Welding repairing method for rolls
A technology of welding repair and roll, applied in the field of roll welding repair, can solve the problems of roll breakage, high price, uneven hardness of the roll, etc., and achieve the effect of reducing expenses
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[0011] In the roll welding and repairing method of the present invention, the roll contains the following components in weight percentage: C 1.50-2.20%, Si≤0.060%, Mn 0.40-1.20%, P≤0.030%, S≤0.025%, Cr 3.00-8.00%, Ni 0.00-1.50%, Mo 2.00-8.00%, V 2.00-9.00%, W 0.00-3.00%, Nb 0.00-0.85%, Al 0.00-1.20%, and the rest is Fe; the repair steps are as follows: 1) Repair cracks 1. Conduct crack depth and length flaw detection on the damaged part, and grind and clean the cracked and damaged parts on the surface of the roll; 2) Heat and preheat the roll; 3) Use surfacing welding process for repair welding; 4) Post-weld heat treatment; 5) Carry out mechanical processing according to the drawing requirements; 6) Carry out non-destructive testing and hardness testing.
[0012] The above step 1) needs to wipe the surface of the roll clean to remove oil and impurities. When the surface layer of the roll is damaged, use an electric grinding wheel to smooth the shedding area until it reaches th...
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