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Gas molten pool coupling active welding method

A welding method and gas technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems affecting the stability of welding process and welding production efficiency, increase equipment investment cost, increase heat input, etc. Automate welding production, improve welding efficiency, and increase the effect of penetration

Inactive Publication Date: 2011-08-17
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in practical applications, the first type of active TIG welding method requires the development of special active agent materials for different base metals, and a manual coating of active agent is added in the production process, which affects the stability and stability of the welding process. Welding production efficiency; in the second type of active TIG welding method, the content of active element O in the active gas must be strictly controlled when using active mixed gas welding, which requires a high-precision gas proportioner and high equipment costs, while using double-layer gas welding requires Using He gas as the inner layer shielding gas has high welding cost and poor practicability; the third type of active TIG welding method requires two arcs, which will lead to increased equipment investment costs and increased heat input, or welding efficiency is lower than that of the first type. Class II method

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this embodiment, the inner layer gas is Ar gas, the gas flow rate is 4L / min, and the outer layer gas is a single CO 2 Or Ar, the gas flow is 8L / min, the welding current is 160A, the welding speed is 120mm / min, the tungsten electrode extension length is 2mm, and the arc length is 2mm.

[0027] image 3 a is the outer gas is CO 2 , the weld morphology after coupling welding between gas and molten pool, in which the inner layer gas is Ar gas; image 3 b is the penetration depth of the weld when both the inner and outer layers are filled with Ar gas; image 3 c is the penetration depth of the weld when the inner layer only passes through the gas Ar, and there is no outer layer gas. Will image 3 a and image 3 b In comparison, it is confirmed that the outer layer gas containing active element O can couple with the molten pool metal and significantly increase the weld penetration; image 3 b and image 3 The penetration depth of c is almost the same, indicating tha...

Embodiment 2

[0029] In this embodiment, the inner layer gas is Ar gas, the gas flow rate is 4L / min, and the outer layer gas is N 2 and CO 2 The mixed gas, the gas flow rate is 10L / min, the welding current is 160A, the welding speed is 80mm / min, the tungsten electrode extension length is 3mm, and the arc length is 3mm.

[0030] Such as Figure 4 as shown, Figure 4 The outer gas in a is pure CO 2 , the weld penetration depth is 4.98mm, the fusion width is 9.64mm, and the aspect ratio is 0.52; Figure 4 The outer gas in b has 10% N added 2 , the weld penetration depth is 4.61mm, the fusion width is 8.42mm, and the aspect ratio is 0.55; Figure 4 The outer gas in c has 30% N added 2 , the weld penetration depth is 7.19mm, the fusion width is 9.31mm, and the aspect ratio is 0.77; Figure 4 The outer gas in d has 50% N added 2 , The weld penetration depth is 7.17mm, the fusion width is 8.66mm, and the aspect ratio is 0.83. In the welding process, after adding a certain proportion of O ...

Embodiment 4

[0032] In this embodiment, the inner layer gas is Ar gas, the gas flow rate is 4L / min, and the outer layer gas is a single N 2 or CO 2 , the gas flow rate is 10L / min, the welding current is 160A, the welding speed is 80mm / min, the tungsten electrode extension length is 3mm, and the arc length is 3mm.

[0033] Such as Figure 6 As shown, the impact energy of the weld metal and the base metal under different conditions were compared, and the comparison 1 and 2 confirmed that when a certain proportion of O was introduced, the impact toughness of the weld metal decreased significantly compared with the base metal; The impact energy of 2 and 3 is close, obviously higher than 1, indicating that adding a certain proportion of N element can improve the impact toughness of the weld.

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Abstract

The invention discloses a gas molten pool coupling active welding method and belongs to the field of active welding. An inner layer of gas and an outer layer of gas which are different are adopted during the welding process; the inner layer of gas relates to inert gas (Ar or He); and the outer layer of gas relates toN2+O2 mixed gas or N2+CO2 mixed gas. The outer layer of gas penetrates voltaic arcs and then is decomposed to generate element O and element N, and is coupled a the molten pool, thereby changing the floating state of metal in the molten pool and leading the metal to flow from the surface of the molten pool to the bottom part of the molten pool so as to realize the purpose of increasing the molten depth and simultaneously improving the impact toughness of welding seams. The intake volume of element O or element N can be coarsely adjusted by adjusting the flow of the outer layer of gas or the mixture ratio of the mixed gases, and can be finely adjusted by adjusting the coupling area (namely the coupling volume) between the outer layer of gas and the metal of the molten pool, thereby playing the role of precisely controlling the forming and quality of the welding seams.

Description

technical field [0001] The present invention relates to active soldering methods. Background technique [0002] Tungsten argon arc welding, namely TIG welding (Tungsten Inert Gas welding), is a kind of inert gas shielded welding widely used in modern industrial manufacturing. The plate thickness formed by one-shot welding is small, generally below 3mm. Activation welding technology can significantly increase welding penetration, improve welding efficiency, and overcome the shortcomings of traditional argon tungsten arc welding, which has attracted widespread attention worldwide, including PWI in Ukraine, EWI in the United States, TWI in the United Kingdom and JWRI in Japan The four major welding research institutes in China have carried out relevant research. Active TIG welding technology is represented by A-TIG welding (Activating flux TIG welding). By coating a thin layer of active agent on the surface of the test plate to be welded before conventional TIG welding, the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16
Inventor 黄勇刘瑞琳
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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