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Study on blowhole sensitivity of self-shielded flux cored used for pipeline steel
Pages: 61-65+20
Year: Issue:  6
Journal: Welding Technology

Keyword:  self-shielded flux cored wirethe residual Al contenttrace elementblowhole sensitivity;
Abstract: How to enhance the low temperature toughness of the deposited metal is the critical index. In order to improve the low temperature toughness of self-shielded flux cored wire, In the paper, Ba F2-Fe2O3-Al-Mg slag system was selected as basis slag system. By controlling the residual Al amount, carrying out the test of low temperature impact toughness of the deposited metal, then giving the analysis to structure and its inclusion, conclude that higher the residual Al content in deposited metal had a worse impact on the toughness. Toughness impact depended on the shape and sizes of inclusion, the residual Al content, trace elements content, O and N content, optimum ratio of aluminum to oxygen in weld metal. The additions of trace element will help to maintain the relatively higher toughness. Therefore, the present work has a certain theoretical significance and practical value.
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