A review on high-frequency pulsed arc welding

Wang, Zhenmin; Jiang, Donghang; Wu, Jianwen; Xu, Mengjia

doi:10.1016/j.jmapro.2020.10.054

Cited by 42 publications

(9 citation statements)

References 87 publications

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“…In the MIG welding method, the base current value enables the electrode to melt by ensuring the formation and continuity of the arc [5,133,134]. The peak current value also ensures the penetration of the melt droplet at the tip of the electrode into the workpiece [135]. In the TIG welding method, the peak current is generally selected to provide sufficient penetration, while the base current value is set at a level sufficient to maintain a constant arc [136].…”

Section: Pulsed Arc Currentmentioning

confidence: 99%

How to avoid solidification cracking in arc welding of aluminum alloys: a review on weld metal grain refinement approaches

Yolcu,

Kahraman

2023

Mater. Res. Express

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Joining aluminum alloys with arc welding methods is frequently subject to literature and industrial applications. Although aluminum alloys have different difficulties in the arc welded process, the formation and elimination of solidification cracking defects is a more complex phenomenon. Since avoidance of this defect requires specific approaches and methods, special attempts and improvements have been studied frequently on this subject in recent years. Studies in the literature have clearly shown that this defect, which is often encountered in aluminum alloys, takes place along the grain boundaries. Therefore, the major approach to eliminate this defect is activating nucleation and decreasing the grain size. In this context, modification approaches in the literature, which are frequently used for arc welding of aluminum alloys, have been developed to use three different mechanisms including heterogeneous nucleation, dendrite fragmentation, and grain detachment. While it is aimed to increase heterogeneous nucleation by reinforcing filler metals with compounds in the inoculation approach; dendrite fragmentation and grain detachment are also aimed in the approaches where external effects and forces are used. Within the frame of references, it is also possible to review the external factors aiming to improve weld pool convection and thermal conditions under two headings, which are weld pool stirring and pulsed arc current approaches. The weld pool stirring approach also includes ultrasonic treatment and magnetic arc oscillation methods. In this study, solidification cracking defect that frequently occurs in the arc welding of aluminum alloys is explained fundamentally and the attempts to eliminate this defect are presented as a review paper in a comprehensive manner.

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Section: Pulsed Arc Currentmentioning

confidence: 99%

How to avoid solidification cracking in arc welding of aluminum alloys: a review on weld metal grain refinement approaches

Yolcu,

Kahraman

2023

Mater. Res. Express

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“…The background current maintains the arc while the wire is melting and forming a droplet. The peak current is used to ensure that the molten droplet detaches from the ller wire [8,9] Comparative studies between CMT and conventional GMAW showed that the former has advantages over the second producing high quality weld beads with low heat input [10,11]. In addition, the application of CMT has been explored in welding of similar and dissimilar materials and in reparation of damaged pieces obtaining satisfactory results [5,4,[10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of AISI 1045 carbon steel plates weld overlay with EnDOTec DO15 using CMT and GMAW-P

Cortés-Rodríguez,

Ambriz,

López-Morelos

et al. 2024

Int J Adv Manuf Technol

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Cold metal transfer (CMT) and gas metal arc welding with pulsed current (GMAW-P) were used to apply a hardfacing layer on AISI 1045 steel plates with EnDOTec DO15 ller wire. Three conditions were studied for the plates with hardfacing; as welded (AW), annealed (ANN) after welding for minimum hardness and tempered heattreated (HT) after welding targeting hardness values of ~ 400 Vickers units. For the same metallurgical condition, there were no noticeable variation in the microhardness values despite the welding process used. The only difference found was the extent of the heat affected zone (HAZ) being smaller for the CMT process. The HAZ showed a re ned microstructure that was fully and partially reversed for the ANN and HT conditions, respectively.For the tensile tests of the EnDOTec DO15 ller material, the AW condition exhibited a brittle behavior. The highest yield strength values were obtained in the HT condition (1327.1 ± 34.5 MPa for GMAW-P and 1422.55 ± 9.65 MPa for CMT). The ANN condition showed yield strength values of 715.5 ± 3.3 MPa for GMAW-P and 719.88 ± 7.72 MPa for the CMT. Charpy impact tests were performed using weld cladded samples with the V-groove in two positions, over the hardfacing layer and over the AISI 1045 substrate. The specimens with the notch on the carbon steel plate recorded the highest values of absorbed energy for the three metallurgical conditions. The results proved that irrespective of the power source employed the mechanical properties of the weld overlay cladded plates are very good.

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“…Gas tungsten arc welding (GTAW), known for its advantages such as reduced spatter, a highly stable arc, high quality, and ease of automation [ 1 , 2 , 3 ], is widely used in additive manufacturing and surface repair [ 4 , 5 ]. Droplet transfer is critical in determining the weld quality [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

A Real-Time Monitoring Method for Droplet Transfer Frequency in Wire-Filled GTAW Based on Arc Sensing

Jia,

Luo,

Hong

et al. 2024

Sensors

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Droplet transfer frequency is a decisive factor in welding quality and efficiency in gas tungsten arc welding (GTAW). However, there still needs to be a monitoring method for droplet transfer frequency with high precision and good real-time performance. Therefore, a real-time monitoring method for droplet transfer frequency in wire-filled GTAW using arc sensing is proposed in this paper. An arc signal acquisition system is developed, and the wavelet filtering method filters out noise from the arc signal. An arc signal segmentation method—based on the OTSU algorithm and a feature extraction method for droplet transition based on density-based spatial clustering of applications with noise (DBSCAN)—is proposed to extract the feature signal of the droplet transition. A new conception of droplet transition uniformity is proposed, and it can be used to monitor the weld bead width uniformity. Numerous experiments for monitoring droplet transfer frequency in real time are conducted with typical welding parameters. This method enables the real-time observation of droplet transfer frequency, and the result shows that the average monitoring error is less than 0.05 Hz.

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A review on high-frequency pulsed arc welding

Cited by 42 publications

References 87 publications

How to avoid solidification cracking in arc welding of aluminum alloys: a review on weld metal grain refinement approaches

How to avoid solidification cracking in arc welding of aluminum alloys: a review on weld metal grain refinement approaches

Mechanical properties of AISI 1045 carbon steel plates weld overlay with EnDOTec DO15 using CMT and GMAW-P

A Real-Time Monitoring Method for Droplet Transfer Frequency in Wire-Filled GTAW Based on Arc Sensing

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