Influence of Pulse Parameters on Characteristics of Bead-on-Plate Weld Deposits of Aluminum and Its Alloy in the Pulsed Gas Metal Arc Welding Process

Goyal, V.K.; Ghosh, P. K.; Saini, J.S.

doi:10.1007/s11661-008-9637-8

Cited by 23 publications

(5 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The welding arc changing periodically, the welding arc makes the heat input and the arc force to vary in alternating high and low, which cause the oscillation of the weld pool. The oscillation of the molten pool is beneficial to the spillover of the bubbles in the molten pool and the refinement of grains, thus improving the quality of the welded joint [24,25]. As soon as the varied weld pool size reaches a value where the intrinsic oscillation frequency of the weld pool is equal to the thermal frequency of DP-GMAW, the weld pool will be in resonance, with the pool oscillation amplitude reaching the maximum and the fusion zone obtaining the most refinement grain.…”

Section: Microstructures Of the Welded Jointsmentioning

confidence: 99%

Effects of Thermal Frequency on Microstructures, Mechanical and Corrosion Properties of AA6061 Joints

et al. 2018

View full text Add to dashboard Cite

Three thermal frequencies that were designated as 3, 4, and 5 Hz were used to reveal the microstructural evolution, mechanical, and corrosion properties of AA6061-T6 sheets that were welded by double pulsed gas metal arc welding (DP-GMAW) using microstructural observations, microhardness tests, tensile tests, bend tests, impact tests, and corrosion tests. A self-developed welding system consisted of a digital multifunctional welder and an arc dynamic waveform wavelet analyzer was chosen to perform welding operations and to record electrical signal waveforms during the welding process. The results show that the process of DP-GMAW was stable, and the weld beads exhibited aesthetic ripples. The ripple distance, the grain size, and porosity of the fusion zone decreased with an increasing thermal frequency. Microhardness and corrosion properties of the weld joint improved when the thermal frequency increased. In addition, all of the joints exhibited excellent bending properties. However, the impact property of the weld joint was lower than that of the BM. It indicated that the low impact energy results of the welded AA6061-T6 sheet were mainly due to the formation of micro-cracks in the fusion zone.

show abstract

Section: Microstructures Of the Welded Jointsmentioning

confidence: 99%

Effects of Thermal Frequency on Microstructures, Mechanical and Corrosion Properties of AA6061 Joints

et al. 2018

View full text Add to dashboard Cite

show abstract

“…where w and I eff are the effective melting potential at anode and effective current (root mean square value of the pulsed current wave form), respectively. The I eff is obtained [5,19,21] by the following expression:…”

Section: Experimentationmentioning

confidence: 99%

Assembling of thick-section HSLA steel with one seam per layer multi-pass PC-GMA welding producing superior quality

Agrawal

Ghosh

2017

J Braz. Soc. Mech. Sci. Eng.

View full text Add to dashboard Cite

Assembling of 25-mm-thick HSLA steel plate with extra narrow gap between the plates is done with the help of multi-pass one seam per layer pulse current gas metal arc welding process maintaining vertical weld deposition. Assembling of thick plates is also made using conventional groove with commonly used procedure of multi-pass multi-seam per layer weld deposition. Distortion and shrinkage that developed in the weld joints have been suitably determined. The effects of welding parameters in reference to weld thermal behavior on shrinkage stress and bending stress have been studied. The observations show that the use of one seam per layer technique allowing extra narrow gap welding with properly selected parameters can improve quality of weld joint with respect to distortion and stresses. The effect of pulse parameters on weld quality is studied, correlated and discussed. Cost benefits of applying such a welding technique have been justified with respect to consumption of less filler material and time for preparation of weld joint.

show abstract

“…d) Base current duration (tb): This is duration of maintenance of lower current level. e) Pulse frequency (f): Pulse frequency is the number of pulse current per second and can be found by the inverse of the cycle time, T in seconds [11].…”

Section: Parameters Of Pulse Current Gmawmentioning

confidence: 99%

Challenges in Application of Pulse Current Gas Metal Arc Welding Process for Preparation of Weld Joint with Superior Quality

Agrawal¹,

Kumar²

2016

IJERT

View full text Add to dashboard Cite

Quality of weld joint in the form of its mechanical and metallurgical properties produced using gas metal arc welding process is governed by combination of parameters employed. These parameters also affect arc stability, bead appearance and thermal and metal transfer behaviour. For a given shielding gas, diameter and composition of filler wire, different modes of metal transfer that can be achieved are short circuit, globular, spray and pulsed spray. The spray metal transfer provides better ease of operation due to controlled mode of it but at relatively higher welding current above transition level. This may give rise to increase in heat input and temperature of weld pool along with wider weld isotherm which may adversely affect quality weld joint. This problem to some extent can be minimized by pulsing of welding current resulting in application of comparatively lower heat input and temperature of weld pool. But application of pulse current gas metal arc welding involves additional pulse parameters of pulse current Ip, base current, Ib, pulse on time, tp and pulse off time tb simultaneously interacting in nature. Together, there can be infinite combination of possible parameters at a given heat input. Therefore, the major challenges in application of pulse current gas metal arc welding process are to select an appropriate combination of pulse parameters that will be able to produce a weld joint with superior quality. Considering all these, detail study of methods of selection of pulse parameters in pulsed current gas metal arc welding has been discussed.

show abstract

Influence of Pulse Parameters on Characteristics of Bead-on-Plate Weld Deposits of Aluminum and Its Alloy in the Pulsed Gas Metal Arc Welding Process

Cited by 23 publications

References 9 publications

Effects of Thermal Frequency on Microstructures, Mechanical and Corrosion Properties of AA6061 Joints

Effects of Thermal Frequency on Microstructures, Mechanical and Corrosion Properties of AA6061 Joints

Assembling of thick-section HSLA steel with one seam per layer multi-pass PC-GMA welding producing superior quality

Challenges in Application of Pulse Current Gas Metal Arc Welding Process for Preparation of Weld Joint with Superior Quality

Contact Info

Product

Resources

About