Mathematical model of complex weld penetration profile: A case of square AC waveform arc welding

2017 ◽  
Vol 30 ◽  
pp. 483-491 ◽  
Author(s):  
Sanatan Choudhury ◽  
Abhay Sharma ◽  
Uttam Kumar Mohanty ◽  
Ryu Kasai ◽  
Masaharu Komura ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Arc Welding ◽  
Weld Penetration ◽  
Penetration Profile

Development of Exothermic Flux for Enhanced Penetration in Submerged Arc Welding

2020 ◽  
Vol 19 (01) ◽  
pp. 131-146
Author(s):  
Aditya Kumar ◽  
Kulwant Singh
Keyword(s):  
Mathematical Model ◽  
Arc Welding ◽  
Welding Process ◽  
Submerged Arc Welding ◽  
Graphical Form ◽  
Welding Parameters ◽  
Weld Penetration ◽  
Agglomeration Process ◽  
Arc Welding Process ◽  
Submerged Arc

An exothermic flux for submerged arc welding process has been developed which is capable of enhancing weld penetration of the joint. For this purpose, thermit mixture in different proportions (20% and 40%) has been added to the parent flux by agglomeration process. Beads on plate were deposited using parent and developed exothermic fluxes for a comparative study. EH14 filler wires in combination with parent and exothermic fluxes were used in this investigation. The effects of welding parameters and exothermic flux on weld penetration were investigated and the results have been presented in this paper. It has been found that the penetration increases from 2.95 to 3.51[Formula: see text]mm with 40% thermit mixture addition to the parent flux. It is further observed that penetration increases with increase in the amount of thermit mixture added. A mathematical model has been developed to predict weld penetration or select suitable welding parameters to obtain the desired penetration. The significance of coefficients was tested using Student’s [Formula: see text]-test and the adequacy of developed model was tested using [Formula: see text]-test. The effects of various parameters on penetration have been presented in graphical form for better understanding.

Vision sensing and feedback control of weld penetration in helium arc welding process

2021 ◽  
Vol 72 ◽  
pp. 168-178
Author(s):  
Guodong Peng ◽  
Baohua Chang ◽  
Guoqing Wang ◽  
Yanjun Gao ◽  
Runshi Hou ◽  
...  
Keyword(s):  
Feedback Control ◽  
Arc Welding ◽  
Welding Process ◽  
Weld Penetration ◽  
Vision Sensing ◽  
Arc Welding Process

Closed-Loop Control of Weld Penetration Using Front-Face Vision Sensing

1993 ◽  
Vol 207 (1) ◽  
pp. 27-34 ◽  
Author(s):  
Y M Zhang ◽  
R Kovacevic ◽  
L Wu
Keyword(s):  
Arc Welding ◽  
Dynamic Modelling ◽  
Front Face ◽  
Weld Penetration ◽  
Loop Control ◽  
Vision Sensing ◽  
Gas Tungsten Arc ◽  
Full Penetration ◽  
Back Face ◽  
The Relationship

Feedback control of weld penetration based on a front-face sensor is a challenging problem in the field of welding. A novel vision-based approach is proposed in this paper for full penetration control of the gas tungsten arc welding (GT AW). Owing to the relationship between the front-face weld geometry and back-face weld width (representation of the full penetration state), which has been reported earlier by the present authors, it is possible to use the front-face geometry as feedback of full penetration. Based on the dynamic modelling and the analysis of accepted adaptive control algorithms, an adaptive predictive decoupling controller is developed. Simulations and experiments under a variety of welding conditions have been conducted to verify the effectiveness of the proposed approach and controller.

Study of the Effect of Active Fluxes in Gas Tungsten Arc Welding

2011 ◽  
Vol 189-193 ◽  
pp. 3579-3582
Author(s):  
Jian Hao ◽  
Zhen Luo ◽  
Xian Zheng Bu ◽  
Jian Wu Zhang
Keyword(s):  
Stainless Steel ◽  
Thin Layer ◽  
Arc Welding ◽  
Gas Tungsten Arc Welding ◽  
Steel Plates ◽  
Angular Distortion ◽  
Deep Penetration ◽  
Weld Penetration ◽  
Gas Tungsten Arc ◽  
Gas Tungsten

In order to investigate the effect of active fluxes on weld penetration, angular distortion and weld morphology in gas tungsten arc welding (GTAW), three types of oxide fluxes-CaO, TiO2and Al2O3-were used in the welding of 5mm think stainless steel plates. Those powders were applied through a thin layer of the flux to produce a bead on plate welds. The results showed that compared with conventional TIG welding, increased weld penetration and reduced angular distortion of the weld piece were obtained with the application of active fluxes. However, the weld morphology was not changed significantly when the powders were coated on the surface of steel. It was also found that each of the powders has a fittest range in penetration increment. Whether the rate of the coating run out of the range, the effects of these active fluxes on the increased weld penetration were not obvious. The CaO flux has a narrow effective range for deep penetration, while the Al2O3powder does have no effect on A-TIG penetration. The mechanism of those different performances has not been found out. According to the investment, the mechanism of active fluxes for the increased weld penetration and reduced angular distortion is related to the contraction of the arc.

Effect of Arc Current Ultrasonic-Frequency Pulsation on Underwater Wet Arc Welding Quality

2013 ◽  
Vol 763 ◽  
pp. 174-178 ◽  
Author(s):  
Jie Zhu ◽  
Jia Cheng Guo ◽  
Wei Wang ◽  
Jia You Wang
Keyword(s):  
Arc Welding ◽  
Axial Direction ◽  
Pulse Frequency ◽  
Ultrasonic Frequency ◽  
Weld Penetration ◽  
Welding Quality ◽  
Underwater Welding ◽  
Joint Properties ◽  
Ultrasonic Assisted ◽  
Arc Current

A novel process of ultrasonic-assisted underwater wet arc welding was proposed to improve the joint properties, a number of ultrasonic-assisted underwater welding experiments were then carried out, and the effects of pulse frequency on weld formation, joint hardness and microstructure were investigated. Experimental results show that the ultrasonic frequency pulsation of arc can improve weld penetration while reducing effectively the hardness of joint HAZ in the arc axial direction and refining the grain of microstructure, and the effects of which are related closely to the pulse frequency.

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