The Experts below are selected from a list of 1608 Experts worldwide ranked by ideXlab platform

Richard Thomas Lermen - One of the best experts on this subject based on the ideXlab platform.

  • optimizing the parameters of tig mig mag hybrid welding on the geometry of Bead welding using the taguchi method
    Journal of Manufacturing and Materials Processing, 2017
    Co-Authors: Cristian Fin Schneider, Camila Pereira Lisboa, Rodrigo De Almeida Silva, Richard Thomas Lermen
    Abstract:

    The main aim of this work was to evaluate the influence and optimize the factors of the TIG-MIG/MAG hybrid welding process on the geometry of the weld Bead. An experimental design using the Taguchi methodology (robust design method) was used to conduct the experiments. The experiments were carried out according to an orthogonal matrix with 27 experiments, with three replicates each, totaling 81 test specimens. The factors (MIG/MAG shielding gas type, MIG/MAG voltage, MIG/MAG wire feed, gas flow rate of TIG, electric current intensity of TIG and welding speed) were varied with three levels each. Penetration, heat-affected zone (HAZ), Bead width and Bead Height were the response variables analyzed. The results showed that the penetration was significantly influenced by the MIG/MAG wire feed, MIG/MAG shielding gas type, MIG/MAG voltage and welding speed. The HAZ has been influenced by MIG/MAG voltage, MIG/MAG shielding gas type, welding speed and electric current intensity of TIG. All factors had effects on the width, except the MIG/MAG wire feed. The Bead Height was significantly influenced by the MIG/MAG wire feed and by the electric current intensity of TIG. Optimizing the process was performed, so that for each output variable, the values of the factors that should be used were indicated, and the optimization was confirmed by welding test specimens.

  • Optimizing the Parameters of TIG-MIG/MAG Hybrid Welding on the Geometry of Bead Welding Using the Taguchi Method
    MDPI AG, 2017
    Co-Authors: Cristian Fin Schneider, Camila Pereira Lisboa, Rodrigo De Almeida Silva, Richard Thomas Lermen
    Abstract:

    The main aim of this work was to evaluate the influence and optimize the factors of the TIG-MIG/MAG hybrid welding process on the geometry of the weld Bead. An experimental design using the Taguchi methodology (robust design method) was used to conduct the experiments. The experiments were carried out according to an orthogonal matrix with 27 experiments, with three replicates each, totaling 81 test specimens. The factors (MIG/MAG shielding gas type, MIG/MAG voltage, MIG/MAG wire feed, gas flow rate of TIG, electric current intensity of TIG and welding speed) were varied with three levels each. Penetration, heat-affected zone (HAZ), Bead width and Bead Height were the response variables analyzed. The results showed that the penetration was significantly influenced by the MIG/MAG wire feed, MIG/MAG shielding gas type, MIG/MAG voltage and welding speed. The HAZ has been influenced by MIG/MAG voltage, MIG/MAG shielding gas type, welding speed and electric current intensity of TIG. All factors had effects on the width, except the MIG/MAG wire feed. The Bead Height was significantly influenced by the MIG/MAG wire feed and by the electric current intensity of TIG. Optimizing the process was performed, so that for each output variable, the values of the factors that should be used were indicated, and the optimization was confirmed by welding test specimens

Guangjun Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Online Control of Deposited Geometry of Multi-layer Multi-Bead Structure for Wire and Arc Additive Manufacturing
    Transactions on Intelligent Welding Manufacturing, 2018
    Co-Authors: Qinglin Han, Yongzhe Li, Guangjun Zhang
    Abstract:

    A robotic wire and arc additive manufacturing (WAAM) system with active vision sensing capability was implemented to improve the geometry accuracy of multi-layer multi-Bead structures. Width and Height of the deposited Bead were online detected and the accuracies of the designed sensing approaches are 0.25 mm and 0.1 mm, respectively. A double-input-double-output controller with two subsystems was designed to ensure the uniformity of Bead width and Bead Height. The Bead width was adjusted by a single neuron self-learning PI controller, while the Bead Height was controlled based on a rule-based engine. The experimental results indicated that (i) accuracy of the deposited Bead width is controlled in 0.5 mm, (ii) accumulation effect of the Bead Height deviations has disappeared when multiple layers are overlapped, and (iii) the surface finish of each layer was controlled to be flat as well.

  • Online measurement of Bead geometry in GMAW-based additive manufacturing using passive vision
    Measurement Science and Technology, 2013
    Co-Authors: Jun Xiong, Guangjun Zhang
    Abstract:

    Additive manufacturing based on gas metal arc welding is an advanced technique for depositing fully dense components with low cost. Despite this fact, techniques to achieve accurate control and automation of the process have not yet been perfectly developed. The online measurement of the deposited Bead geometry is a key problem for reliable control. In this work a passive vision-sensing system, comprising two cameras and composite filtering techniques, was proposed for real-time detection of the Bead Height and width through deposition of thin walls. The nozzle to the top surface distance was monitored for eliminating accumulated Height errors during the multi-layer deposition process. Various image processing algorithms were applied and discussed for extracting feature parameters. A calibration procedure was presented for the monitoring system. Validation experiments confirmed the effectiveness of the online measurement system for Bead geometry in layered additive manufacturing.

Pankaj Biswas - One of the best experts on this subject based on the ideXlab platform.

  • optimization and prediction of angular distortion and weldment characteristics of tig square butt joints
    Journal of Materials Engineering and Performance, 2014
    Co-Authors: H. K. Narang, Manas Mohan Mahapatra, Pankaj Biswas
    Abstract:

    Autogenous arc welds with minimum upper weld Bead depression and lower weld Bead bulging are desired as such welds do not require a second welding pass for filling up the upper Bead depressions (UBDs) and characterized with minimum angular distortion. The present paper describes optimization and prediction of angular distortion and weldment characteristics such as upper weld Bead depression and lower weld Bead bulging of TIG-welded structural steel square butt joints. Full factorial design of experiment was utilized for selecting the combinations of welding process parameter to produce the square butts. A mathematical model was developed to establish the relationship between TIG welding process parameters and responses such as upper Bead width, lower Bead width, UBD, lower Bead Height (bulging), weld cross-sectional area, and angular distortions. The optimal welding condition to minimize UBD and lower Bead bulging of the TIG butt joints was identified.

Cristian Fin Schneider - One of the best experts on this subject based on the ideXlab platform.

  • optimizing the parameters of tig mig mag hybrid welding on the geometry of Bead welding using the taguchi method
    Journal of Manufacturing and Materials Processing, 2017
    Co-Authors: Cristian Fin Schneider, Camila Pereira Lisboa, Rodrigo De Almeida Silva, Richard Thomas Lermen
    Abstract:

    The main aim of this work was to evaluate the influence and optimize the factors of the TIG-MIG/MAG hybrid welding process on the geometry of the weld Bead. An experimental design using the Taguchi methodology (robust design method) was used to conduct the experiments. The experiments were carried out according to an orthogonal matrix with 27 experiments, with three replicates each, totaling 81 test specimens. The factors (MIG/MAG shielding gas type, MIG/MAG voltage, MIG/MAG wire feed, gas flow rate of TIG, electric current intensity of TIG and welding speed) were varied with three levels each. Penetration, heat-affected zone (HAZ), Bead width and Bead Height were the response variables analyzed. The results showed that the penetration was significantly influenced by the MIG/MAG wire feed, MIG/MAG shielding gas type, MIG/MAG voltage and welding speed. The HAZ has been influenced by MIG/MAG voltage, MIG/MAG shielding gas type, welding speed and electric current intensity of TIG. All factors had effects on the width, except the MIG/MAG wire feed. The Bead Height was significantly influenced by the MIG/MAG wire feed and by the electric current intensity of TIG. Optimizing the process was performed, so that for each output variable, the values of the factors that should be used were indicated, and the optimization was confirmed by welding test specimens.

  • Optimizing the Parameters of TIG-MIG/MAG Hybrid Welding on the Geometry of Bead Welding Using the Taguchi Method
    MDPI AG, 2017
    Co-Authors: Cristian Fin Schneider, Camila Pereira Lisboa, Rodrigo De Almeida Silva, Richard Thomas Lermen
    Abstract:

    The main aim of this work was to evaluate the influence and optimize the factors of the TIG-MIG/MAG hybrid welding process on the geometry of the weld Bead. An experimental design using the Taguchi methodology (robust design method) was used to conduct the experiments. The experiments were carried out according to an orthogonal matrix with 27 experiments, with three replicates each, totaling 81 test specimens. The factors (MIG/MAG shielding gas type, MIG/MAG voltage, MIG/MAG wire feed, gas flow rate of TIG, electric current intensity of TIG and welding speed) were varied with three levels each. Penetration, heat-affected zone (HAZ), Bead width and Bead Height were the response variables analyzed. The results showed that the penetration was significantly influenced by the MIG/MAG wire feed, MIG/MAG shielding gas type, MIG/MAG voltage and welding speed. The HAZ has been influenced by MIG/MAG voltage, MIG/MAG shielding gas type, welding speed and electric current intensity of TIG. All factors had effects on the width, except the MIG/MAG wire feed. The Bead Height was significantly influenced by the MIG/MAG wire feed and by the electric current intensity of TIG. Optimizing the process was performed, so that for each output variable, the values of the factors that should be used were indicated, and the optimization was confirmed by welding test specimens

H. K. Narang - One of the best experts on this subject based on the ideXlab platform.

  • optimization and prediction of angular distortion and weldment characteristics of tig square butt joints
    Journal of Materials Engineering and Performance, 2014
    Co-Authors: H. K. Narang, Manas Mohan Mahapatra, Pankaj Biswas
    Abstract:

    Autogenous arc welds with minimum upper weld Bead depression and lower weld Bead bulging are desired as such welds do not require a second welding pass for filling up the upper Bead depressions (UBDs) and characterized with minimum angular distortion. The present paper describes optimization and prediction of angular distortion and weldment characteristics such as upper weld Bead depression and lower weld Bead bulging of TIG-welded structural steel square butt joints. Full factorial design of experiment was utilized for selecting the combinations of welding process parameter to produce the square butts. A mathematical model was developed to establish the relationship between TIG welding process parameters and responses such as upper Bead width, lower Bead width, UBD, lower Bead Height (bulging), weld cross-sectional area, and angular distortions. The optimal welding condition to minimize UBD and lower Bead bulging of the TIG butt joints was identified.