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这次堆焊的是富拉尔基重型机械厂生产的80CrMnMo锻钢轧辊。首先轧辊经过探伤、车削和复检,一般车削深度15～20mm。堆焊前轧辊必须预热,以防止轧辊在堆焊时产生温度应力和体积应力。堆焊焊接电流450～600A,焊接速度25～30m/h,焊道厚度2～3.5mm,焊层温度260～280℃。堆焊过程中,轧辊要继续保温,保证轧辊不低300℃。堆焊后轧辊要进行回火处理,以消除焊接残余应力,防止堆焊层或母材产生裂纹。回火温度应为550±10℃,保温8h。堆焊后轧辊平均硬度HRC为35～44。堆焊4支轧辊共节约39.87万元.
This surfacing is the production of 80 CrMnMo forged steel roller Fularji Heavy Machinery Factory. First roller after flaw detection, turning and re-inspection, the general turning depth of 15 ~ 20mm. Pre-welding roll must be preheated to prevent roll in the surfacing temperature stress and volume stress. Surfacing welding current 450 ~ 600A, welding speed 25 ~ 30m / h, weld thickness 2 ~ 3.5mm, the welding temperature 260 ~ 280 ℃. Surfacing process, the roll should continue to heat, to ensure that the roll is not low 300 ℃. After surfacing roll to tempering treatment to eliminate welding residual stress, to prevent surfacing layer or base material cracks. Tempering temperature should be 550 ± 10 ℃, insulation 8h. Surfacing after the average hardness of the roll HRC 35 ~ 44. Surfacing welding 4 rolls a total savings of 398700 yuan.