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MIG Welding Fabrication

weldingMIG welding fabrication stands for Metal Inert Gas Welding, also known as Gas Metal Arc (GMA) or Gas Metal Arc Welding (GMAW).  Generally the name differs based on the type of gas being used, Inert Gas or Non-Inert Gas. MIG welding fabrication was developed in the 1940s and is now used in high production shops. MIG welding does not require as much skill as other welding processes since it is semi-automated.  This type of welding creates clean weldments with very little smoke. It is fast and has a low skill level to operate. It’s also great for spot and tack welding.  MIG welding fabricators use a trigger to dispense the wire that is fed from a spool to the weld joint.  Some say the wire is very similar to a bicycle break cable since the wire goes through a liner, which contains a gas that is also fed through the cable to the point of the arc.    

MIG welding fabrication uses electricity to produce heat, an electrode to fill the weld joint, and shielding gas which protects the weld from the surrounding air.  The small electrode or wire is fed continuously and semi-automatically, while the welder controls the welding. There are four ways of transferring the wire to the weld joint, which include: Short Circuit, Globular, Spray, and Pulsed Spray.

  • Short Circuit Transfer is used at a lower voltage and occurs when the wire arcs and comes in contact with the metal in short circuits.  When the wire meets the heated metal, it puddles.  With several short circuits, it sounds like several fast crackles.

  • Globular Transfer is very similar to the short circuit transfer as it occurs when the wire arcs when it contact with the metal, but the wire melts longer and creates a blob instead of a puddle.  The sound of globular transfer has a popping sound every few seconds.

  • Spray Transfer requires high voltage, and the transfer is a spray.  The wire sprays or mists to the metal when it arcs.  The sound is of spray transfer is a hiss.

  • Pulsed Spray Transfer is utilized with special equipment which pulsates the voltage several times a second.  This effect allows an arc between spray transfer, to globular transfer, and then back to spray transfer repeatedly.

When welding with carbon steel, a MIG welder is perfect. However, when welding with stainless steel, there are some issues and even require a large percentage of Argon.  When the wire is fed to the joint, it creates too much friction since the stainless steel is stiffer than say carbon steel.  If MIG welding is used for stainless steel, many times it is done using a spray transfer or globular spray.

Welding aluminum is not very common for MIG welding and even requires pure Argon using a spray transfer.  When welding aluminum, a double feed is required using a push and pull method when the wire is pushed through the handle and pulled by the handle itself.

Below are the types of MIG welding equipment we have in our state-of-the-art 153,000 square foot facility.

Machine Brand and Type
Highlights

Powcon 225SMC MIG Welder

Quantity: 1
Amp: 275
Cutting Capacity: ½ inch plasma

Lincoln Waire-Matic 255 MIG Welder

Quantity: 1
Amp: 250

Millermatic 185 MIG Welder

Quantity: 1
Amp: 150

Lincoln Power MIG Welder

Quantity: 1
Amp: 230

Millermatic 200 MIG Welder

Quantity: 1
Amp: 200

Millermatic 350P MIG Welder

Quantity: 2
Amp: 300

Millermatic 130XP MIG Welder

Quantity: 1
Amp: 90

Millermatic 252 MIG Welder

Quantity: 2
Amp: 200

Click here for our complete equipment list...


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