THE ATOM STRUCTURE, GASES, AND BONDS

THE ATOM STRUCTURE

• Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).

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MIG VS MAG

• As the name suggest, Metal Inert Gas (MIG) welding process utilizes suitable inert gas for shielding purpose during welding. Such gas is mainly argon or helium, or a mixture of these two in different proportions. Since these gases are chemically inert thus they remain stable even at extreme arc heat. Therefore they do not contribute in altering any weld characteristics apart from protecting the weld bead and electric arc from any external influence.

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• On the other hand, Metal Active Gas (MAG) welding utilizes an active gas mixture as shielding gas. For example, a suitable mixture of carbon di-oxide (CO2) and oxygen (O2) along with other comparatively stable gases like argon, helium, nitrogen, etc. Besides fulfilling basic requirement of shielding gas, such active gases can break down due to arc heating and subsequently induce various chemical elements on weld bead that can enhance joint properties. It also contributes in stabilizing arc, reducing spatter level, etc. Various differences between MIG welding and MAG welding are given below in table format.

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IONIC BOND