Method for intensifying explosion-proof pipes by induction fusion welding and surfacing subareas on fire-facing side of boiler pipeline

Abstract

The invention relates to the technical field of methods for intensifying explosion-proof pipes by induction fusion welding and surfacing subareas, in particular to a method for intensifying the explosion-proof pipes by induction fusion welding and surfacing subareas on the fire-facing side of a boiler pipeline. The method comprises the following steps of performing sand blasting roughening treatment on the surface of a pipe top area of a pipe bank by an automatic sand blasting machine; enabling the pipe top part to be automatically surfaced by plasma arc, wherein the thickness is about 2.5 mm; enabling deformation of the pipe bank to be strictly controlled and corrected by adopting a special tool; using the automatic sand blasting machine to carry out sand blasting treatment on the parts, except for the surfacing part of the pipe top of the pipe bank, of the surface; preparing a nickel-based self-fluxing alloy coating on the part, except the surfacing surface, of the surface of the pipe bank through flame spraying, wherein the thickness is about 0.5 mm; and performing high-frequency induction remelting on a sprayed coating, and determining the process parameters, such as power supply frequency, heating specific power, heating starting time and pipe bank moving speed of high-frequency induction remelting. The worry of pipe explosion of manufacturers can be avoided, the service life is basically equivalent to that of complete surfacing welding, the purpose of being safe to use can be achieved, and most enterprises including small and medium-sized enterprises can pay for the method.

Description

technical field [0001] The invention relates to the technical field of methods for strengthening explosion-proof pipes by induction welding and surfacing welding, in particular to a method for strengthening explosion-proof pipes by induction welding and surfacing welding of boiler pipes towards the fire side. Background technique [0002] With the accelerated implementation of the country's new energy development strategy, the domestic waste incineration power generation industry has developed rapidly in recent years. At present, the bottleneck problem restricting the technical development of waste incineration power generation is the serious high-temperature corrosion of the heating surface of the four tubes of the boiler. Frequently, the economic benefits are seriously affected, which greatly affects the development of the waste incineration power generation industry. [0003] Coating protection is the most effective protection method against high temperature corrosion. ...

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Problems solved by technology

[0004] Secondly, before and after the surfacing treatment of the pipe row, an automatic sandblasting machine is required to perform sandblasting operations on the surfacing welding of the pipe row. The existing sandblasting operation is: the worker holds the automatic sandblasting gun head on the pipe Sandblasting is performed on the tube row. Due to the large surfacing area of ​​the tube row, manual sandblasting by workers cannot achieve uniform sandblasting on the tube row surfacing area, which ultimately affects the quality of the tube row surfacing welding. Therefore, the present invention proposes a boiler pipe The method of strengthening the explosion-proof tube by induction welding and surfacing welding on the fire side is used to solve the above problems

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