Thermal Characteristics of Weld and HAZ during Pulse Current Gas Metal Arc Weld Bead Deposition on HSLA Steel Plate

Devakumaran, K.; Ghosh, P. K.

doi:10.1080/10426910903229347

Cited by 30 publications

(15 citation statements)

References 16 publications

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“…The normal welding process, having different welding parameters, is basically stable, which makes it difficult to get characteristic signals that reflect upon the overall stability of the process. The approach to optimize the welding parameters so as to get the best combination to ensure a perfect welding process is now of concern in modern welding technology [8,9]. However, there does exist the need to evaluate the overall stability of the process using the appropriate criterion since the welding process is basically nonlinear.…”

Section: Introductionmentioning

confidence: 99%

An Analysis of Gas Metal Arc Welding Using the Lyapunov Exponent

Zhang

et al. 2013

Materials and Manufacturing Processes

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The characteristics of chaos are unique to the technique of gas metal arc welding (GMAW), which can be safely classified as being a nonlinear process. In this article, salient aspects relevant to the development and use of computational technique to accurately calculate the maximum Lyapunov exponent of the welding processes for different parameters is presented and discussed. The maximum Lyapunov exponent is then used to evaluate stability of the welding process while concurrently aiding in the selection of the welding parameters. Careful analysis of the results reveals overall chaos to exist in the gas metal arc welding process for the different droplet transfer modes. Overall stability of the welding process is related to the chaos that is generated and exists. The maximum Lyapunov exponent can be safely used as a valid criterion for evaluating the stability of the welding process. This aids in the selection of an optimized welding parameter for the welding process to form a weld bead that has both quality and integrity.

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Section: Introductionmentioning

confidence: 99%

An Analysis of Gas Metal Arc Welding Using the Lyapunov Exponent

Zhang

et al. 2013

Materials and Manufacturing Processes

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“…In comparison to the conventional process, GMAW-P could reduce HAZ width, weld porosity and facilitate favourable weld microstructure and mechanical properties. 30,31 A recent study on single-pass GMAW-P of P91 steel showed a fair improvement of the weld chemistry and mechanical properties over the similar joints prepared using conventional GMAW. 32 A detailed investigation on multipass GMAW-P of 12 mm thick P91 steel is undertaken in the present work.…”

Section: Introductionmentioning

confidence: 99%

Multipass pulsed current gas metal arc welding of P91 steel

Krishnan

Kulkarni

2016

Science and Technology of Welding and Joining

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Conventional gas metal arc welding of modified 9Cr-1Mo steels referred to as P91 steels is considered difficult due to loss of alloying elements and degradation of weld joint properties. In comparison to the conventional process, pulsed current gas metal arc welding allows more accurate control of heat input per unit length and electrode deposition and, thus, can be more suitable for the joining of P91 steel. A detailed experimental study is therefore undertaken to examine the roles of welding current, speed and groove angle in the weld bead profiles and joint properties in multipass pulsed current gas metal arc welding of 12 mm thick P91 steel. The results show that the joint properties are strongly influenced by the heat input per unit length and the groove angle. A groove angle of 758 and an appropriate choice of process conditions resulted in fairly acceptable bead profiles and joint properties.

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“…The weld arc light is a promising signal for the purpose of controlling the weld process. However, little attention had been given to (i) a careful diagnosis of the disturbance factors and (ii) overall quality of the weld in the welding process using an arc light spectral signal, for both the traditional gas metal arc welding (GMAW) and the more advanced pulsed GMA welding [11,12].…”

Section: Introductionmentioning

confidence: 99%

On the Use of Arc Radiation to Detect the Quality of Gas Metal Arc Welds

Srivatsan

Zhao

et al. 2011

Materials and Manufacturing Processes

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Gas metal arc (GMA) welding has over the years grown both in stature and strength to become a widely used welding process in the industries related to manufacturing. With sustained and noticeable developments in the technologies related to welding a need to automatically detect and even control the quality of welding has become both essential and desirable. Since defects present in the weld are mainly caused by an instability of the welding process, the overall quality of the welds can be detected from this instability. In order to detect the quality of the weld made by GMA welding, the arc light spectrum was collected and thoroughly analyzed and is the basis of presentation and discussion in this technical manuscript. The instability of the welding process is caused by either an improper selection and use of the welding parameters or the disturbance factors that are introduced during the welding process. Preliminary studies have shown that radiation of arc light comprised of spectral zones each having different characteristic. Some zones were abundant in the line spectra of elements (to include metal and the shielding gas argon), while some other zones were lacking in line spectra. Based on this, the spectral zones for detecting the welding process were selected. A chosen spectral zone lacking in a characteristic signal that revealed different transfer modes for the weld droplet for different arc lengths was carefully analyzed. With the introduction of disturbance factors in the welding process the resultant spectral signal of the welding arc was collected for the purpose of studying and resultant analysis. Results revealed the different disturbances to have a unique signal characteristic in the different spectral zones.

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Thermal Characteristics of Weld and HAZ during Pulse Current Gas Metal Arc Weld Bead Deposition on HSLA Steel Plate

Cited by 30 publications

References 16 publications

An Analysis of Gas Metal Arc Welding Using the Lyapunov Exponent

An Analysis of Gas Metal Arc Welding Using the Lyapunov Exponent

Multipass pulsed current gas metal arc welding of P91 steel

On the Use of Arc Radiation to Detect the Quality of Gas Metal Arc Welds

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