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

A technology of photothermal power generation and manufacturing method, which is applied in the field of welded pipe processing, can solve the problems of small bubbles in the crystallization line, unsatisfactory roughness, and easy mechanical damage, etc., and achieve excellent mechanical properties, good appearance and dimensional accuracy, and excellent corrosion performance Effect

Inactive Publication Date: 2018-07-06
ZHEJIANG JIULI HI TECH METALS
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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

Method used

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

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Embodiment

[0024] Steel type TP321, specification φ70*2.2mm, prepared by the following method:

[0025] 1) Coil forming: The roll arrangement and pass type in the existing forming technology are optimized, that is, the combination of seven flat and seven vertical rolls is used for online coil forming to ensure that the pipe is formed and the subsequent round straightening process There are no scratches and indentations on the surface, the quality of the forming seam is good, and a good forming effect can be obtained, laying a good foundation for the next welding process;

[0026] 2) Welding: Gas-shielded argon arc welding is used, and the welding torch shielding gas is 96% Ar 2 +4%H 2 , The shielding gas on the back of the weld is 100% Ar 2 , welding current 180-260A, welding voltage 9-15V, welding speed 300-800mm. This welding method can effectively control welding defects such as weld bubbles and inclusions, effectively improve the stability of the weld of austenitic stainless steel...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 李洁泉潘建兴吉海刘明洲董卫兵杨建军李先强
Owner ZHEJIANG JIULI HI TECH METALS
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