Surface of the roller Crusher welding method – roller crusher – Machinery Indust
Qian'an Hip Hing cement used arc welding, welding double roller crusher roller surface, made up to 10 months of life, the effect of crushing 150,000 tons of clinker. Welding points are:
(1) the choice of electrode: To use D-65, D-667, and 506 electrodes, welding before, by welding instructions, the welding rod drying, placed in reserve incubator.
(2) roller surface treatment: the roll surface can be divided into local direct repair welding repair and overall repair welding after total removal of two methods can also be said that the two processes. Along the roll width direction of uneven wear and tread, uneven wear and hard spots overall roll surface wear, can be taken directly to the local repair welding repair methods; 5-6 times after direct repair welding, because of the mother's body to withstand repeated high extrusion compressive stress, welding cracks expanding, and roller surface will have a certain thickness of the fatigue level, then wear at this time if direct repair welding repair welding rod, easy to produce layers off, so be on the roller surface layer of a thorough clean-up of fatigue to wear layer after surfacing. Hip Hing cement plant on the roll surface after the repair welding repair to the overall clearance. Either directly or as a whole cleared repair welding repair welding, grinding rollers roll roundness error and two errors are not too large in diameter, otherwise it will cause the level of vibration and the two roller press roller uneven load increased. Cleaning roller surface fatigue level that can be used to clean up carbon arc gouging, to the roll surface layer plane fatigue net, so that the base metal layer exposed rollers. Surfacing ago, according to electrodes for use, the drying of the electrode, welded pieces of warm, slow cooling after welding.
(3) to use power more than 10 kVA or 20 kVA DC over AC Welder. DC welding machine to reverse (electrode connected positive). Surfacing when AC welding required load voltage 70V, the current should know about in 200A. If no-load voltage less than 70V, we must increase the current to the base metal electrode and subject to full fusion. Bead width and height ratio to 3:1 is appropriate. Only in this way a genuine and solid base metal fusion bonded to form the necessary wear resistance organization.
(4) welding sequence and thickness: Preheat roller surface, the first with a 506 electrode surfacing 1-3, will look for a round roll. Then evenly layer of surfacing a few D-667, to achieve the desired thickness. D-667 After surfacing welding layer, and then surfacing layer of D-65, surfacing thickness 3-5mm; D-65 after the surfacing welding layer, and then D-65 Ling-shaped pattern surfacing layer. (Roll surface wear and tear production, materials need to be both a crushing pressure and relative sliding of two factors. Pressure determined by the material nature, is often difficult to change. The patterns form by the roll surface to reduce the material in the extrusion process and the roll The relative sliding surface, more easier. domestic chevron pattern of early use of materials, although the circle can stop sliding, but not restricted to the material in the extrusion process in the axial sliding, especially in the smaller particles of materials for extrusion , wear even more serious. In contrast, Ling-shaped pattern with the middle of the hard particles and the roll surface, wear the best.) Ling-shaped pattern of the side length of 4-5cm, 1cm bead width of about height of about 4mm. The wear-resistant layer of uniform thickness should strive to make the process of extrusion roll forever remain in the use of circular.
(5) when surfacing to three shifts, do not break Xiema so welded to maintain a high temperature for long periods.
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