Manufacturing method of photo-thermal power generation and heat collection and absorption temperature-resistant special alloy welding pipe

Abstract

The invention discloses a manufacturing method of a photo-thermal power generation and heat collection and absorption temperature-resistant special alloy welding pipe. The manufacturing method comprises the steps of plate rolling forming, welding, welding joint treatment, heat treatment, rounding and straightening, eddy current detection, water pressure testing, pickling and passivating, polishingand check of the external dimensions. The welding process is an argon arc welding, rough polishing and fine polishing combined process. The novel photo-thermal power generation and heat collection and absorption temperature-resistant special alloy welding pipe manufactured through the manufacturing method has good external dimensional accuracy, excellent mechanical property and excellent corrosion property, and the outer surface roughness of the photo-thermal power generation and heat collection and absorption temperature-resistant special alloy welding pipe meets the requirement for fine polishing.

Description

technical field [0001] The invention belongs to the technical field of welded pipe processing, and in particular relates to a method for manufacturing a special alloy welded pipe for photothermal power generation, heat collection and heat absorption and temperature resistance. Background technique [0002] Photothermal power generation heat collection and heat-absorbing heat-resistant special alloy welded tubes are the core components of solar power generation, a new type of environmentally friendly power generation equipment, which undertakes the function of absorbing solar heat and transferring energy through the medium to achieve power generation. Due to its special service environment and working nature, this product has high technical requirements in all aspects, and it is difficult to develop and produce, as follows: [0003] The exterior of the product is to be plated with a heat absorbing film, and the outer surface roughness is required to be Ra≤0.2μm. The working ...

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Problems solved by technology

[0004] Due to the above reasons, it is difficult for welded tubes produced by ordinary processes to meet the requirements of photoelectric tubes. The specific manifestations are as follows: the surface is prone to mechanical damage (such as scratches, pits, etc.), and the weld area, especially the crystal line, will have some For defects such as small bubbles, the surface roughness cannot meet the requirements of fine polishing to Ra≤0.2μm; its dimensional tolerance is difficult to meet the high-precision requirements of photoelectric cells; its residual stress is generally above 100MPa, which will occur in a higher temperature environment Great hidden danger

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