Welding repair method for large-sized heat-resistant steel castings
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A welding repair and heat-resistant steel technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve problems such as difficult to guarantee repair quality, lack of fusion, delayed cracks and slag inclusion, and achieve preheating and heat preservation. , Repair large-area defects and save economic losses
Active Publication Date: 2014-08-06
HARBIN JIANCHENG GRP
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[0003] The purpose of the present invention is to solve the problem of using the existing manual arc welding surfacing method to repair large castings. Due to the poor weldability of heat-resistant steel castings, complex defect positions and large workpieces, welding stress is difficult to eliminate, and it is easy to produce in the repair process. Defects of incomplete fusion, incomplete penetration, delayed cracks and slag inclusions, repair quality is difficult to guarantee, and then provide a welding repair method for large heat-resistant steel castings
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specific Embodiment approach 1
[0032] Embodiment 1: The large-scale heat-resistant steel casting welding repair method of the present invention is carried out according to the following steps,
[0033] Step 1. Defect removal
[0034] 1) First use the radial drill to drill the deep defect;
[0035] 2) Use carbon arc gouging to completely remove defects, and preheat the workpiece to 200-220°C before carbon arc gouging;
[0036] 3) Use an angle grinder and a straight grinder to grind off the hardened layer caused by carbon arc gouging, and smooth the bottom and edge corners of the groove to be repaired, and remove the rust and oil stains in the repaired welding area and its surroundings ;
[0037] Step two, heat treatment
[0038] The workpiece processed in step 1 is immediately sent to the car-type resistance furnace for stress-relief annealing treatment. The annealing temperature is 750 ° C ~ 770 ° C, the temperature is raised for 8 hours, and then the furnace is cooled to 200 ° C after holding for 5 hour...
specific Embodiment approach 2
[0065] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the annealing temperature in step 2 is 760°C. Other steps and parameters are the same as those in Embodiment 1.
specific Embodiment approach 3
[0066] Embodiment 3: This embodiment differs from Embodiment 1 to Embodiment 2 in that: in step 5, the entire workpiece is preheated to 320° C. before welding. Partial preheating is generally used for large workpieces, and the overall preheating is difficult, and the overall preheating effect is good, which is conducive to the welding of the workpieces. Other steps and parameters are the same as those of the specific implementation modes 1 to 2.
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Abstract
The invention relates to a welding repair method for large-sized heat-resistant steel castings, and solves the problems that the welding stress is difficultly removed, the defects of incomplete fusion, incomplete penetration, delayed crack and slag inclusion are easily caused in a repair process and the repair quality is difficultly guaranteed as the heat-resistant steel castings are poorer in welding performance, complicated in defect position and large in workpiece in an existing manual arc welding type surfacing welding mode for repairing large-sized castings. The method mainly comprises the following steps: 1, removing the defects; 2, performing heat treatment; 3, performing dye check; 4, performing statistics on the repair welding quantity; 5, preheating before welding; 6, performing repair welding on defect parts; 7, cleaning and repairing; 8, performing post-welding heat treatment; 9, performing nondestructive inspection. According to the method, the large-area defects of the castings can be effectively repaired, the repair quality is guaranteed, the processing and use requirements of the castings can be met after repair, and the economic loss of scrapped important or major castings is reduced. The method is used for repairing the large-area defects of the large-sized heat-resistant steel castings.
Description
technical field [0001] The invention relates to a casting welding repair method, in particular to a large-scale heat-resistant steel casting large-area defect welding repair method. Background technique [0002] Large-scale castings often have defects such as trachoma, looseness and cracks in the process of casting and operation, and the loss of scrapping is huge. At present, manual arc welding is mostly used in China to repair them. The complex location of the repair and the size of the workpiece lead to difficulties in heat treatment and welding stress, which lead to defects such as lack of fusion, incomplete penetration, delayed cracks, and slag inclusions during the welding repair process, making it difficult to guarantee the repair quality. Contents of the invention [0003] The purpose of the present invention is to solve the problem of using the existing manual arc welding surfacing method to repair large castings. Due to the poor weldability of heat-resistant steel...
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Application Information
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