How to set up a MIG welder with gas – A Step-By-Step Guide

MIG welding, as you know, gas metal arc welding (GMAW), has functioned with the help of a MIG wire welder. It helps melt the metal for the weld bonding. It is quite a straightforward method of linking the metals together. It works by transferring warmth between the workpiece and electrode. In this process, the shielding gas is also provided to keep the metal piece safe from any contaminants. But for quality, you need to ensure the proper gas flow rate. Otherwise, the shielding gas could not protect the molten weld puddle from gases in the atmosphere. These gases, if not prevented, could cause porosity, pinhole imperfections, etc.

How to set up a MIG welder with gas

There are different shielding gases for different kinds of materials. For carbon steel, the shielding gas comes with a composition of 75% argon and 25% carbon dioxide. Special MIG welding shielding gases are available for welding aluminum and stainless steel. It doesn’t matter which shielding gas you will use, but the gas flow must remain the same throughout the welding. Let’s have a look at the procedure of how to set up a MIG welder with gas.

How to set up a MIG welder with gas?

For setting a MIG welder with gas, there are simple steps that you need to follow properly and get the required results. Let’s have a look at these simple steps.

  • First of all, set the bottle of shielding gas on the holder of the MIG welder. It would help if you also hooked the chain around the bottle to keep it intact around the welder.
  • You need to inspect the hoses attached to the gas regular if there is any damage to it. If there is any damage, then immediately exchange it with a new one which is damaged free.
  • Now you need to clear any dust and debris from the bottle valve. For this purpose, quickly open and close the valve handle available at the top of the shielding gas bottle.
  • Now, it’s time to insert the nipple of a gas regulator. Please insert it into a threaded valve area of the shielding gas bottle—Hand-tight the nut by turning it clockwise. It would help if you used an adjustable wrench to keep it tight.
  • After the tightening of the locking nut with an adjustable wrench, turn on the gas valve that you have cracked above.
  • Check if there is any gas leakage surrounding the hoses, connections, and gas regulator. Shielding gas is an inert gas, but there will be gas loss in case of leakage, or if you are working in a confined area, it could also result in asphyxiation.
  • Now, it’s time to turn on the MIG welder.
  • To activate the gas valve, trigger on the MIG gun. Keep checking the PSI reading on the regular gauge. It must be anywhere between 25 to 30 cubic feet per hour.
  • If the reading is not the required reading, you depress the MIG gun trigger until you get the reading between 25 to 30 cubic feet per hour. The handle below the left regulator could also be turned on for this purpose.
  • While adjusting the gas pressure, you must trim all the excessive wire coming out from the MIG gun tip.
  • Adjust the gas pressure as the conditions demand. In case of wind or breeze from a fan, higher gas pressure is required. But if the gas pressure is too high, it would result in turbulence around the welding puddle. It could also result in porosity and disturb the overall quality and strength of welding.

Frequently Asked Questions

What is the correct gas pressure for MIG welding?

MIG shielding gas flow is usually measured in cubic feet per hour, not in PSI. The gas flow is generally set at a very low flow rate, unlike oxy-fuel cutting and welding. While welding, the gas pressure that goes into the hose is usually set at 3 to 8 PSI.

Does a MIG welder need gas?

It depends on what kind of welder you are going to use. There are without gas MIG welder which comes with wire filled with flux. Flux is loaded for the protection of molten weld puddles. Shielding gas in the gas MIG welder is also used for the same purpose as the Flux core wire in the NO gas MIG welder.

Is stick welding stronger than MIG?

Yes, the stick welding is a little bit stronger than MIG welding. It can carry out huge or big projects. The substantial welding task is usually performed with the help of stick welding. It can also penetrate more than MIG welding.


The MIG welder set up with gas is a crucial thing in the field of welding. But you need to set it properly before applying the welding on a different kind of material. Here we have explained all the crucial steps you need to take for the welding purpose. Just follow these steps and set the shielding gas with the MIG welder.

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