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Deep-groove narrow-gap manual argon arc sealing welding method

A welding method and narrow gap technology, applied in manual argon arc sealing and sealing welding, manual argon arc sealing welding, can solve the problems of poor weld quality, incomplete penetration, incomplete fusion, etc., and achieve good welding quality and good weld bead The effect of small gaps and less filler metal

Active Publication Date: 2012-12-12
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a manual argon arc sealing welding method for deep grooves and narrow gaps to solve the problems of incomplete penetration, lack of fusion, bridging, and poor quality of welds that are prone to occur after existing manual argon arc sealing welding. Therefore, it can effectively solve the technical problem of deep and narrow groove root weld quality, and solve the welding efficiency problem of this type of sealing welding due to the reasonable layout of the weld bead and the adoption of suitable welding process parameters

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0029] Manual tungsten argon arc sealing welding of tube plate and heat exchange tube of a shell-and-tube heat exchanger

[0030] Such as figure 1 as shown,

[0031] The tube sheet 5 of the shell heat exchanger is made of Q245R, with a thickness of 34mm; the material of the heat exchange tube 6 is 20G, and the specification is φ38mm;

[0032] The specific sealing welding method of tube sheet and heat exchange tube is as follows:

[0033] 1) Preparation before welding: Select the diameter and shape of the ceramic nozzle of the welding torch according to the size and depth of the groove. The ceramic nozzle can extend into the groove and be about 10-12mm away from the root of the weld. In this embodiment, the model of the selected ceramic nozzle is : M10×45×6mm. In addition, it is also necessary to pay attention to the size of the magnetic mouth so as not to affect the operator’s line of sight.

[0034] Selection of tungsten electrode: thoriated tungsten WCe-20 with a diameter...

Embodiment 2

[0043] Manual tungsten argon arc sealing welding of tube plate and heat exchange tube of a shell-and-tube heat exchanger

[0044] The tube sheet 5 of the shell heat exchanger is made of Q245R, with a thickness of 38mm; the material of the heat exchange tube 6 is 20G, and the specification is φ43mm; the heat exchange tube 6 and the tube sheet 5 are welded vertically.

[0045] The specific sealing welding method of tube sheet and heat exchange tube is as follows:

[0046] 1) Preparation before welding: Select the diameter and shape of the ceramic nozzle of the welding torch according to the size and depth of the groove. The ceramic nozzle can extend into the groove and be 12mm away from the root of the weld. In this embodiment, the model of the selected ceramic nozzle is: M10× 45×6mm. In addition, it is also necessary to pay attention to the size of the magnetic mouth so as not to affect the operator's line of sight.

[0047] Selection of tungsten electrode: thoriated tungsten WC...

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Abstract

The invention discloses a deep-groove narrow-gap manual argon arc sealing welding method. The method comprises the following steps of: (1) cleaning before welding: removing oil, rust and water from welding areas, cleaning the welding areas and the peripheries of the welding areas by using acetone, and carrying out drying process by using hot air after washing; (2) forming a first weld bead for the root of a welding seam through sealing welding, carrying out self fluxing without wire filling by adopting manual tungsten argon-arc welding, and enabling the root of the welding seam to be of through welding by adopting the self fluxing current of 100-150 A and the self fluxing voltage of 14-20 V; (3) after self fluxing, carrying out transition by adopting small-diameter argon-arc welding wires through manual tungsten argon-arc welding, and forming a single transition layer for a single bead by adopting a discontinuous wire filling manner, the welding current of 40-60 A and the welding voltage of 12-16 V, thereby reaching welding fluxing; and (4) forming two weld beads in a transition manner by adopting conventional-diameter argon-arc welding wires through manual tungsten argon-arc welding, adopting a continuous wire filling manner, and welding multiple layers for a single bead until the welding is appropriate. The deep-groove narrow-gap manual argon arc sealing welding method disclosed by the invention has the advantages of simple steps, strong manual operability, high welding efficiency and good welded quality.

Description

technical field [0001] The invention relates to a manual argon arc sealing welding method, in particular to a manual argon arc sealing welding method when a tube plate and a heat exchange tube are welded with a deep and narrow groove, and belongs to the technical field of manual argon arc welding. [0002] Background technique [0003] Manual argon tungsten arc welding refers to the use of argon as a shielding gas, tungsten as an electrode and a heating source to weld ferrous and non-ferrous metals, so as to obtain high-quality welded joints; when welding, the tungsten does not melt. The transition problem of the electrode metal, the arc phenomenon is relatively simple, the reproducibility of the welding process is strong, and it is easy to operate. It is suitable for thin workpiece welding and thick workpiece argon arc welding bottom sealing, and other electric welding cover work. [0004] The diameters of commonly used welding wires for manual argon tungsten arc welding h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/235B23K35/04
Inventor 钟正彬刘洪张涛
Owner DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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