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Method for predicting small-angle welding temperature field of rotating arc low-alloy structural steel

A technology of rotating arc and welding temperature, applied in arc welding equipment, welding equipment, welding accessories, etc., can solve problems such as welding defects and losses, and achieve the effect of reducing experimental costs and workload

Inactive Publication Date: 2015-10-21
XIANGTAN UNIV
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Problems solved by technology

Due to its various advantages, rotary arc welding has been widely used in various industries. However, when rotating welding in other positions except flat welding, the liquid metal in the molten pool will be different from the flat welding under the action of external force, especially gravity. The direction of welding flows, and when the welding torch rotates to different welding positions, the force on the liquid metal in the molten pool has different effects on the formation of the weld, and it is constantly changing, resulting in some welding defects. some losses

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  • Method for predicting small-angle welding temperature field of rotating arc low-alloy structural steel
  • Method for predicting small-angle welding temperature field of rotating arc low-alloy structural steel
  • Method for predicting small-angle welding temperature field of rotating arc low-alloy structural steel

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Embodiment 1

[0033] Embodiments of the present invention are described in detail below: the welding method that the present invention adopts is rotating arc CO. 2 Welding, the temperature measurement method is to measure the temperature by punching holes on the back of the thermocouple. S355J2G3 low-alloy structural steel was selected as the experimental material. The solidus temperature of the material is 1440°C, the liquidus temperature is 1505°C, and the latent heat of phase change is 270000J / kg. The size of the weldment is 100mm×100mm×5mm. Use the PHOENIX300 welding machine made in Germany to carry out rotary arc CO on the base metal 2 Gas-shielded welding plate surfacing experiment, the thermal efficiency is 0.75, the welding slope is 5°, and the welding process parameters are shown in Table 1. The thermal cycle curve was measured by a platinum-rhodium 30-platinum-rhodium 6 thermocouple, and transmitted to a computer equipped with SYSYWELD software of the French ESI company through...

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Abstract

The invention relates to a method for predicting a small-angle welding temperature field of rotating arc low-alloy structural steel. The method comprises the steps that according to the welding conditions of the small-angle welding temperature field of the rotating arc low-alloy structural steel, an experiment board is selected, and welding thermal cycle parameters are measured through a thermocouple; a model is built and a mesh is divided for specific conditions; a model thermal boundary condition is determined; a rotating arc heat source model is calculated, the cross section state of the rotating arc heat source model is extracted and compared with the actually measured cross section, the error of the cross section state and the actually measured cross section is decreased through fine adjustment, the boundary conditions and the heat source model are applied to rotating arc low-alloy structural steel welding simulation analysis, the temperature field is calculated, the welding thermal cycle parameters are extracted, and prediction of the small-angle welding temperature field of the rotating arc low-alloy structural steel is completed. The numerical simulation technology based on a small number of process tests is adopted, quantitative analysis and simulation of the small-angle welding temperature field of the rotating arc low-alloy structural steel are achieved, the experiment cost and workloads are reduced, and a guiding significance is provided for development and application of rotating arc welding.

Description

technical field [0001] The invention belongs to the technical field of welding automatic control equipment, and in particular relates to a method for predicting the small-angle welding temperature field of rotating arc low-alloy structural steel. Background technique [0002] Welding production is an important processing link in modern industry, intelligent welding process control system is an important means to improve labor productivity, improve welding quality, and improve working conditions. Due to its various advantages, rotary arc welding has been widely used in various industries. However, when rotating welding in other positions except flat welding, the liquid metal in the molten pool will be different from the flat welding under the action of external force, especially gravity. The direction of welding flows, and when the welding torch rotates to different welding positions, the force on the liquid metal in the molten pool has different effects on the formation of t...

Claims

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Application Information

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IPC IPC(8): B23K9/16B23K9/32
CPCB23K9/16B23K9/32
Inventor 洪波王谦戴江平柳健
Owner XIANGTAN UNIV
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