High-temperature heating surface welded junction and fin weld seam post-welding heat treatment device and manufacturing method

Abstract

The invention relates to a high-temperature heating surface welded junction and fin weld seam post-welding heat treatment device and a manufacturing method, and belongs to the field of high-temperature heating surface welded junction and fin weld seam post-welding heat treatment. The heat treatment device comprises a temperature control thermocouple, a host control unit, heat insulation and preservation devices and an electromagnetic induction coil. The hot end of the temperature control thermocouple is arranged on a welded junction and fin weld seam, and the cold end of the temperature control thermocouple is connected with the host control unit. The electromagnetic induction coil is arranged above the heat insulation and preservation devices, arranged in the spiral line direction and connected with the host control unit. The heat insulation and preservation devices are arranged above and below the welded junction and fin weld seam. The invention further provides the manufacturing method of the high-temperature heating surface welded junction and fin weld seam post-welding heat treatment device. According to the heat treatment device and the manufacturing method, the heating device has the advantages that a heating part can be heated evenly, the residual stress of the weld seam is greatly reduced, and meanwhile the heating efficiency is improved.

Description

technical field [0001] The present invention relates to a device and a manufacturing method, in particular to a post-weld heat treatment device and manufacturing method for high-temperature heating surface welds and fin welds, which are used to solve the post-weld heat treatment operation of high-temperature heating surface welds and fin welds Difficult and uneven quality problems, provide a new device for heat treatment of high-alloy fins and tube-panel splicing site welds for 650°C and above ultra-supercritical units. Background technique [0002] With the increase of the capacity of thermal power units, a large number of 9Cr high-alloy steels (such as 10Cr9Mo1VNb) will be used in the high-temperature heating surface tube rows of supercritical thermal power units, and the finned tube panels made of this type of steel will inevitably be installed on the construction site. There are high-alloy welds and fin sealing welds. After welding such welds, post-weld heat treatment is...

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Problems solved by technology

The steps of the patented heat treatment process are: 1) Prepare the welding joint to be heat treated, calculate the outer diameter / wall thickness value, heating width value, and welding joint heating power value according to the pipe specification and heating coefficient, determine the number of induction coils, and determine Coil spacing; 2) To fix the thermocouple, wrap one thermocouple with iron wire at the far end beyond the insulation width, and fix it with a bandage near the seam; 3) Bind the weld joint, use hard insulation cotton to bind the thermocouple and Wrap the welding joints together and fix them with bandages; 4) Wrap the induction coil, wrap the induction coil on the outside of the insulation cotton, and adjust the coil spacing; 5) Input the heat treatment process parameters; 6) Start the induction heating device; 7) Slow down the welding joint Cool to room temperature, remove the external induction coil, insulation cotton and thermocouple, perform physical and chemical inspection and non-destructive testing; although the patented process is simple to operate, low in investment cost, high in production efficiency and energy-saving and environmentally friendly, it cannot meet the needs of use. It is difficult to ensure the temperature balance between each welding joint and fin after post-weld heat treatment; so it still has the above defects

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