Oxygen Oxidation Loss in Weld Pool
In the molten weld metal, oxygen reacts with metals like nickel and cobalt, burning off valuable additions and forming unwanted oxides. This can impair strength and corrosion resistance.
Physical-Chemical Mechanism of Action
In the molten weld metal, dissolved oxygen reacts with metals like nickel and cobalt. These reactions can burn off valuable alloying elements and form unwanted oxides such as nickel oxide or cobalt oxide.
Metallurgical Relevance & Risks in Welding
The oxygen loss through oxidation reduces valuable alloying elements, which compromises the strength and corrosion resistance of the weld. Additionally, unwanted oxides can cause inclusions that degrade the microstructure and promote cracking or spalling.
Workshop Practice & Instructions
To minimize oxygen loss through oxidation, use clean base metal and keep the weld pool well covered. Use deoxidizers like silicon or potassium hydroxide in the molten weld metal to bind oxygen. Also, control temperature carefully during welding to avoid unwanted reactions.