Slope pipeline welding method

A welding method and pipeline technology, which are applied in welding equipment, welding accessories, characteristics of welding rods, etc., can solve the problems of low welding efficiency of single torch, cumbersome processing of asymmetric grooves, and high processing cost of grooves. Conducive to management and alignment, ensuring the effect of welding quality

Inactive Publication Date: 2020-08-07
CHENGDU XIONGGU JIASHI ELECTRICAL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problems to be solved by the present invention are: asymmetric groove processing is cumbersome, the groove processing cost is high, and the welding efficiency of a single welding torch is relatively low. The present invention provides a welding method for slope-ground pipelines that solves the above problems

Method used

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Embodiment

[0028] Embodiment: welding of pipelines in mountainous areas, the material is X70, and the specification is 1219×18.4. Beveling machine is used to process the pipe mouth to form a symmetrical UV composite bevel; the flexible intelligent pipe internal welding system is used to position and assemble the pipe mouth; use intermediate frequency heating or electric heating to assemble the pipe The mouth is preheated; the flexible intelligent pipeline internal welding system is used to complete the root welding of the weld, and the double torch pipeline welding system is used to complete the heat welding, filling and cover welding of the weld. The specific operation steps are:

[0029] Before the groove processing, clean the inner and outer surface of the steel pipe and the 150mm range on both sides. There should be no phosphorus, wear, rust, slag, grease, paint and other harmful substances that affect the welding quality. The nozzle and the 20mm range on both sides should be cleane...

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Abstract

The invention discloses a slope pipeline welding method. The problems that asymmetric groove machining is complex, the groove machining cost is high, and the single-welding-torch welding efficiency isrelatively low are solved. The slope pipeline welding method comprises the steps that after a pipe opening of a pipeline is pretreated, and the welding process sequentially includes root welding, filling welding and facing welding, and the slope pipeline welding method further comprises the step that for an upper edge and a lower edge formed after two grooves are assembled in the welding process,along with welding position changes, the arrangement of the staying time of a welding wire on the upper edge and the lower edge is changed. Due to adoption of symmetric UV composite grooves, comparedwith asymmetric grooves, field groove machining is simple, cost is low, and pipe opening managing and assembling are better facilitated; by adoption of asymmetric upper-lower groove welding edge staying time technology parameters, undercut and non-melting unfavorable influences caused by longitudinal welding are accurately controlled, and the welding quality of a welding line is guaranteed.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a method for welding pipelines on sloping ground. Background technique [0002] In recent years, with the development of oil and gas pipelines with large diameter, long distance, high strength and high pressure, welding is becoming more and more difficult, and the requirements for welding quality are also getting higher and higher. Relying on manual arc welding and flux-cored wire semi-automatic welding has been difficult to meet the requirements of pipeline welding. Automatic welding The welding process is completed by machinery and preset welding process parameters, which is less affected by human beings. The welding efficiency and first-time pass rate of welding are much higher than manual welding and semi-automatic welding. [0003] At present, the construction of large-slope pipelines in mountainous areas. Mainly rely on manual arc welding and flux-cored wire semi-automat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/067B23K9/133B23K9/28B23K9/32B23K101/06
CPCB23K9/067B23K9/133B23K9/16B23K9/28B23K9/32B23K2101/06
Inventor 牟坤刘锴周剑琴王学军先泽均秦小省任国清赢景戢增旭叶俊祥王建军
Owner CHENGDU XIONGGU JIASHI ELECTRICAL
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