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Large posted sides pipeline narrow gap tungsten electrode noble gas protecting all-position automatic soldering method

A tungsten inert gas, automatic welding technology, used in welding media, welding equipment, welding equipment and other directions, can solve the problems of large welding deposit metal filling, wide groove, long welding cycle, etc., to achieve high welding efficiency, The effect of small filling amount and short welding cycle

Active Publication Date: 2007-11-28
CHINA NUCLEAR IND 23 CONSTR
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] 2. The groove of the argon-electric combined welding process is wide, the filling amount of welding deposited metal is large, and the welding cycle is relatively long

Method used

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  • Large posted sides pipeline narrow gap tungsten electrode noble gas protecting all-position automatic soldering method
  • Large posted sides pipeline narrow gap tungsten electrode noble gas protecting all-position automatic soldering method
  • Large posted sides pipeline narrow gap tungsten electrode noble gas protecting all-position automatic soldering method

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and implementation examples.

[0030] For all-position automatic welding of narrow gaps in large-diameter thick-walled pipes with a wall thickness h above 40mm, the present invention is based on the traditional argon-electric combined welding process for welding the bevel of large thick-walled pipes, through repeated tests and improvements, The groove type and size suitable for the narrow gap automatic welding process of large thick-walled pipes are obtained, as shown in Figure 3. Compared with the groove of large thick-walled pipes welded by the traditional argon-electric combined welding process shown in Figure 1, this paper The width of the groove proposed by the invention is obviously narrowed, the maximum width of the groove is reduced to 18-24 mm, and the structural shape of the groove is also obviously changed.

[0031] Fig. 4 shows a schematic diagram of the speci...

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Abstract

The present invention relates to inert gas protected automatic narrow gap tungsten electrode welding process for large thick pipe with diameter over 325 mm and thickness over 40 mm. The automatic welding process includes forming combining chamfer in the opposite ends to be welded before welding, bottoming welding, single layer filling welding, and covering welding in linear or swinging weld pass. The process has less filled deposited metal, low welding cost, high welding efficiency and other advantages.

Description

technical field [0001] The invention relates to an all-position automatic welding method for a large thick-walled pipeline, in particular to an all-position automatic welding method using inert gas protection such as a narrow gap tungsten electrode for a large thick-walled pipeline. Background technique [0002] At present, there are mainly TIG gas-shielded welding process and MIG gas-shielded welding process at home and abroad, and these two processes are mainly used for welding small-diameter thin-walled pipes (pipe diameter φ<325mm, pipe wall thickness h <40mm=== welding. For large thick-walled pipes (pipe diameter φ ≥ 325mm, pipe wall thickness h ≥ 40mm) welding usually adopts the process of manual argon arc welding for bottoming and electrode arc filling and covering (hereinafter Argon-electric combined welding process for short), the groove types are mostly double "U"-shaped combined grooves, and the welding adopts single-layer multi-pass welding. The common weld...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K33/00B23K9/095B23K35/38B23K101/06
Inventor 范群喜徐建魁韩乃山苑占波张伟栋唐识
Owner CHINA NUCLEAR IND 23 CONSTR
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