Reclaiming of Submerged Arc Welding Slag: Comparison Between SAW Processes with and without Slag-Mix

Submerged arc welding (SAW) is widely used in the fields such as ship buildings and steel pipe production. Recently reuse of SAW slag as a raw material of SAW flux has been discussed, as a measure to reduce costs and to conserve natural resources. The present study investigated distribution of P in the slag and its major origin (i.e., welding wire or base metal plate). It also proposed slag remelting as a method of P concentration reduction of the slag. It was recognized that P was mainly distributed in the matrix and metallic steel particles with only larger diameters. It was also identified that the base metal plate was the main source of P in the slag. Remelting of the slag was proved as a promising method for P concentration reduction of the slag.

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Distribution and reduction in P concentration of submerged arc welding slag

Kojima

Suzuki

Tanaka

2018

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY

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Comparison of chemical compositions and micro-structure between flux and slag on submerged arc welding

Kojima

Mizukami

Suzuki

et al. 2018

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY

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Submerged arc welding (SAW) is widely used in heavy industry fields, such as ship buildings or steel pipe mills. Some papers pointed out that recycle use SAW slag to SAW flux is effective to conserve natural resources and also to save flux cost. In this paper, we have compared chemical compositions, crystal structure, and melting behavior between flux and slag in SAW process. Most of chemical compositions of slag were the same as those of flux except Fe and P. Fine metallic steel particles were recognized in slag and the size of them were very similar to welding fume. Major differences were not detected in crystal structure and melting behavior in comparison between flux and slag.

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Formation mechanism of fine steel particles in submerged arc welding slag

Kojima

Mizukami

Suzuki

et al. 2018

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY

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Submerged arc welding (SAW) is widely used in heavy industry fields, such as ship buildings or steel pipe mills. Some papers pointed out that recycle use SAW slag to SAW flux is effective to conserve natural resources and also to save flux cost. In this paper, we have investigated reasons why M. Fe content of slag changed when different chemical composition flux was conducted in SAW. We have also investigated which one either welding wires or base metal plates are main source of M. steel particles in SAW slag. We have concluded that change of M. Fe content in slag resulted from difference of arc temperature in SAW, and welding wires were main source of fine M. steel particles in SAW slag.

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Reclaiming of Submerged Arc Welding Slag: Comparison Between SAW Processes with and without Slag-Mix

Cited by 3 publications

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Distribution and reduction in P concentration of submerged arc welding slag

Distribution and reduction in P concentration of submerged arc welding slag

Comparison of chemical compositions and micro-structure between flux and slag on submerged arc welding

Formation mechanism of fine steel particles in submerged arc welding slag

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