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What is the difference between shielded welding and un-shielded arc welding?

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Shielded Arc welding: Weld metal is protected from atmospheric gases, moisture etc by a shield of smoke and slag from electrode covering and shielding.

Un-shielded welding: Before 1923  bare rod welding was used to join metals. The welding was erratic and wandering and with a lot of porosity, and spatter etc. After 1923 Shielded welding rods were invented and now it is commonly used. For more information.

I have just found a website where you can find more info about welding.

I hope it will help you.

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