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Low-melting point welding flux applicable to protection of high-power TIG (Tungsten Inert Gas) welding seam

A high-power, low-melting technology, used in welding media, welding equipment, welding equipment, etc., can solve problems such as deterioration of mechanical properties and corrosion resistance of welds, high purity requirements of inert gas, and impact on appearance of welds. To achieve good fluidity and slag removal, improve mechanical properties, improve the effect of physical protection

Inactive Publication Date: 2013-09-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, inert gas protection also has some shortcomings that are difficult to overcome: 1. The protection time is limited
The formation of the oxide layer not only greatly deteriorates the mechanical properties and corrosion resistance of the weld, but also affects the appearance of the weld.
2. High cost and serious waste
The purity of the inert gas used in the welding process is required to be high, and its quantity is proportional to the welding time. Therefore, when welding large-scale weldments, the amount of inert gas used is quite large and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Put each component into a mortar and grind thoroughly, and the particle size of all raw materials is between 200 mesh and 800 mesh. Sieve the ingredients according to the above ratio and particle size, mix thoroughly and add water glass (3%-5% of the mass of raw materials after mixing) for wet mixing, then use a granulator to granulate, and then granulate at 200-300°C Dry at low temperature before use.

[0020] Perform high-power TIG welding on two 12mm thick AISI304 stainless steel plates, the welding power supply is connected directly to the DC, the current is 680-700A, the voltage is 14-16V, the welding speed is 300-350mm / min, and the shielding gas is composed of 10% by volume of helium and 90% by volume argon. The flux spreading and recovery device is fixed behind the welding torch along the relative movement direction of the welding torch and the weldment. After the welding torch or the parts to be welded move to expose the high-temperature liquid molten po...

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Abstract

The invention discloses a low-melting point welding flux applicable to the protection of a high-power TIG (Tungsten Inert Gas) welding seam, which comprises the following main components in part by mass: 20-30 parts of Al2O3, 15-25 parts of TiO2, 10-15 parts of CaO, 10-15 parts of NaCl, 5-10 parts of MgO, 5-10 parts of V2O5, 3-5 parts of KBF and 3-5 parts of MnO; all the components are put into a mortar to be fully and uniformly ground; and the granularity of all materials is between 200-800 meshes. The low-melting point welding flux has the benefits that the low-melting point welding flux can be molten after being covered on the surface of the high-temperature solidified welding seam and quickly moisturized to the welding seam, and can be completely covered on the surface of the welding seam to form a protective film layer, so that the oxidation of the welding seam is prevented, and the mechanical property and the corrosion resistance of the welding seam are improved; and the welding seam is attractive in appearance after being formed and is subjected to simple slag removal after being welded.

Description

technical field [0001] The invention relates to welding technology, in particular to a low-melting-point flux suitable for high-power TIG welding seam protection. Background technique [0002] At present, the welded structure is developing towards large-scale, high-parameter, and precise size. High-efficiency, high-performance welding technology has greatly promoted the rapid development of my country's construction technology and steel industry. The high-power TIG welding method can significantly increase the melting speed of the welding material during thick plate welding by improving the deposition efficiency. The welding efficiency is very high and the welding quality is good. has unique advantages. However, when high-power TIG welding is used to weld carbon steel, stainless steel, titanium and titanium alloys, due to the high affinity between materials and oxygen, protective measures are often required to reduce the oxidation of weld metal. At present, the more common...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/362B23K35/40B23K9/16
Inventor 罗震冯梦楠李会军李洋赵春凤
Owner TIANJIN UNIV
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