches per minute wire speed. If you use smaller wire, you can decrease these settings further.
First you get good, then you get fast. Then grouchiness sets in.
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)