What is the difference between MIG and TIG welding?

There are different mediums that welders use depending on their specific project needs.  Two of the welding types are MIG and TIG.  While both techniques use an electric arc to make the weld, the process for each is vastly different.

Determining a Method

MIG (metal inert gas) welding is the easier of the two methods and uses a continuous wire feed as an electrode and an inert or semi-inert gas mixture to protect the weld from contamination. Wire is continuously fed through, then burns, melts and fuses the two pieces of metal together.  Since the electrode is continuous, welding speeds are greater. As a faster and cheaper process of welding, it is used for anything from hobbies to shipbuilding.  Using this method, you can weld together mild steel, stainless steel, aluminum, etc.  MIG welding can be used to weld materials from thin sheet metal to heavy structural plates.

TIG (tungsten inert gas) welding is a manual welding process that uses a nonconsumable electrode made of tungsten, an inert or semi-inert gas mixture, and a separate filler material. TIG welding is more specifically used for thinner gauge materials, as it allows you to not burn through the metal. It requires significant operator skill and can only be accomplished at relatively low speeds. As a more mild welding technique, TIG welding is commonly used when the weld integrity is critical as it provides a more precise weld. Offering better heat control, this style of welding also produces stronger welds. Since the weld yields an aesthetic surface finish, it also does not require any grinding. TIG welding is a cleaner style of welding that produces less fumes and sparks than MIG welding. Typical applications range from stainless steel fabrications to delicate materials such as jewelry.

MIG Welding	TIG Welding
▪       Easiest of the welding methods	▪       Produces the best looking weld
▪       Not preferred for thin gauge steel (burn through)	▪       Can fuse metal together without filler material
▪       Cheaper than TIG Welding	▪       More expensive than MIG welding

Sheet Metal Unlimited is capable of using either procedure to provide the product you need when you need it.  To discuss your plans specifically and get a quote for your next job, contact us today!