Welding technology for valve body circumferential weld

A welding process and valve body technology, applied in the field of submerged arc welding, can solve problems such as difficult manufacturing and difficult repair

Inactive Publication Date: 2017-06-23
嘉兴五洲阀门有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once the bolted connection ball valve is manufactured, once a manufacturing quality problem occurs, local adjustments can be made and it is easy to repair; while the fully welded ball valve is manufactured, it is difficult to repair when a manufacturing quality problem occurs, which is an irreversible process and relatively difficult to manufacture

Method used

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  • Welding technology for valve body circumferential weld
  • Welding technology for valve body circumferential weld
  • Welding technology for valve body circumferential weld

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Embodiment 1

[0041] refer to figure 1 As shown, the welding process of a valve body circumferential weld seam provided by the present invention is specifically one A thin wire, narrow gap groove valve body circumferential submerged arc welding process, comprising the following steps: Step S1: Select welding wire with a diameter of 0.6mm-2.6mm, while ordinary submerged arc welding and narrow gap submerged arc welding The diameter of the welding wire is generally ≥Φ4.0mm, preferably Φ1.6mm in the present invention, the purpose of which is to reduce the heat input per unit length of the circumferential weld. Step S2: Select a welding power source suitable for the welding wire described above, and select a Lincoln (DC600) welding power source suitable for small wires with a duty cycle of 100% to ensure the stability of the welding arc under the condition of continuous welding with small currents combustion. Step S3: Adjust the welding groove angle to 2.0°-4.5° and control the root gap to 10...

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Abstract

The invention provides a welding technology for valve body circumferential weld comprising following steps: selecting welding wire having diameter of 0.6mm to 2.6mm; selecting welding power supply suitable for the welding wire; adjusting welding groove angle from 2.0 DEG to 4.5 DEG and controlling the root gap between 10mm and 24mm; using copper rods with the diameter being 10 to 15mm as welding conducting rods; inserting flux hoppers and welding conducting rods into the grooves and finishing the welding of valve body circumferential welds. The technology of the invention can realize less fused metallization filling content in valve body circumferential welds and reduction in heat input for welds of unit length and the total heat input for welds; the influence of welding heat on valve body sealing performance is reduced; the welding quality and manufacturing quality of large-diameter all-welded pipeline ball valves are guaranteed; and finally the purpose of using domestic products to replace import products of large-diameter all-welded pipeline ball valves is realized.

Description

technical field [0001] This patent relates to the submerged arc welding of the ball valve circumferential seam of the all-welded pipeline, which can be used for the continuous welding of the ball valve circumferential seam, and belongs to the submerged arc welding technical field. Background technique [0002] Long-distance natural gas pipelines generally adopt the form of buried, and the valve body connected to it generally does not adopt the traditional bolted connection and sealing structure, but adopts a fully welded connection and sealing structure, mainly to reduce the long-term operation of the long-distance pipeline. leakage point, to ensure the safe operation of the long-distance pipeline for 30 years. [0003] All-welded pipeline ball valves are key equipment in natural gas pipeline engineering. Due to their relatively large diameter, relatively high pressure, relatively large equipment, and relatively high manufacturing difficulty, they all relied on imports from ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/18B23K9/028
CPCB23K9/18B23K9/0026B23K9/028
Inventor 陈星翰杨智问赵国新
Owner 嘉兴五洲阀门有限公司
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