CERTIFIED WELDING

WHAT IS THE DIFFERENCE BETWEEN MIG AND TIG?

MIG (Metal Inert Gas) Welding

MIG Welding uses an inert gas to shield the weld metal from being affected by undesired elements, such as oxygen.  MIG welding uses an arc of electricity to complete a circuit between a continuously fed anode (+ the wire-fed welding gun) and a cathode ( – the metal being welded).  Metals commonly joined using MIG welding include carbon steel, stainless steel, aluminum, magnesium, copper, nickel, silicon bronze, and other alloys.  MIG welding is typically suited for thin to medium-thickness metals.

TIG (Tungsten Inert Gas) Welding

TIG welding is similar to MIG welding with the main difference being that TIG uses a tungsten current form.  Tungsten is used because it can be heated to a higher temperature than most other metals.  A separate filler rod is used to fill the weld area, and because the arc does not pass directly through this material, a wider variety of materials can be used.  No other welding process allows welding with as many alloys in so many configurations.  While this process is far more difficult than MIG welding, the welds can be truly beautiful – not just the means for joining two pieces of metal.  TIG is most commonly used to join thin materials, especially nonferrous metals (aluminum, magnesium, copper) and small-diameter, thin-wall tubing – think bicycles!  The process is commonly used to repair tools and dies, especially components made of aluminum and magnesium.

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