Weld notes pdf

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Defects/imperfections in welds - porosity

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The characteristic features and principal causes of porosity imperfections are described. Best practice guidelines are given so welders can minimise porosity risk during fabrication.

Identification

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Porosity is the presence of cavities in the weld metal caused by the freezing in of gas released from the weld pool as it solidifies. The porosity can take several forms: 

• Distributed 

• Surface breaking pores 

• Wormhole 

• Crater pipes

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