Converting sheet metal gauge numbers to millimeters is as simple as following the chart below. For a more comprehensive gauge chart you can check out our sheet metal gauge chart here. This chart covers the common and uncommon sheet metal sizes for steel, aluminum and galvanized steel. Typically the even number gauges are used more frequently. Metal Thickness & Amperage Settings: When welding mild steel, a good rule of thumb is to set the amperage level at 1 amp for every 0.001” of thickness. So if you are welding 12 gauge mild steel with a thickness of 0.100”, you would set the machine at 100 amps.

Table 1 Fire Resistance Ratings ... 24-gauge steel deck with clear spans £ 78-inch. 9. An Unrestrained Assembly Rating of 1 hr. is achieved for 1 5/16-inch, 24-gauge ...