what is shielding gas

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  • Why is it called shielding gas?

  • And that鈥檚 why it鈥檚 called shielding gas. MIG shielding gas displaces air in the weld zone to create an environment that supports the desired weld characteristics. According to sciencing.com, the air we breathe contains mostly nitrogen (78%) and oxygen (21%) gases, with smaller amounts of argon, water vapor and other elements.

  • How does shielding gas work in welding?

  • As the shielding gas reaches the molten weld pool it acts as a shield protecting it from the other gases in the air. This 鈥榖ubble鈥?of gas moves with the welding gun and follows the weld bead, maintaining the integrity of the joint.

  • What is the best shielding gas for welding steel?

  • Carbon dioxide is a good shielding gas for welding steel. It works well in MIG welding providing good penetration and speed, but tends to cause more spatter in pure form. CO2 isn鈥檛 a good option for thin metals and performs best when combined with argon or another inert gas. Hydrogen often isn鈥檛 used as a shielding gas on its own.

  • Can hydrogen be used as a shielding gas?

  • Hydrogen often isn鈥檛 used as a shielding gas on its own. Instead, it鈥檚 usually combined with other gases, including argon and carbon dioxide. Used in small quantities, it aids in penetration and welding speed. Many industrial applications have turned to hydrogen for stainless steel welding due to the high cost of helium.

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