How Much Gas Pressure for MIG Welder

The quality of the welding depends on maintaining the optimum gas flow rate. Shielding gas shields the melted weld puddle from atmospheric gasses which produce pinhole defects within the weld, known as porosity. 75 % argon and 25% carbon dioxide make up the usual shielding gas specifically for carbon steel. When talking about stainless steel and aluminum, various MIG welding shielding gasses are employed; nonetheless, the gas flow setting will stay constant for all shielding glasses.

Best gas for mig welding is a difficult technique to master, especially if you’re not aware of the functions of every valve, hoses, and knob. Not to talk about the fact that dealing with gasses can be hazardous, so you need to perform it right the first time. However, the most important factor again for weld is the gas pressure or we can call gas flow—two phrases that are sometimes misunderstood.

When best , the usual gas flow changes based on the inside nozzle diameter. The usual flow setting for 12-inch nozzles must be around 22-27 cubic feet per hour (CFH). You should utilize roughly 30-35 CFH for 58-inch nozzles, which are commonly used in industrial applications. 30-40 CFH should suffice for 34 inches.

To begin, the gas flow rate is measured in cubic feet per hour (CFH) and indicates the shielding gas’s flow rate during the welding process.

After you’ve determined the shielding gas to utilize, you’ll need to figure out the best flow rate to fulfill the welding job. This step is necessary to ensure that the hot molten metal pool has been appropriately shielded while performing the welding process and that seamless welding is achieved on the task. If the gas flow rate is insufficient, there is a high chance of a bad instance of air contamination to have occurred.  oxidation or porosity might occur as a result of the final weld.

Tips To Consider While Selecting An Appropriate gas flow rate

When choosing a gas flow rate, several elements must be considered, including the diameter of the size of the gas shroud, also the wire feeding speed, the travel speed as well as the quantity of the base metal’s mill scale.

Table -MIG Gas Flow Rate along with shroud size:


Shroud Diameter  (mm) 6 8 10 11 13 16
Shroud Diameter (inches) ¼” 5/16” ⅜” 7/16” ½” ⅝”
Flow rate (Cubic Feet/Hour (CFH)) 10-14 11-15 12-16 13-17 17-20 17-20
Flow rate (litres/minute) 5-7 5-7 5.5-7-5 6-8 8-9 8-9


Why Is My MIG Welder Popping

Among the first issues, people find while learning to weld, particularly MIG welding, is popping sounds. This popping has a negative effect, resulting in low-quality welding with such a high rate of failure.

If wire feeding occurs quicker than melting, a great chance of having MIG welder pops. Or when the solid wire has been used without using any type of shielding gas, this popping might also happen. The wrong size, kind, and wire speed, as well as voltage and amperage modifications, are all factors that contribute to this problem.

Reasons: Why Is My MIG Welder Popping?

Now let’s look at how to figure out what’s causing your MIG welder to pop. The following are some of the factors that will answer Why is my MIG welder popping?

  • Apply an incorrect Wire Speed
  • Using the incorrect wire size
  • Unaware of Material Thickness
  • Using an incorrect Wire Type
  • Using a tangled MIG Wire 
  • Incorrect Voltage or Amperage Setting
  • Shortage of Shielding Gas
  • Adopt a Wire Feed Mechanism that is misadjusted or worn-out

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