Sleeve welding repair method in blast-furnace tuyere
A technology of welding repair and tuyere sleeve, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of high labor conditions and strength, difficult to control the proportioning amount, uneven gas mixing, etc., to ensure the welding seam Quality, easy handling, fast welding results
Active Publication Date: 2014-05-21
ANHUI MASTEEL ENG & TECH GRP
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Problems solved by technology
The preheat welding method has low welding efficiency in manual operation, high labor conditions and high strength, and requires large heating equipment and heating furnaces when welding large pieces of equipment, so the welding cost is relatively high
The non-preheating welding method currently uses argon + helium mixed gas shielded welding. This welding method improves the working conditions and welding efficiency during manual operation, but it has higher requirements for operating technology. For The ratio of argon and helium requires professional equipment and the ratio is not easy to master. If the ratio equipment is not used properly, it will easily cause uneven gas mixing, which will make welding difficult.
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[0020] Referring to the accompanying drawings, a method for repairing the sleeve welding of blast furnace tuyere, its technical scheme is as follows:
[0021] Step 1: Clean the repaired area, first use a wire brush to remove oxides and other impurities in the repaired area of the middle sleeve to be welded, and then use acetone or alcohol to clean;
[0022] Step 2: Determine the location of the crack, and use the coloring method for cracks that are not visible to the eye to show the specific location and direction of the crack;
[0023] Step 3: Open a narrow gap groove, use an angle grinder to grind down along the center of the crack until the crack is ground clean, and grind a U-shaped groove suitable for welding, the groove angle β is 10 °-15°, the radius R of the groove bottom is 2.5-3.5mm;
[0024] The fourth step: selection of welding materials and equipment, the specification of welding wire 2 is HS201, the diameter is ф4.0mm, and the welding wire is polished ...
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Abstract
The invention discloses a sleeve welding repair method in a blast-furnace tuyere. According to the technical scheme, the sleeve welding repair method comprises the steps of (1) cleaning a repair area, (2) determining the position of a crack, (3) opening a narrow gap groove, (4) selecting welding materials and devices, (5) adjusting a welding current, the gas flow and a polishing tungsten electrode in advance, (6) conducting welding, (7) conducting heat preservation and cleaning after welding, coating a weld joint obtained after welding with asbestos, conducting slow cooling until the room temperature is reached, after the weld joint is slowly cooled and the temperature of the weld joint reaches the room temperature, using a polishing machine for cleaning the weld joint and clean away splashes near the weld joint, and meanwhile enabling polishing weld reinforcement of the weld joint to range from 2 mm to 3 mm. According to the sleeve welding repair method in the blast-furnace tuyere, under the situation that preheating is not carried out, the welding speed is high, the quality of the weld joint is ensured, the welding operation is easy and convenient, and the weld joint basically meets the level of a new spare part through welding repair.
Description
technical field [0001] The invention belongs to a welding repair process for auxiliary equipment of a large-scale blast furnace, in particular to a welding repair method for a tuyere of a blast furnace. Background technique [0002] At present, the welding of copper and steel in the tuyere of a large blast furnace mostly adopts two kinds of preheating welding method and non-preheating welding method. The preheat welding method has low welding efficiency in manual operation, high labor conditions and high strength, and requires large heating equipment and heating furnaces when welding large pieces of equipment, so the welding cost is relatively high. The non-preheating welding method currently uses argon + helium mixed gas shielded welding. This welding method improves the working conditions and welding efficiency during manual operation, but it has higher requirements for operating technology. For The ratio of argon and helium requires professional equipment and the...
Claims
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IPC IPC(8): B23K9/167B23K9/235B23K9/04
CPCB23K9/167B23P6/04
Inventor 马骝张烨
Owner ANHUI MASTEEL ENG & TECH GRP
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