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采用不锈钢带极双层堆焊,在低合金高强钢表面堆焊不锈钢耐蚀层。研究了过渡层、表面层带极成分对堆焊层的成分、组织及堆焊层δ铁素体含量的影响,并对堆焊试样进行横向侧弯和纵向侧弯测试。结果表明:过渡层采用309L、表面层采用347L宽50 mm带极,在焊接电流700~850 A、焊接速度140~160 mm/min条件下,可获得与低合金高强钢基体结合良好的堆焊层,堆焊层的增碳层无明显M脆化倾向,堆焊层组织为均匀的奥氏体+δ铁素体双相组织,δ铁素体含量在4.5%~5.5%之间,奥氏体晶粒明显细化。
The use of stainless steel with a very double layer surfacing, low alloy high strength steel surfacing stainless steel corrosion layer. The effects of the transition layer and the surface layer with the polar components on the composition, microstructure and the δ ferrite content of the overlay were studied. The lateral bending test and longitudinal bending test of the welded samples were carried out. The results show that the transition layer is 309L, the surface layer is 347L wide and 50mm with a pole, and the welding with the current of 700 ~ 850 A and the welding speed of 140 ~ 160 mm / min can obtain a good surfacing welding with low alloy high strength steel substrate There is no obvious M embrittlement in the carbon layer of the surfacing layer. The surfacing layer is homogeneous austenite + δ ferrite duplex structure with δ ferrite content of 4.5% -5.5% Significant refinement of the grain of the body.