Laser cladding repair method for breast roll
A technology of laser cladding and repairing method, which is applied in the direction of coating, metal material coating process, etc., can solve problems that cannot be used to repair rack rolls, difficult solutions, etc., to reduce impact, reduce accidents, and ensure rolling The effect of line elevation
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Embodiment 1
[0030] Example 1: The first repair of the finishing stand rolls of Minmetals Ying Steel Heavy Plate Plant, the process flow:
[0031] (1) Carry out turning processing on the rack roller with the shape of wear to remove the fatigue layer;
[0032] (2) Carry out coloring flaw detection on the frame roller, there is no crack on the surface, and carry out ultrasonic flaw detection according to JB / 75000.15-2007 standard, with a sensitivity of Ø3, qualified;
[0033] (3) Flame heating and preheating above 150°C, use 08A welding wire to surfacing to an outer diameter of 602mm, and the hardness after welding is HB260-270;
[0034] (4) Slow cooling and annealing at 570°C for 8 hours to remove welding stress;
[0035] (5) Turning on a lathe to a diameter of 598mm;
[0036] (6) Carry out coloring flaw detection and ultrasonic flaw detection, and the flaw detection is qualified;
[0037] (7) Configure laser cladding powder. The cladding layer should have the characteristics of impact r...
Embodiment 2
[0051] Example 2: Secondary repair of the roughing stand rolls of Minmetals Ying Steel Heavy Plate Plant, the process flow:
[0052] (1) Turning on a lathe to a diameter of 597.8mm;
[0053] (2) Carry out colored flaw detection and ultrasonic flaw detection, and the flaw detection is qualified;
[0054] (3) Configure laser cladding powder. The cladding layer should have the characteristics of impact resistance, wear resistance, corrosion resistance, and high temperature resistance. The chemical composition weight percentage: silicon 1.3%, chromium 29%, nickel 19%, manganese 0.32%, Vanadium 1.9%, molybdenum 5.2%, tungsten 6.2%, yttrium 0.12%, the rest is iron and unavoidable impurities, the powder particle size is 53-150μm;
[0055] (4) Formulate a reasonable laser cladding process, the process parameters are:
[0056] Focus lens f= 400mm,
[0057] Cladding power P=4000W,
[0058] Spot diameter D=3.2mm,
[0059] Cladding line speed V=800mm / min,
[0060] 50% overlap rate, ...
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