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Effect of Various Alloy Elements on Welding in Weld Core
Mar 21, 2018

Carbon (C) Carbon is the main alloying element in steel. When the carbon content increases, the strength and hardness of the steel increase significantly, while the plasticity decreases. In the welding process, carbon plays a deoxidizing role, and it cooperates with oxygen to generate carbon monoxide and carbon dioxide gas at the high temperature of the arc, eliminating air in the arc zone and the molten pool, and preventing harmful gases such as oxygen and nitrogen in the air. The adverse effect on the molten pool reduces the oxygen and nitrogen content of the weld metal. If the carbon content is too high, the reduction effect is severe and large splashes and pores are caused. Considering the effect of carbon on the hardenability of the steel and its increased sensitivity to cracks, the carbon content of the low carbon steel core is generally 0.1%.

Sulfur (S) sulfur is a harmful impurity, with the increase in sulfur content, will increase the thermal cracking tendency of the weld, so the content of sulfur in the welding core must not be greater than 0.04%. In the welding of important structures, the sulfur content must not be greater than 0.03%

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