When using a wire feed welder, you first need to make sure there is not an excessive amount of wire sticking out.
Keep the welder running for about a minute before you begin using it.
While welding, look out for blue discolorations.
This is a sign that you have good penetration on both sides of the weld.
You also have to make sure you are using the appropriate wire speed, which may take some trial and error.
Finally, you must hold the welder in an almost horizontal position so you can have better control of the weld puddle and optimize performance.