Effect of vibration and hot-wire gas tungsten arc (GTA) on the geometric shape

Silwal, Bishal; Santangelo, Michalel

doi:10.1016/j.jmatprotec.2017.08.010

Cited by 49 publications

(18 citation statements)

References 14 publications

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“…A 3D CFD (Computational Fluid Dynamics) model was developed for weld pool geometry. A comparison was made for plate on bead welding between cold wire and hot wire TIG welding process for mild steel 16) .…”

mentioning

confidence: 99%

A Review on Twin Tungsten Inert Gas Welding Process Accompanied by Hot Wire Pulsed Power Source

Shah

Agrawal

2019

Journal of Welding and Joining

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Tungsten Inert Gas (TIG) welding process is used in the industry due to its positional suitability, good control over metallurgical and mechanical properties and weld integrity. It makes this process more suitable to weld the root pass in the piping industries. However, there is a remarkable limitation to increase the welding current beyond a certain limit in the conventional TIG welding process due to limited current carrying capacity of a single electrode and higher arc pressure. This limits its productivity. To combat it, Twin TIG (T-TIG) welding process is introduced where the two tungsten electrodes are present in one torch. The two separate and synchronized power sources are connected to the two electrodes. To increase the metal deposition rate, the hot filler wire is used because it reduces the requirement of heat from arc plasma. There is another advancement in the TIG welding process which incorporates pulsed power source assisted welding process to control weld bead geometry, microstructure and to weld dissimilar material. This paper presents the effect of parameters of T-TIG, hot wire, and pulsed current welding processes when performed separately. A novel welding set up is proposed to weld dissimilar material with weld integrity. This paper suggests that when these three techniques are used simultaneously by meticulous studies of their process parameters with automation, an outperformed technique can be evolved which multiples the individual advantages of the three processes.

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mentioning

confidence: 99%

A Review on Twin Tungsten Inert Gas Welding Process Accompanied by Hot Wire Pulsed Power Source

Shah

Agrawal

2019

Journal of Welding and Joining

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“…As mentioned earlier, the top surface of the weld pool is depressed deep by the arc pressure, and the deepest deformation lies at the surface right under the arc center, which is also exactly the place where the upward liquid flows intensively. Hence, it can be seen from Figure 2b and Figure 5c that the upward flow driven by droplet impingement gains the ability to break the constraint acted on the top surface by the surface tension and arc pressure [19]. Moreover, Chen et al [10] also indicated that the droplet impingement had the ability to elevate the reinforcement (Figure 5d).…”

Section: Formation Mechanism Of Reinforcementmentioning

confidence: 90%

“…Because the arc pressure obeys a Gaussian distribution, the regions adjacent the central plane are also depressed heavily and only slightly inferior to that in the central plane. These regions, however, gain far less intensive upward flow because of the limited effect of the impingement on the liquid adjacent to the central plane, and the adjacent liquid is not able to negate the surface tension [19] and remains at a low level. Hence, the interface of the sunken surface and the raised central reinforcement, namely the grooves, forms.…”

Section: Formation Mechanism Of Reinforcementmentioning

confidence: 99%

Profile Map of Weld Beads and Its Formation Mechanism in Gas Metal Arc Welding

Zhang

Xue

2019

Metals

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In order to investigate the profile map of weld beads and its formation mechanism in gas metal arc welding (GMAW), bead-on-plate welding was carried out with different average currents, and the dimensions of a weld bead were measured. The results show that the profile of weld beads can be divided into three stages according to the volume relationship between the melted filler metal and the weld pool. During the stages, the top surface of the reinforcement consisting of the central plane and the side plane mainly goes through inversed-U, W, V, and U shapes, which are mainly attributed to the change of flow pattern. Moreover, the role played by the bottom wall in determining the flow pattern and the resultant bead profile has been investigated as well. The experiment results show that with the bottom wall changing from the solid to the totally melted state, the role of redirecting, redistributing and bearing the molten metal played by the bottom wall gradually disappears. As a result, the side reinforcement is no longer covered by the liquid flowing backward. The top reinforcement is thoroughly collapsed when the width of the bottom reinforcement exceeds that of the top one by 1.1 mm.

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“…The same technique was applied by Silva et al [8] in a frequency of 1.25 Hz, the objective was joining high-strength steel pipes for the oil and gas industry, the author also showed the possibility of increasing productivity in root pass welding for an automated welding. Silwal and Santangelo [9] using frequencies around 16 Hz, reported a vibration in the filler metal that provided an extra force assisting in the transfer of the wire to the pool. In this case the authors used a drop transfer without the constant contact of the wire with the molten material as Chen et al [10] characterized in their study.…”

Section: Introductionmentioning

confidence: 99%

Keyhole GTAW with Dynamic Wire Feeding Applied to Orbital Welding of 304L SS Pipes

et al. 2019

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Currently, in the Brazilian Oil and Gas scenario the execution of welding processes for stainless steel consists mostly of manual applications, rendering hard any increase in productivity and repeatability. Therefore, the automation of this step allows several advances such as more reliable results, lower costs and healthier condition for welders. With the aim of developing automation for GTAW welding of these applications, experimental tests were carried out in a 304L stainless steel pipe laid out at 5G position. The samples were orbitally welded by GTAW with dynamic wire feeding process, using a robotic manipulator in two steps of 180º in vertical down progression. The welding parameters and the stable condition obtained are discussed and the weld pool behavior during the root pass was online monitored by HDR (High Dynamic Range) videography. It was possible to reach high welding speed in the root pass, 50 cm/min in a keyhole mode. The wire dynamic movement contributed to reach great process stability and robustness for all joint passes, from root to finishing. The macrographs and x-ray analysis did not indicate discontinuities as porosity nor lack of fusion.

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Effect of vibration and hot-wire gas tungsten arc (GTA) on the geometric shape

Cited by 49 publications

References 14 publications

A Review on Twin Tungsten Inert Gas Welding Process Accompanied by Hot Wire Pulsed Power Source

A Review on Twin Tungsten Inert Gas Welding Process Accompanied by Hot Wire Pulsed Power Source

Profile Map of Weld Beads and Its Formation Mechanism in Gas Metal Arc Welding

Keyhole GTAW with Dynamic Wire Feeding Applied to Orbital Welding of 304L SS Pipes

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