Thermal treatment process for weld of intermediate-diameter alloy pipeline

A weld joint and pipe technology, which is applied in the heat treatment process of alloy medium-diameter pipe weld joints, can solve the problems of low production efficiency, complex heat treatment process, and uneven welding quality, so as to improve work efficiency, avoid repetitive procedures, The effect of simple process method

Inactive Publication Date: 2016-06-01
CHONGQING YIMAN ENVIRONMENTAL PROTECTION EQUIP
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Problems solved by technology

[0002] At present, the heat treatment process of welded joints of alloy medium-diameter pipes is relatively complicated, and there is no unified specification and standard, resulting in uneven welding quality. Many repeated processes also make production efficiency low, increase the labor burden of workers, and make products The market competitiveness is not high
For some operators who have just entered the industry, there is no clear method and process, resulting in frequent mistakes and omissions during operation, and may even cause serious consequences

Method used

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Embodiment Construction

[0008] The technical solution disclosed in the present invention is a heat treatment process for the welding joint of alloy medium-diameter pipelines, which includes the following steps: 1) Preparation before welding: prepare thermal insulation cotton with a suitable size according to the welding joint specifications, wrap it with asbestos cloth, and sew it neatly , in order to facilitate wrapping the welding joint, the width of the insulation cotton on each side shall not be less than 5 times the thickness of the pipe wall, and shall be no less than 100mm larger than the installation width of the heater on each side;

[0009] 2) Preheating before welding: when heating, generally set the oxygen meter to 3-4MPa, and the acetylene meter to 0.05-0.1MPa, and adjust it according to the needs. During the heating process, the temperature must be uniform, and the temperature should be measured at any time. Absolutely not overheating, the heating time is about 3-5 minutes, when the temp...

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Abstract

The invention discloses a thermal treatment process for a weld of an intermediate-diameter alloy pipeline. The thermal treatment process is characterized in that the process includes the following steps of (1) preparation before welding, (2) preheating before welding and (3) welding; in the step of welding, firstly, thermocouples are symmetrically arranged on the two sides of the weld edge of the welded pipeline, when thermal treatment is carried out, a rectangular heating piece is unfolded and surrounds the weld for a circle, a 16# iron wire is used for binding the rectangular heating piece, and a heater is attached to the pipeline wall; secondly, as for the weld in the horizontal fixed position, the heat preservation thickness of the lower portion should be slightly larger than that of the upper portion, the temperature is increased to a heating temperature and is basically uniform, constant-temperature time starts to be calculated when the temperature difference is smaller than 50 DEG C, and in the cooling process, operation is conducted. The thermal treatment process is simple, multiple repeated procedures are omitted, and work efficiency is improved.

Description

technical field [0001] The invention relates to a heat treatment process for welding joints of alloy middle-diameter pipelines. Background technique [0002] At present, the heat treatment process of welded joints of alloy medium-diameter pipes is relatively complicated, and there is no unified specification and standard, resulting in uneven welding quality. Many repeated processes also make production efficiency low, increase the labor burden of workers, and make products market competitiveness is not high. For some operators who have just entered the industry, there is no clear method and process, resulting in frequent mistakes and omissions during operation, and may even cause serious consequences. Contents of the invention [0003] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a heat treatment process for the welding joint of the alloy medium-diameter pipeline. The heat treatment proc...

Claims

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Application Information

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IPC IPC(8): B23K31/02C21D9/50C21D9/08
Inventor 何永金
Owner CHONGQING YIMAN ENVIRONMENTAL PROTECTION EQUIP
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