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Coupling-arc AA-TIG welding method

A welding method and arc technology, applied in arc welding equipment, welding equipment, welding rod characteristics, etc., can solve the problems of difficult angle and spacing adjustment, difficult welding automatic production, and low welding production efficiency, so as to prevent undercut or hump Welding bead, full automation, and the effect of increasing welding penetration

Inactive Publication Date: 2012-08-08
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, since the above method requires two processes or two welding torches during welding, the welding production efficiency is low, and it is difficult to be applied to automatic welding production. Problems such as difficult adjustment also limit the scope of application of this method

Method used

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  • Coupling-arc AA-TIG welding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The stainless steel plate is 8mm thick, and the welding speed is 500mm / min. The auxiliary arc parameters of coupled arc AA-TIG welding are shown in Table 1, and the main arc parameters are shown in Table 2.

[0018] Table 1 Auxiliary arc specification parameters

[0019]

[0020] Table 2 Main arc welding specification parameters

[0021]

[0022] Under the welding parameters in Table 1 and Table 2, the weld surface of coupled arc AA-TIG welding is as follows figure 2 As shown, the weld surface is well formed without any undercut. The shape of the weld seam section is as image 3 As shown, the weld penetration reached 3.5mm. The weld surface shape of coupled arc TIG welding without adding active gas is as follows: Figure 4 As shown, severe humps appear on the surface of the weld. The shape of the weld seam section is as Figure 5 As shown, the weld penetration is only 1.9mm. This shows that the addition of active gas in coupled arc AA-TIG welding can not ...

Embodiment 2

[0024] The stainless steel plate is 5mm thick, and the welding speed is 800mm / min. The test compared the weld surface and cross-sectional shape of conventional TIG welding, coupled arc TIG welding and coupled arc AA-TIG welding. The traditional TIG welding parameters are shown in Table 3, the coupled arc AA-TIG welding auxiliary arc welding parameters are shown in Table 4, and the main arc welding parameters are shown in Table 5. Figure 6 For traditional TIG welding, the weld surface and cross-section are shaped, and a hump bead appears on the weld surface. and Figure 7 and Figure 8 The weld surface of medium coupled arc TIG welding and coupled arc AA-TIG welding is well formed. The use of coupled arc TIG welding and coupled arc AA-TIG welding can significantly improve the shape of the weld surface.

[0025] Table 3 Specification parameters of traditional TIG welding

[0026]

[0027] Table 4 Auxiliary Arc Specification Parameters

[0028]

[0029] Table 5 Main ...

Embodiment 3

[0032] The stainless steel plate is 5mm thick, and the welding speed is 1800mm / min. The test compared traditional TIG welding, coupled arc TIG welding and coupled arc AA-TIG welding. The specification parameters of the auxiliary arc in coupled arc AA-TIG welding are shown in Table 7, and the specification parameters of the main arc welding are shown in Table 8. Figure 9 Shown are the weld surface and cross-sectional morphology of traditional TIG welding, and the weld surface has obvious hump bead. Figure 10 For coupled arc TIG welding, the surface and section of the weld seam are formed, the surface of the weld seam has a slight undercut, and the penetration depth of the weld seam is only 0.4mm. Figure 11 For coupled arc AA-TIG welding, the surface and cross-sectional morphology of the weld seam has no undercut on the surface, and the weld penetration depth reaches 0.6 mm. In comparison, it can be seen that the coupled arc AA-TIG welding has obviously better weld surface ...

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Abstract

The invention discloses a coupling-arc AA-TIG (argon arc-tungsten inert gas) welding method. Welding current induced into a main tungsten electrode is larger than welding current induced into an auxiliary tungsten electrode; protective gas passing through the auxiliary tungsten electrode is provided with an active element O; the main tungsten electrode adopts inert protective gas; a coupling arc is formed between the main tungsten electrode and the auxiliary tungsten electrode in a same welding gun, namely in the welding process, the two tungsten electrodes in the welding gun are arranged along the welding direction, the auxiliary tungsten electrode is arranged in the front and the main tungsten electrode at the back so as to form the coupling arc.

Description

technical field [0001] The present invention relates to active welding and high-speed welding methods. Background technique [0002] Argon tungsten arc welding is a kind of non-melting inert gas shielded welding. During the welding process, the heating zone always relies on the argon atmosphere to prevent the pollution of harmful substances in the atmosphere, thus ensuring the stability of the welding process and obtaining high Quality welds. However, this method still has obvious limitations, such as the single-pass weld penetration is shallow and the deposition rate is low; when welding thick plates, it is generally necessary to use a high-power welding power source or use some auxiliary processes, such as Preheating before welding, multi-layer multi-pass welding, double-sided simultaneous welding, etc. Therefore, for a long time, the research and development of new TIG welding methods and technologies that can make full use of the advantages of TIG welding and greatly i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/24
Inventor 樊丁黄勇王新鑫杨磊
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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