Abstract
During manual self propagating welding, there are segregation phenomena of iron rich phase and copper rich phase. Cr element can restrain the segregation phenomenon of iron rich phase and copper rich phase. Cr is a strong ferrite element. When the amount of Cr2O3 + Al in the flux is less than 3wt%, with the increase of &2O3 + Al content, the microstructure of the weld alloy tends to be homogenized and the mechanical properties of the welded joint improve; when the amount of Cr2O3 + Al in the flux is more than 4wt%, Cr and C form Carbides are easy to produce microcracks in the fusion zone and reduce the mechanical properties of the joint. The best addition of Cr2O3 + Al in the flux is 3wt% ~ 4wt%.
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