You are asking a very open ended question. When you talk about spatter it is caused by any number of things, without having a few more details it would be hard to nail down specifically what you could do to reduce or eliminate it. GMAW welding has three basic modes of metal transfer,these are short-arc transfer, globular transfer, and spray transfer, you could possibly consider pulse arc as a type of transfer too. The most commonly used of these three are short-arc and spray transfer, pulse arc welding definitely has some very valuable applications in many cases, globular transfer is very erratic and doesn't necessarily provide an astetically pleasing result. Shielding gases can have a significant impact on how the weld puddle reacts, arc voltage and other electrical parameters can also have a lot to do with the characteristics of the weld. If the ground portion in the welding circuit is questionable or in some cases positioned wrong you can experience arc blow, welding towards the ground will sometimes cause more problems with arc blow,whenever possible weld away from the ground. If you don't know what arc blow is or if you don't know of it by that name it generally is a condition where the arc is acted upon by the magnetic fields that are produced by using DC current, AC current generally doesn't produce arc blow. This condition is noticeable by the arc not wanting to go where you point the wire, it will favor one side or the other of the joint and in some cases will cause great amounts of spatter to go in all directions. Wire diameter can also contribute to negative conditions when you are trying to make certain welds. Matching the wire diameter to the materials that you are welding will sometimes give you much better results. Example: you would not want to try to do body work on your car or pickup using an .052 diameter wire with 98/02 shielding gas. I believe that if you are able to provide some more information concerning your question there are a lot of folks out there who will be able to give you some suggestions that will help you to reduce your spatter problem. Good luck and regards, aevald