Application of low-melting-point flux to large-power TIG welding joint protection

A low-melting-point, high-power technology, applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve the problems of deteriorating weld mechanical properties and corrosion resistance, high purity requirements of inert gas, and affecting the appearance of welds. Achieve good fluidity and slag removal, improve mechanical properties, and improve physical protection

Inactive Publication Date: 2015-06-17
TIANJIN UNIV
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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

[0020] 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.

[0021] Perform high-power TIG welding on two 12mm thick AISI 304 stainless steel plates, the welding power supply is directly connected 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% helium by volume and 90% by volume argon. Fix the flux spreading and recovery device behind the welding torch along the relative movement direction of the welding torch and the weldment. After the welding torch or the weldment moves to expose the high-temperature liquid molten pool area, the hig...

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PUM

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Abstract

The invention discloses an application of a low-melting-point flux to large-power TIG welding joint protection. The low-melting-point flux comprises, 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 potassium fluoborate and 3-5 parts of MnO. All the components are placed in a mortar to be fully and evenly ground, and the particle sizes of all the raw materials range from 200 meshes to 800 meshes. After covering a high-temperature solidified welding joint, the low-melting-point flux is molten and rapidly lubricates the welding joint, the surface of the welding joint is completely covered, a protective film is formed, in this way, the welding joint is prevented from being oxidized, the mechanical performance and corrosion resistance of the welding joint are improved, the formed welding joint is attractive, and it is only required that simple slag removal treatment is conducted after welding.

Description

[0001] This application is a divisional application for a low melting point flux suitable for high-power TIG welding seam protection. The application number of the original application is 2013102221786, and the original application date is June 5, 2013. Low melting point flux for power TIG welding seam protection. technical field [0002] The invention relates to welding technology, in particular to a preparation method of low-melting-point flux suitable for high-power TIG welding seam protection. Background technique [0003] 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 ve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/362B23K35/40B23K9/167
CPCB23K9/167B23K35/3601B23K35/362
Inventor 罗震冯梦楠李会军李洋赵春凤
Owner TIANJIN UNIV
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