Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (6): 1555-1562.doi: 10.13229/j.cnki.jdxbgxb.20221103

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Effect of flux on surface tension of liquid metal in welding pool

Chun-kai LI(),Yue DAI,Jia-xin WANG,Yu-fen GU,Yu SHI,Bao-long XI   

  1. State Key Laboratory of Advanced Processing and Reuse of Nonferrous Metals，Lanzhou University of Technology，Lanzhou 730050，China
  • Received:2022-08-26 Online:2024-06-01 Published:2024-07-23

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Abstract:

A dynamic measurement system of molten pool liquid metal surface tension was established based on the principle of weld pool oscillation. The effect of three typical oxide fluxes on the surface tension of the molten pool under the action of the TIG arc heat source was investigated. It was found that the introduction of oxides does not have a significant effect on overall arc temperature. However， it would cause the average surface tension temperature gradient of liquid metal in molten pool to change from negative to positive， and the surface tension temperature gradient of molten pool is related to the melting point of the oxide. The lower the oxide melting point， the larger the surface tension temperature gradient of the weld pool.

Key words: weld, surface tension of molten pool, weld pool temperature, weld pool oscillation frequency, overall arc temperature, flux

CLC Number: 

  • TG444

Fig.1

Sensing system of arc temperature"

Fig.2

Schematic diagram of arc airspace scanning"

Table 1

Characteristic parameter of ArⅡ spectral line"

波长λ/mm

特征强度

I/s-1

跃迁概率

A/s-1

统计权重

g

激发态能量

E/eV

458.982 8106.64E+07621.127
460.953 2327.89E+07821.143
465.793 0308.92E+07219.801
472.684 2785.80E+07419.762
473.594 9295.80E+07419.261 1

Fig.3

Dynamic measurement system of weld pool surface tension"

Fig.4

Variation of penetration depth and weld width with average welding current"

Fig.5

Spatial distribution characteristics of arc electron temperature"

Fig.6

Variation of the weld pool oscillation frequency with the average welding current"

Fig.7

Weld pool surface temperature cloud"

Fig.8

Overall temperature variation of weld pool surface at different current"

Fig.9

Variation of average melt pool surface temperature with welding current"

Fig.10

Variation of weld pool surface tension and density with the average temperature of the weld pool surface"

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