A method for repairing a broken ladle continuous casting arm

Abstract

This invention relates to a method for repairing fractures in a ladle casting boom. The method involves retaining the longitudinal intermediate stiffening plate and two transverse stiffening plates inside the boom, while removing the rest. The plug weld holes on the panel, located away from the bevel, are preserved. The bottom support plate is extended so that the weld between the bottom support plate and the diagonal support plate does not overlap with the stiffening plates installed in the plug weld holes, thus increasing strength. A reinforcing plate is added to the outside of the panel to further enhance structural strength. Welding is performed using a preheating torch at 80℃-100℃, followed by gas shielded welding with ER50-6 welding wire. Narrow-bead multi-layer welding is employed, with stress relief achieved through hammering during welding, and carbon arc gouging to clean the weld roots. The advantages are: by changing the original bevel design and the boom structure, eliminating the plug weld holes at the point of maximum stress, the strength of the boom is increased, and the frequency of major equipment overhauls is reduced.

Description

Technical Field

[0001] The invention relates to a method for repairing a broken ladle continuous casting rotating arm. Background Art

[0002] See Figure 1 , Figure 2 The ladle continuous casting arm is a component that supports the ladle. Once cracks or even breaks occur, production needs to be stopped for repair to avoid safety accidents. After observation, the location where the cracks in the continuous casting arm appear is mainly at the groove. Figure 4 The weld at B1 was not welded properly due to the small groove, and the weld strength was not high due to poor welding quality. In addition, cracks also appeared in the plug welding hole of the panel near the groove. Figure 3 The main reason is that the panel has a plug welding hole in the same direction as the crack at the point where the maximum force is applied, which reduces the strength of the steel plate and causes poor welding quality at the plug welding hole. In order to reduce the number of repairs of the continuous casting arm, the strength of the continuous casting arm needs to be increased. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a method for repairing a broken ladle continuous casting arm, thereby increasing the arm strength, reducing the number of equipment overhauls, and resuming production in advance.

[0004] To achieve the above object, the present invention is implemented through the following technical solutions:

[0005] A method for repairing a broken ladle continuous casting arm comprises the following steps:

[0006] 1) The longitudinal middle rib plate and two transverse rib plates are retained inside the ladle continuous casting arm, and the rest are removed. The plug welding holes on the panel away from the groove are retained, and the bottom support plate is extended so that the weld between the bottom support plate and the inclined support plate does not overlap with the rib plate installed on the plug welding hole to improve the strength; and a reinforcing plate is added on the outside of the panel to improve the structural strength;

[0007] 2) The welding sequence is:

[0008] The first welded parts: the middle rib plate, the rib plate installed on the plug welding hole, the diagonal support plate, the bottom support plate, the upper support plate, and the vertical wall plate; the second welded parts: the vertical rib plate; the third welded parts: the rib plate set at the bottom of the vertical rib plate; the fourth welded parts: the bottom plate and the panel; the fifth welded parts: the reinforcement plate;

[0009] 3) Welding: Preheat to 80℃-100℃ before welding, use a baking gun for preheating, gas shielded welding, and use ER50-6 welding wire. Welding wire; narrow-pass multi-layer welding, hammering to relieve stress during welding, carbon arc gouging to clean the weld root; grinding both sides of the weld after welding to remove spatter, rust and slag;

[0010] 4) NDT: After welding, the weld is subjected to ultrasonic testing. The testing standard is GB / T11345-89 Level II NDT, and the surface weld quality meets the requirements of JB / T5000.3 standard.

[0011] In step 3), the upper support plate and the vertical wall plate are welded in a K-type groove.

[0012] The ladle continuous casting rotating arm includes a symmetrically arranged panel and an intermediate rib plate parallel to the panel. The panel and the bottom of the intermediate rib plate are welded and fixed by a bottom plate. A rib plate is welded between the panel and the intermediate rib plate. The panel, upper support plate, vertical wall plate, oblique support plate and bottom support plate are welded to form a cavity structure with an intermediate bend. Vertical rib plates are fixed on both sides of the intermediate rib plate. The upper and lower ends of the vertical rib plate are welded to the rib plate. The sides of the vertical rib plate are welded to the upper support plate, vertical wall plate, oblique support plate and bottom support plate. A reinforcing plate is welded to the outside of the panel, and the welds of the rib plate fixed to the upper end of the vertical rib plate do not overlap with those of the oblique support plate and the bottom support plate.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The method of repairing the broken ladle continuous casting arm is to change the groove form of the original design, the structural form of the ladle continuous casting arm, cancel the plug welding hole at the maximum stress point, increase the strength of the ladle continuous casting arm, reduce the number of equipment overhauls, greatly reduce the repair cost and manpower and material resources, and resume production ahead of schedule. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the original continuous casting arm.

[0016] Figure 2 yes Figure 1 Cross-sectional view along line aa.

[0017] Figure 3 It is a schematic diagram of the plug welding hole.

[0018] Figure 4 It is a schematic diagram of the crack location.

[0019] Figure 5 It is a schematic diagram of the structure of the ladle continuous casting arm after the fracture is repaired.

[0020] Figure 6 yes Figure 5 Cross-sectional view along line bb.

[0021] Figure 7 It is a schematic diagram of the structure of the panel.

[0022] Figure 8 It is a structural diagram of the stiffened slab.

[0023] Fig. 9 It is a structural diagram of the reinforcement plate.

[0024] In the figure: 1, 3 - panel 2 - middle ribs 41, 42, 43, 44 - ribs 5 - bottom plate 6 - diagonal support plate 7 - bottom support plate 8 - upper support plate 9 - vertical wall plate 10 - vertical rib plate 11 - reinforcement plate 12 - plug welding hole 13 - crack. DETAILED DESCRIPTION

[0025] The present invention is described in detail below in conjunction with the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0026] See Figure 5-Figure 9 , changing the structure of the ladle continuous casting arm, the modified ladle continuous casting arm includes symmetrically arranged panels 1, 3, and an intermediate rib plate 2 parallel to the panels 1, 3, the panels 1, 3 and the bottom of the intermediate rib plate 2 are welded and fixed by a bottom plate 5, rib plates 43, 44 are welded between the panels 1, 3 and the intermediate rib plate 2, the panels 1, 3, the upper support plate 8, the vertical wall plate 9, the oblique support plate 6, and the bottom support plate 7 are welded to form a cavity structure bent in the middle; vertical rib plates 10 are fixed on both sides of the intermediate rib plate 2, the upper and lower ends of the vertical rib plate 10 are welded to the rib plates 43, 44, and the sides of the vertical rib plate 10 are welded to the upper support plate 8, the vertical wall plate 9, the oblique support plate 6, and the bottom support plate 7; reinforcing plates 11 are welded on the outside of the panels 1, 3, and the welds of the rib plate 43 fixed on the upper end of the vertical rib plate 10 and the oblique support plate 6 and the bottom support plate 7 do not overlap.

[0027] A method for repairing a broken ladle continuous casting arm comprises the following steps:

[0028] 1) First install the work fence: confirm the work site and related parts, and reinforce and weld the fence and springboard to ensure the safety of personnel and equipment; draw a cordon on site, make safety signs, and keep strangers away;

[0029] 2) The longitudinal middle rib plate 2 and two transverse rib plates 43 and 44 are retained inside the ladle continuous casting arm, and the rest are removed. The rib plates 41 and 42 that are not easy to weld are cancelled, and the plug welding holes 12 on the panels 1 and 3 away from the groove are retained; two vertical rib plates 10 parallel to the middle rib plate 2 are added to improve the stress strength; the bottom support plate 7 is extended so that the weld between the bottom support plate 7 and the oblique support plate 6 does not overlap with the rib plate 43 installed on the plug welding hole 12, reducing welding and improving strength. Figure 5 A2 of the panel; and add reinforcement plate 11 on the outside of panels 1 and 3 to improve the structural strength; change the groove form of the weld at B1 to Figure 5 The k-type groove form at B2 shown improves the welding quality and thus improves the structural strength.

[0030] 3) The welding sequence is:

[0031] The first welded parts: the middle rib plate 2, the rib plate 43 installed on the plug welding hole 12, the diagonal support plate 6, the bottom support plate 7, the upper support plate 8, and the vertical wall plate 9; the second welded parts: the vertical rib plate 10; the third welded parts: the rib plate 44 arranged at the bottom of the vertical rib plate 10; the fourth welded parts: the bottom plate 5, the panels 1 and 3; the fifth welded parts: the reinforcing plate 11;

[0032] 4) Welding: Preheat to 80℃-100℃ before welding, use a baking gun for preheating, gas shielded welding, and use ER50-6 welding wire. Welding wire, preferably Welding wire; narrow-pass multi-layer welding, hammering to relieve stress during welding, carbon arc gouging to clean the weld root; grinding both sides of the weld after welding to remove spatter, rust and slag;

[0033] 5) Flaw detection: ultrasonic flaw detection is performed on the weld after welding. The flaw detection standard is GB / T11345-89 level II flaw detection, and the surface weld quality meets the requirements of JB / T5000.3 standard;

[0034] 6) Ensure the operation quality of each process, check the use of tools, welding equipment, gas, welding wire, etc. at any time, and replenish them in time without affecting the construction progress.

Claims

1. A method for repairing a broken ladle continuous casting arm, characterized in that: The ladle continuous casting arm comprises a symmetrically arranged panel, an intermediate rib plate parallel to the panel, the panel and the bottom of the intermediate rib plate are welded and fixed by a bottom plate, a rib plate is welded between the panel and the intermediate rib plate, and the panel, the upper support plate, the vertical wall plate, the oblique support plate, and the bottom support plate are welded to form a cavity structure bent in the middle; vertical rib plates are fixed on both sides of the intermediate rib plate, the upper and lower ends of the vertical rib plate are welded to the rib plate, and the side of the vertical rib plate is welded to the upper support plate, the vertical wall plate, the oblique support plate, and the bottom support plate; a reinforcing plate is welded on the outside of the panel, and the welds of the rib plate fixed on the upper end of the vertical rib plate and the oblique support plate and the bottom support plate do not overlap; the method for repairing the fracture of the ladle continuous casting arm comprises the following steps: 1) The longitudinal middle rib plate and two transverse rib plates are retained inside the ladle continuous casting arm, and the rest are removed. The plug welding holes on the panel away from the groove are retained, and the bottom support plate is extended so that the weld between the bottom support plate and the inclined support plate does not overlap with the rib plate installed on the plug welding hole to improve the strength; and a reinforcing plate is added on the outside of the panel to improve the structural strength; 2) Welding: The welding sequence is: The first welded parts: the middle rib plate, the rib plate installed on the plug welding hole, the diagonal support plate, the bottom support plate, the upper support plate, and the vertical wall plate; the second welded parts: the vertical rib plate; the third welded parts: the rib plate set at the bottom of the vertical rib plate; the fourth welded parts: the bottom plate and the panel; the fifth welded parts: the reinforcement plate; Welding process: preheating to 80℃-100℃ before welding, using a baking gun for preheating, gas shielded welding, ER50-6 welding wire, ø1.2-ø1.6mm welding wire; narrow-pass multi-layer welding, hammering to relieve stress during welding, carbon arc gouging to clean the weld root; grinding both sides of the weld after welding to remove spatter, rust and slag; 3) Flaw detection: After welding, the weld is subjected to ultrasonic flaw detection. The flaw detection standard is GB / T11345-89 Level II flaw detection, and the surface weld quality meets the requirements of JB / T5000.3 standard.

2. The method for repairing a broken ladle continuous casting arm according to claim 1, characterized in that: In step 3), the upper support plate and the vertical wall plate are welded in a K-type groove.

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