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Arc assisted activating gas tungsten arc welding method

A technology of argon tungsten arc welding and argon tungsten arc, applied in arc welding equipment, welding equipment, manufacturing tools, etc., can solve problems affecting the stability of welding process and welding automation

Inactive Publication Date: 2009-01-21
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, special activator materials need to be developed for different base metals, and an activator coating process is added in the production process. Usually, the activator coating is performed by manual brushing, which affects the welding process. Stability and welding automation

Method used

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  • Arc assisted activating gas tungsten arc welding method
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  • Arc assisted activating gas tungsten arc welding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] The thickness of the stainless steel plate is 10mm, and AA-TIG welding is carried out by single-arc welding process, that is, the welding process is divided into two processes. The first process uses active mixed gas as the shielding gas, and pre-melts the surface of the bead to be welded with a small current tungsten arc. , the second process is TIG welding. The protective gases are active mixed gas oxygen + argon and carbon dioxide + argon respectively, and the purity of oxygen, carbon dioxide and argon is 99.9%. The specification parameters of small current tungsten arc are shown in Table 1, and the welding specifications of TIG welding are shown in Table 2.

[0011] Table 1 Specification parameters of small current argon tungsten arc

[0012]

[0013] Two active mixed gases of oxygen + argon and carbon dioxide + argon were respectively used as protective gases, and the surface of the bead to be welded was pre-melted by a low-current tungsten argon arc with the s...

Embodiment 2

[0015] AA-TIG welding is performed using a single arc welding process. Carbon dioxide + argon is used as the active mixed protective gas, in which the purity of carbon dioxide and argon is 99.9%, and the surface of the weld bead to be welded is pre-melted by a low-current tungsten argon arc with the specification parameters shown in Table 3. Then use the standard parameters shown in Table 4 to carry out TIG welding, which can penetrate a 10mm thick stainless steel plate at one time, realize single-sided welding and double-sided forming, the back reinforcement is less than 2mm, and the weld surface is well formed, such as Figure 4 , Figure 5 and Figure 6 shown. However, the cross-sectional appearance of the weld seam when conventional TIG welding is performed with the welding specification parameters shown in Table 4 is as follows: Figure 7 shown. Compared with conventional TIG welding, there is almost no change in the microstructure of the weld zone of AA-TIG welding, ...

Embodiment 3

[0019] Carbon dioxide + argon is used as the active mixed protective gas, and the purity of carbon dioxide and argon is 99.9%. The double-arc welding process is used for AA-TIG welding, that is, two TIG welding torches are arranged one behind the other, the former welding torch is used for low-current tungsten argon arc pre-melting treatment, and the latter welding torch is used for TIG welding. The distance between the two TIG torches is 25mm. The standard parameters of the low-current argon tungsten arc are shown in Table 1. The welding specification of TIG welding is the same as the welding speed of the low-current argon tungsten arc, which is 125mm min -1 Except, the rest of the specification parameters are the same as those in Table 2. When welding, two welding torches work at the same time, and the appearance of the welding arc is as follows: Figure 8 shown.

[0020] When double-arc AA-TIG welding is performed under such welding specifications, the surface morphology...

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Abstract

The invention discloses an argon porous tungsten-arc welding method that is assisted by arc, which is characterized in that the surface of a welding bead to be welded is premelted by small current tungsten arc, and active gas oxygen or the mixed gas of carbon dioxide and argon is taken as shielding gas, and argon tungsten-arc welding is carried out according to normal welding instructions after the solidification of a molten pool. Compare with A-TIG welding, due to no use of a surfactant and no surfactant coating process, the welding method of the invention can realize full automatic production, and has the advantages of more environmental protection, more efficiency, good process stability, high welding quality, etc.

Description

technical field [0001] The present invention relates to active soldering methods. Background technique [0002] The active welding method is a new welding technology with great development and application value. It has the outstanding characteristics of energy saving, environmental protection, high efficiency and high quality, and easy operation. It has attracted people's attention worldwide. The previous active welding method is to apply a thin layer of surfactant on the surface of the metal material to be welded, thereby causing the welding arc to shrink or the liquid metal flow state in the welding pool to change, so that the weld penetration depth is significantly increased, reaching the traditional welding. The method is more than 2 times, the welding efficiency is improved, and the electric energy is saved. The active welding method was first applied to tungsten argon arc welding (TIG welding), and the concept and process of A-TIG welding (Activating flux TIG Welding)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/235
Inventor 樊丁黄勇林涛
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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