Cold welding and repairing technology of crankshaft cracks of large reciprocating compressor by manual argon arc welding
A compressor crankshaft, manual argon arc welding technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of high technical risk, major mechanical accidents of the crankshaft, low success rate, etc., and achieve simple process and repair technology reliable effect
Active Publication Date: 2010-12-01
SICHUAN LUTIANHUA
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Problems solved by technology
[0004] The present invention aims to solve the problems of high technical risk and low success rate in the repair of non-destructive defects such as cracks, wear, bending, and deformation of the crankshaft of a large reciprocating compressor, and the failure of the crankshaft due to thermal stress and thermal deformation of the traditional welding process is easy. Cause major mechanical accidents and other technical problems to provide a welding that can be completed at normal temperature; the process is simple; the weldment does not require preheating, welding, heat treatment, mechanical correction procedures and large supporting facilities; Economical and safe large-scale reciprocating compressor crankshaft crack manual argon arc welding cold welding repair technology
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[0035] The welding performance of the forged steel crankshaft made of 45# (or 42CrMo) must be considered in the repair of cracks in the crankshaft of large reciprocating compressors by manual argon arc welding. The principles of evaluating weldability mainly include two aspects: one is to evaluate the welding process The tendency of defects provides a basis for formulating a reasonable welding process. It is necessary to conduct a crack resistance test, that is, a test based on hot cracks and cold cracks to verify; the second is to evaluate whether the thermal stress generated by welding after the cracks are eliminated affects the performance of the workpiece And the requirements of harsh technical conditions, which are mainly verified by mechanical performance tests.
[0036] The material of the crankshaft is medium carbon steel, according to the formula for calculating the carbon equivalent of weldability recommended by the International Welding Society:
[0037] CE(IIW)=C+M...
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Abstract
The invention discloses a cold welding and repairing technology of crankshaft cracks of a large reciprocating compressor by manual argon arc welding and relates to the technical field of welding, aiming to solve the technical problems that the technical risk is high, the success rate is low, major mechanical accidents are easy to cause by thermal stress and thermal deformation of the traditional welding process, and the like when non-destroyed defects of cracks, abrasions, bending, deformation, and the like which are generated for a crankshaft of a large reciprocating compressor. The technology comprises the following steps of: clearing away crankshaft neck cracks to be repaired; adjusting the coaxiality and the parallel misalignment; evaluating the welding process; hoisting and positioning; marking lines to divide areas and welding for three times; detecting and controlling the deformation in the welding process; and grinding. The invention is suitable for the cold welding and repairing of crankshaft cracks of the large reciprocating compressor by manual argon arc welding.
Description
technical field [0001] The invention relates to the field of welding technology, in particular to the cold welding repair technology of large equipment. Background technique [0002] At present, the treatment methods for crack defects in crankshaft journals of large reciprocating compressors are single and helpless. Superficial micro-cracks are generally equipped with corresponding small-sized bearings after grinding, or ground to relevant sizes after laser cladding, but the prerequisite is to ensure the strength of the crankshaft and not affect the technical indicators of assembly; for deep cracks, especially The deep cracks that appear on the crankshaft journal and the R where it borders the crank, because the crack propagation at this place will directly lead to the fracture of the crankshaft, so the customary treatment method is basically to discard and not replace the qualified spare parts to restore the original function of the machine, and there are no spare parts Th...
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IPC IPC(8): B23P6/00B23K9/16B23K9/235
Inventor 李和春
Owner SICHUAN LUTIANHUA
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